Porsche 964 Resources - ZRG Classics

Buyer's Guide

What to know before purchasing a 964

Overview

The Porsche 964 (1989-1994) represents the first significant modernization of the 911 platform. While maintaining the classic air-cooled flat-six and rear-engine layout, the 964 added coil-spring suspension, power steering, ABS brakes, and available all-wheel drive (Carrera 4). The 3.6L engine produced 247-315 hp depending on variant. The 964 is often considered the last of the 'classic' 911s while offering more refinement than earlier models. Values have risen significantly as the air-cooled market has matured, making careful selection essential.

Quick Facts

Production 1989-1994

Total Produced ~63,000 worldwide

Price Range $50,000 - $200,000+

Best Years 1992-1994 (refined production, fewer early issues)

Model Variants

Carrera 2

1990-1994

Rear-wheel drive variant with 247 hp. Lighter and more pure driving experience than C4. The driver's choice.

Desirability: High

Carrera 4

1989-1994

All-wheel drive with sophisticated viscous coupling. Heavier but more stable. First year of 964 production.

Desirability: Medium

RS / RS America

1992-1994

Lightweight homologation specials. European RS had 260 hp, RS America was a stripped Carrera 2. Both are collectible.

Desirability: High

Turbo (965)

1991-1994

The iconic widebody with 3.3L (320 hp) or 3.6L (355 hp) turbocharged flat-six. Serious performance and serious maintenance.

Desirability: High

Targa / Cabriolet

1990-1994

Open-top variants. Targa has removable roof panel, Cabriolet is full convertible. Less rigid but popular.

Desirability: Medium

Pre-Purchase Inspection Checklist

Critical areas to examine before purchasing. Bring this checklist when viewing a 964.

Engine (Critical)

Oil Leaks Air-cooled 911s leak oil - some is normal. Check chain housings, valve covers, and case halves for excessive leaks. If bad: $1,000-4,000 depending on location
Timing Chain Tensioners The dual-row timing chains have spring-loaded tensioners. Listen for chain rattle on cold start. If bad: $2,000-4,000
Compression and Leak-down Have a compression and leak-down test performed. Should be within 5% across cylinders. If bad: Engine rebuild $15,000-30,000
DME and Fuel Injection Check for smooth idle and proper fuel mixture. The Bosch Motronic system is reliable but sensors fail. If bad: $500-2,000
Turbo System (965) Check for shaft play, boost leaks, and wastegate operation. K26/K27 turbos are expensive to rebuild. If bad: $3,000-6,000

Transmission & Drivetrain

G50 Transmission Test all gears. The G50 5-speed is robust but synchros can wear. Check for popping out of gear. If bad: $2,000-5,000 for rebuild
Clutch Test engagement - should be smooth and grab mid-travel. Clutch replacement is labor-intensive. If bad: $2,000-3,500
CV Joints Listen for clicking in turns. Check boot condition for tears. If bad: $500-1,000
AWD System (C4) Test for proper engagement. Check for differential noise. System adds complexity. If bad: $2,000-5,000

Suspension & Steering

Coilover Condition 964 introduced coil springs. Check for leaking shocks and worn bushings. If bad: $1,500-3,000
Power Steering Check for leaks from pump, rack, and lines. Listen for whining indicating low fluid. If bad: $800-2,000
Control Arm Bushings Front and rear bushings wear. Check for play and cracking. If bad: $600-1,500
Wheel Bearings Jack up each corner and check for play. Listen for grinding while driving. If bad: $400-800 per corner

Body & Electrical

Rust Inspection Check rocker panels, floor pans (especially under battery), and around windshield. Earlier cars rust more. If bad: $2,000-10,000+
Wiring Condition 964 uses biodegradable wire sheathing that rodents love. Check for damage. If bad: $1,000-5,000
Targa/Cabrio Seals Check for leaks and proper seal condition on open-top models. If bad: $500-1,500
HVAC System Climate control can be complex. Test all functions including A/C. If bad: $500-2,000

Pricing Guide

Prices as of 2026. Values vary by location, options, and market conditions.

Project Car

$35,000 - $60,000

Cars needing engine work or with significant issues. Still valuable due to air-cooled premiums.

Driver Quality

$60,000 - $90,000

Running and driving with some needs. Good entry point for air-cooled ownership.

Excellent

$90,000 - $140,000

Well-maintained Carrera 2 or C4 with documentation. Clean examples.

Concours / Collector

$140,000 - $250,000+

RS, RS America, or exceptional Turbo models. Low miles, fully documented.

Red Flags - Walk Away If...

Oil smoke indicating worn engine internals
Timing chain rattle on cold start
Unknown service history
Evidence of water damage or flooding
Structural rust in rockers or shock towers
Turbo models with boost control issues
Heavy modifications without documentation
Salvage or rebuilt title

What to Look For

Desirable features and options that add value:

Carrera 2 manual for purest driving experience
Complete service records from Porsche specialists
Recent major service (clutch, timing chains if needed)
Rust-free body, especially dry-climate cars
Original paint and interior
Sport seats option
Limited-slip differential
Books, tools, and documentation

Ownership Costs

Insurance $1,500-3,000/year

Annual Maintenance $2,000-5,000 for regular service

Common Repairs $1,500-4,000/year typical

Fuel Economy 16-22 MPG

Expert Tips

The 964 is the most affordable air-cooled 911 entry point currently
Carrera 2 is preferred by drivers, C4 is more forgiving in bad weather
Oil leaks are normal - excessive leaks are not. Learn the difference.
Find a Porsche specialist or independent shop that knows air-cooled cars
Factor in the cost of a pre-purchase inspection by an expert
RS America values have skyrocketed - verify authenticity carefully
The G50 transmission is robust and parts are available
Join Rennlist.com and Pelican Parts forums for excellent technical support
Budget for consumables like motor mounts and suspension bushings
A well-maintained 964 will last indefinitely with proper care

Common Issues

Known problems, symptoms, and solutions for the 964 platform

Oil Leaks (Chain Housing and Case Seams)

Advanced

Symptoms: Oil spots under car, oil on engine surfaces, visible seepage, low oil level, burning oil smell

The 964's M64 engine is notorious for oil leaks. The most common source is the chain housing gasket (timing chain cover), but oil also seeps from the case half seams, valve cover gaskets, oil cooler seals, and cam tower o-rings. While some seepage is considered normal for air-cooled engines, excessive leaks require attention.

Estimated Repair Costs

DIY $200-500

Shop $500-1200

Chain housings, valve covers, and cam towers common.

Common Fixes

Chain housing (timing cover) gasket replacement - most common leak
Case seam resealing requires engine removal
Valve cover gaskets - relatively accessible
Oil cooler hose and fitting inspection
Cam tower o-rings (requires cam housing removal)
Use correct Porsche sealant for case seams

Common Parts

Part	Part Number	Est. Price
Chain Housing Gasket Set	96410519501	$100-200
Valve Cover Gasket Set	96410593300	$50-100
Cam Tower Gasket	96410573900	$30-60

Sources: Pelican Parts, Rennlist

Dual-Mass Flywheel Failure

Advanced

Symptoms: Clutch chatter, vibration at idle in gear, rattling noise, difficulty engaging gears

The 964 was the first 911 to use a dual-mass flywheel (DMF) to smooth out the flat-six's inherent vibration. These flywheels have internal springs and dampers that wear out over time, causing chatter and vibration. A failed DMF can also damage the clutch and transmission input shaft bearing.

Estimated Repair Costs

DIY $800-1500

Shop $2000-3500

DMF failure requires trans removal. Convert to single mass optional.

Common Fixes

Replace dual-mass flywheel with OEM or single-mass conversion
Single-mass conversion popular but increases drivetrain NVH
Replace clutch and throw-out bearing at the same time
Inspect transmission input shaft bearing while apart
Consider lightweight flywheel for track use

Common Parts

Part	Part Number	Est. Price
Dual Mass Flywheel	96411401200	$800-1200
Single Mass Conversion	Various	$600-1000
Clutch Kit	96411691100	$400-700

Sources: Rennlist, Pelican Parts

Distributor and Ignition Problems

Advanced

Symptoms: Hard starting, misfires, rough running, stalling, no spark

The 964 uses twin distributors driven off the camshafts. The distributor caps, rotors, and internal components wear over time. The distributor drive gears (plastic in early cars) can strip. Moisture intrusion causes cap corrosion and misfires. The dual-distributor system is complex but essential for the engine's operation.

Estimated Repair Costs

DIY $200-400

Shop $400-800

DME trigger failure. Rebuilt units available.

Common Fixes

Replace distributor caps and rotors (quality Bosch parts)
Inspect and replace distributor drive gear if worn
Check and clean all ignition connections
Replace spark plug wires if original
Upgrade to brass distributor gear (if equipped with plastic)

Common Parts

Part	Part Number	Est. Price
Distributor (Rebuilt)	Various specialists	$300-600
Rotor	93060291600	$40-80
Distributor Cap	93060291800	$50-100

Sources: Pelican Parts, 911 Motorsport

Power Steering System Issues

Moderate

Symptoms: Whining pump, heavy steering, fluid leaks, lack of assist, groaning noise

The 964 was the first 911 with standard power steering. The hydraulic system includes a pump, rack, reservoir, and lines that all age. Power steering pump failure is common, as are leaks from the rack seals, high-pressure lines, and return lines. The fluid should be changed regularly.

Estimated Repair Costs

DIY $200-400

Shop $500-1000

Pump and rack leaks common.

Common Fixes

Power steering pump rebuild or replacement
Replace leaking high-pressure and return hoses
Rack seal replacement or rack rebuild
Fluid flush and fill (use correct Pentosin fluid)
Check and clean reservoir screen

Common Parts

Part	Part Number	Est. Price
Power Steering Pump	96434704007	$300-500
Steering Rack Seal Kit	Various	$80-150

Sources: Rennlist, Pelican Parts

G50 Transmission Synchro Wear

Advanced

Symptoms: Grinding when shifting, difficulty engaging gears, blocked shifts, gear pop-out

The 964 uses the Getrag G50 5-speed transmission. While generally robust, the synchros wear over time, especially second gear. Aggressive driving, improper fluid, and inadequate warm-up accelerate wear. A worn synchro will grind or block when trying to engage the affected gear.

Estimated Repair Costs

DIY $100-300

Shop $400-1500

Synchros wear (especially 2nd). Use correct GL-4 fluid.

Common Fixes

Regular transmission fluid changes (GL-4 or Swepco 201)
Synchro replacement during transmission rebuild
Proper shifting technique and full clutch engagement
Allow transmission to warm up before aggressive driving
Some owners run thicker fluid in worn transmissions

Common Parts

Part	Part Number	Est. Price
GL-4 Gear Oil (Swepco 201)	N/A	$40-80
Shift Coupler	96442407500	$30-60

Sources: Rennlist, Pelican Parts

Cylinder Head Stud Failures

Advanced

Symptoms: Oil leak at head, coolant seepage, compression loss, misfires

The M64 engine can develop head stud issues, particularly the through-bolts that secure the heads to the case. These studs can pull out or stretch, especially if the engine has been overheated or has had incorrect torque applied. This is more common on Turbo models due to higher cylinder pressures.

Estimated Repair Costs

DIY $800-1500

Shop $2500-5000

Head stud failures on early 964. Requires engine removal.

Common Fixes

Head stud inspection during any engine work
Proper torque procedure critical for reassembly
Helicoil repair for pulled threads (requires engine removal)
Through-bolt style studs can be replaced with Dilavar studs
Always use new hardware when reassembling

Common Parts

Part	Part Number	Est. Price
Head Stud Kit (Dilavar)	Various aftermarket	$400-700
Head Gasket Set	96410421500	$200-400

Sources: Pelican Parts, Rennlist

Air Conditioning System Problems

Easy

Symptoms: Weak cooling, no cold air, AC compressor noise, clutch not engaging

The 964's air conditioning system uses R-12 refrigerant (original) and is complex due to the mid-engine layout. Compressor failures, condenser leaks, and evaporator issues are common in older systems. Many have been converted to R-134a with varying success. The AC evaporator requires dashboard removal to replace.

Estimated Repair Costs

DIY $200-500

Shop $600-1500

R12 to R134a conversion common.

Common Fixes

R-134a conversion with proper components
Compressor replacement (denso or OEM)
Condenser inspection and replacement if leaking
Evaporator replacement (major labor, dashboard out)
Receiver-drier replacement with any major AC work
System leak test before recharging

Common Parts

Part	Part Number	Est. Price
AC Compressor	Various	$400-700
R134a Conversion Kit	Various	$100-200

Sources: Rennlist, Pelican Parts

Electrical System Problems

Moderate

Symptoms: Gauge failures, intermittent lights, dead dashboard, alarm issues, starting problems

The 964 introduced more electrical complexity than earlier 911s, and these systems age poorly. The DME relay is a common failure point, as are ground connections and the alarm/immobilizer system. Gauge clusters develop cold solder joints. Wiring in the engine bay becomes brittle from heat.

Estimated Repair Costs

DIY $100-300

Shop $300-700

DME and relay issues. Grounds important.

Common Fixes

DME relay replacement (common failure)
Clean and resecure ground connections
Gauge cluster solder repair
Alarm system bypass or repair
Inspect and repair brittle wiring in engine compartment
Central electric panel inspection

Common Parts

Part	Part Number	Est. Price
DME Relay	96461815100	$40-80
Fuel Pump Relay	Various	$30-60

Sources: Pelican Parts, Rennlist

Restoration Guides

Comprehensive guides for rebuilding and restoring your 964

Complete Suspension Refresh

Intermediate 12-16 hours $800-1,800

Full front and rear suspension rebuild for the 964, restoring proper handling to this torsion bar-equipped 911. Addresses worn bushings, shocks, and steering components common on 30+ year old examples.

Interval Every 60,000-80,000 miles or when handling degrades

Cost (DIY) $800-1,800

Labor 10-14 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Front Control Arm (Left)	96434101703	Lemforder, Meyle	$120-200
Front Control Arm (Right)	96434101803	Lemforder, Meyle	$120-200
Front Strut (Each)	96434301503	Bilstein B4, Koni	$150-300
Rear Shock Absorber (Each)	96433030300	Bilstein B4, Koni	$150-250
Front Control Arm Bushing Set	96434199100	URO, Elephant Racing	$80-150
Rear Trailing Arm Bushing (Each)	96433114105	Elephant Racing, URO	$40-80
Tie Rod End (Each)	93034703202	Lemforder, Meyle	$50-90
Sway Bar End Link (Front, Each)	96434306902	URO, aftermarket	$30-60
Ball Joint (Each)	96434153200	Lemforder, URO	$60-100
Spring Plate Bushing (Rear)	91133353100	Elephant Racing	$50-100

Tools Needed

Floor jack and jack stands rated for vehicle weight
19mm socket for lug bolts
18mm, 19mm, 21mm, 24mm sockets and wrenches
Pickle fork or ball joint separator
Spring compressor (if replacing springs)
Torque wrench (ft-lbs range)
Bearing/bushing press or large C-clamp
Penetrating oil (PB Blaster)
Alignment tool set (optional)
Breaker bar for stubborn fasteners

Procedure

Raise vehicle and support securely on jack stands under reinforced jacking points.
Remove all four wheels and set aside in safe location.
Begin with front suspension - disconnect sway bar end links (18mm).
Remove tie rod ends from steering knuckle using pickle fork.
Support the strut assembly before disconnecting from knuckle.
Remove strut pinch bolt and disconnect from knuckle.
From above, remove the three 13mm nuts holding strut top mount.
Remove strut assembly and replace with new unit or rebuild with new cartridge.
Mark and count turns on torsion bar adjusters for ride height reference.
Remove front control arms - note shim placement for camber settings.
Press out old bushings and press in new ones, or replace entire arms.
For rear suspension, remove trailing arm bolts and lower arms.
Replace trailing arm bushings using press - original bushings are rubber.
Spring plate bushings require removal of torsion bar cover plates.
Replace rear shock absorbers - access from wheel well opening.
Reassemble in reverse order, torquing all fasteners to spec.
Front control arm bolts: 63 ft-lbs (85 Nm) - tighten with weight on wheels.
Tie rod ends: 33 ft-lbs (45 Nm) with new cotter pins.
Install wheels and torque lug bolts to 96 ft-lbs (130 Nm).
Perform wheel alignment after completing all work.

Pro Tips

The 964 uses torsion bars front and rear - handle with care and note settings.
Elephant Racing makes excellent polyurethane upgrades for street/track use.
Original rubber bushings are adequate for street use with OEM handling feel.
Mark all adjustment points and count turns for ride height reference.
Consider Bilstein HD or Koni adjustables for improved handling.
Check CV boots while suspension is disassembled - common failure point.
The 964's power steering adds complexity - don't disturb hydraulic lines unless necessary.

⚠️ Warnings

Torsion bars are under significant tension - improper removal can cause injury.
The 964 weighs approximately 3,000 lbs - use appropriate jack stands.
Mark or photograph all adjustment settings before disassembly.
Some fasteners may require heat due to corrosion on 30+ year old cars.
Power steering fluid can damage paint - protect body panels.
Always tighten suspension fasteners with weight on wheels for proper bushing loading.

References

Rust Prevention and Repair

Intermediate to Advanced 8-40+ hours depending on severity $200-3,000+

Comprehensive guide to inspecting, preventing, and repairing rust on the 964. Covers common problem areas including rocker panels, floor pans, battery box, and suspension mounting points critical to this classic air-cooled 911.

Interval Annual inspection, repair as needed

Cost (DIY) $200-3,000+

Labor Varies significantly by extent of rust

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Rocker Panel (Left)	91150349100	Restoration Design	$400-800
Rocker Panel (Right)	91150349200	Restoration Design	$400-800
Floor Pan Repair Section	91150105300	Klokkerholm	$200-400
Battery Box	96461213100	Reproduction	$150-300
Kidney Area Repair Panel	91150115300	Restoration Design	$300-600
Jack Point Repair Section	Various	Restoration Design	$100-200
POR-15 Rust Preventive Coating	N/A	POR-15	$40-80
3M Underseal Rubberized Coating	N/A	3M	$15-25
Weld-Through Primer	N/A	Eastwood, 3M	$15-30
Body Seam Sealer	N/A	3M, Eastwood	$20-40

Tools Needed

Wire brush and wire wheel attachments
Angle grinder with cutting and grinding discs
MIG welder (minimum 140A recommended)
Body panel clamps and magnets
Aviation snips for sheet metal
Sandblaster or chemical rust remover
Seam sealer applicator gun
Body filler and spreaders
DA sander with various grit discs
Spray gun for primer and underseal
Safety equipment: welding helmet, gloves, respirator

Procedure

Thoroughly clean undercarriage with pressure washer to expose rust areas.
Raise vehicle and inspect all common rust locations systematically.
Check rocker panels by pressing firmly - soft spots indicate internal rust.
Inspect battery box area (front trunk) - acid damage is common here.
Examine floor pans from inside with carpet removed and from below.
Check kidney areas where front fenders meet body - debris traps moisture.
Inspect jack point reinforcements - critical structural areas.
Examine shock tower tops from inside engine compartment.
For surface rust: sand to bare metal, treat with rust converter, prime and seal.
For perforation rust: cut out affected area 1 inch beyond visible rust.
Treat surrounding metal with rust converter before patching.
Fabricate or purchase repair panels to fit openings.
Apply weld-through primer to mating surfaces.
Tack weld panels in place, checking fit frequently.
Finish weld using stitch welding to prevent warpage.
Grind welds smooth and apply seam sealer to all joints.
Treat interior surfaces with rust preventive (POR-15 or equivalent).
Apply rubberized underseal to exterior underbody surfaces.
Prime and paint repaired areas to match existing finish.
Apply cavity wax to all hollow sections for ongoing protection.

Pro Tips

The 964 is a unibody - structural rust must be properly repaired for safety.
Battery acid damage is common - inspect even if battery has been relocated.
Kidney area rust often starts invisibly and spreads - probe thoroughly.
Original factory underseal can trap moisture - remove damaged sections.
Quality reproduction panels are available from Restoration Design and others.
POR-15 requires proper surface preparation - follow instructions exactly.
Consider professional inspection before purchasing a 964 to assess rust severity.
Cars from coastal or salt-road areas require extra diligence.

⚠️ Warnings

Extensive rust repair can exceed the vehicle's value - assess carefully first.
Welding near fuel lines and tank requires proper safety precautions.
Improper structural repairs can affect crash safety - consult professionals if unsure.
MIG welding thin body panels requires skill to avoid burn-through.
Rust preventive coatings require proper ventilation and safety equipment.
Disconnect battery and fuel system before any welding operations.

References

Electrical System Restoration

Intermediate 4-16 hours depending on scope $150-800

Complete guide to diagnosing and restoring the 964's electrical system. Covers the DME relay, fuel pump relay, ground connections, gauge cluster repair, and wiring harness inspection critical to reliable operation.

Interval Inspect every 2-3 years, service as needed

Cost (DIY) $150-800

Labor 4-12 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
DME Relay	96461815100	Bosch replacement	$40-80
Fuel Pump Relay	91161510101	Bosch, URO	$30-60
Main Relay Board	96461510110	Rebuilt available	$200-400
Ground Wire Kit	Various	Custom fabrication	$50-100
Fuse Box Cover Gasket	96461215301	N/A	$20-40
Alternator (Rebuilt)	96460301502	Bosch rebuilt	$200-400
Battery Cable Set	Various	Custom fabrication	$80-150
Distributor Cap (Each)	93060291800	Bosch	$50-100
Rotor (Each)	93060291600	Bosch	$40-80
Gauge Cluster Capacitor Kit	N/A	Various suppliers	$30-60

Tools Needed

Digital multimeter with amp clamp
12V test light
Wire crimping tool set
Soldering iron and electronics solder
Heat shrink tubing assortment
Dielectric grease
Battery terminal cleaner
Small picks and probes for connectors
Wire strippers
Electrical contact cleaner
Torx and Phillips screwdrivers for interior panels

Procedure

Disconnect battery before any electrical work - negative terminal first.
Test battery condition - load test and check voltage (should be 12.6V resting).
Clean and tighten all battery connections with terminal cleaner.
Test alternator output - should be 13.8-14.4V at idle.
Locate the relay panel in the front trunk area (fuse/relay carrier).
Identify DME relay position - pull and inspect for melted contacts.
Test DME relay with multimeter - replace if any doubt (common failure).
Inspect fuel pump relay - listen for click when key turns on.
Check and clean all ground connections - critical for proper operation.
Main engine ground is at transmission - clean and retorque.
Secondary grounds on body should be cleaned to bare metal.
Inspect wiring harness for rodent damage (common on stored cars).
Check wiring in engine bay for heat damage and brittleness.
For gauge cluster issues, remove cluster (Torx screws from behind wheel).
Inspect and resolder cold solder joints on cluster circuit board.
Replace failed capacitors in cluster (common cause of gauge failure).
Test all lighting circuits - replace failed bulbs.
Inspect and clean multi-pin connectors throughout the vehicle.
Apply dielectric grease to all cleaned connections.
Reconnect battery and test all systems before closing up.

Pro Tips

The 964's DME relay is the most common cause of no-start conditions.
Keep a spare DME relay in the car - they can fail without warning.
Ground connections are critical - clean and protect with dielectric grease.
The gauge cluster capacitor kit is an inexpensive preventive repair.
Biodegradable wiring insulation attracts rodents - inspect stored cars carefully.
Consider upgrading to LED bulbs for instrument lighting - more reliable.
The 964 uses dual distributors - service both at the same time.
Document any wiring changes with photographs for future reference.

⚠️ Warnings

Always disconnect battery before working on electrical systems.
The 964 has airbags - wait 10 minutes after disconnecting battery before working near steering wheel.
Incorrect relay replacement can damage the DME computer.
Brittle wiring can crack when handled - be gentle with original harnesses.
Static electricity can damage electronic components - ground yourself.
Do not use excessive dielectric grease - it can attract dirt over time.

References

Interior Restoration

Intermediate 16-40 hours for complete restoration $500-3,000+

Comprehensive interior restoration guide for the 964. Covers leather seat repair, carpet replacement, door panel restoration, dashboard care, and HVAC system service to return the cabin to factory-fresh condition.

Interval As needed based on condition

Cost (DIY) $500-3,000+

Labor 12-30 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Leather Seat Cover Kit	Various by color	Leatherique, Alea Leather	$400-1,200
Carpet Set	Various by color	Autoloc, Specialty Automotive	$400-800
Door Panel Set	Various	Refurbished available	$300-600
Seat Foam Cushion	96452105100	Various	$150-300
Leather Conditioner/Dye Kit	N/A	Leatherique, Connolly	$50-120
Door Seal Kit (Complete)	Various	German OEM suppliers	$300-600
Shift Boot (Leather)	96442404903	Various	$60-120
E-Brake Boot (Leather)	96442404504	Various	$40-80
Sun Visor Set	96473103300	Refurbished	$100-200
HVAC Blower Motor	96457201101	Valeo, aftermarket	$150-300

Tools Needed

Trim panel removal tools (plastic pry bars)
Torx driver set (T20, T25, T30)
Hog ring pliers and hog rings
Heat gun for leather work
Leather cleaning brushes
Interior detailing brushes
Spray bottle for cleaning solutions
Seam roller for carpet installation
Steam cleaner (optional but helpful)
Rivet gun for door panels
Upholstery adhesive

Procedure

Remove seats by unbolting from floor (4 bolts per seat, 13mm).
Disconnect any electrical connectors for power seats or seat sensors.
Inspect seat leather condition - clean with quality leather cleaner first.
For worn leather: apply Leatherique or similar conditioner system.
For cracked/torn leather: professional reupholstery or cover kit replacement.
Remove hog rings to separate leather from foam for cover replacement.
Replace foam cushions if compressed or degraded.
Install new covers using hog rings at attachment points.
Remove door panels by removing screws behind handle pulls and popping clips.
Inspect door card backing - replace water barrier if damaged.
Clean or replace door panel fabric/leather as needed.
Remove old carpet by removing sill plates and seat bases.
Clean and treat floor pan with rust preventive if any bare metal.
Install new carpet kit, starting from rear and working forward.
Secure carpet with adhesive at edges and plastic retainers.
Clean dashboard with appropriate cleaner - avoid silicone products.
Treat leather steering wheel with conditioner.
Replace shift and e-brake boots if cracked or worn.
Service HVAC system - replace blower motor if noisy or weak.
Test all interior functions before final assembly.

Pro Tips

The 964 interior is well-made - often cleaning and conditioning is sufficient.
Leatherique's two-step system can revive severely dried leather.
Original colors may be difficult to match - consider full color change if needed.
The 964 uses supple leather that responds well to conditioning.
Door panel clips are fragile - have extras on hand before removal.
Steam cleaning is effective for carpet and fabric without chemicals.
Original floor mats are collectible - preserve if possible.
Sun visors often sag due to mirror weight - rebuild kits available.

⚠️ Warnings

Airbag-equipped cars require care when removing steering wheel components.
Power seat wiring carries significant current - disconnect battery first.
Leather dyes can stain surrounding surfaces - mask carefully.
Silicone-based products leave residue that interferes with future repairs.
Heat gun can damage leather if held too close - keep moving.
Some adhesives require ventilation - work in well-ventilated area.

References

Parts & Suppliers

Trusted sources for OEM, aftermarket, and used parts

OEM Featured

Pelican Parts

Extensive 964 catalog with tech articles. The go-to resource for air-cooled 911 parts.

Tech Articles OE Parts Air-Cooled

Free over $99

OEM

Porsche Classic

Genuine Porsche OEM and remanufactured classic parts.

Genuine Porsche Classic OEM

OEM

Suncoast Porsche Parts

Genuine Porsche parts at discounted prices.

Genuine Porsche Dealer Discount

OEM

FCP Euro

Lifetime replacement guarantee on all parts.

Lifetime Warranty OE Quality

Free over $49 Lifetime

Performance Featured

Elephant Racing

964 suspension specialists. Track-proven coilovers and handling upgrades.

Suspension Coilovers Track

Performance

Wevo

Shifters and drivetrain upgrades. Excellent short shifter kits.

Shifters Drivetrain Mounts

Performance

LN Engineering

Air-cooled engine components. Cylinders, pistons, and IMS solutions.

Engine Parts Cylinders Quality

Performance

Fabspeed

Performance exhaust systems and headers for 964.

Exhaust Headers Sound

General

Sierra Madre Collection

Complete Porsche parts inventory. Quality parts for all 911 generations.

Large Inventory Quality Parts

General

Stoddard Porsche Parts

Vintage Porsche specialists. Authentic and reproduction parts.

Restoration Authentic Parts

Specialist Featured

Rennsport Systems

Air-cooled 911 specialists. Engine rebuilds and performance builds.

Engine Rebuilds Air-Cooled

Specialist

Aase Sales

Porsche restoration parts and trim.

Restoration Trim Interior

Used/NOS Featured

Rennlist 964 Classifieds

Premier air-cooled 911 community marketplace.

964 Community Rare Parts

Used/NOS

911UK Classifieds

UK-based 911 marketplace. Good for Euro-spec parts.

UK/Euro Parts Community

Used/NOS

eBay Motors

Large selection of used and NOS 964 parts.

NOS Parts Wide Selection

Helpful Tools

Pelican Parts Tech Articles Comprehensive 964 DIY tech articles P101tv VIN Decoder Porsche VIN decoder and options codes

Torque Specifications

Factory torque values for common service items

Reference Sources

Engine

Component	Torque Spec	Notes
Engine Through-Bolt	37 ft-lbs (50 Nm)	Hold one end while torquing the other
Case Perimeter Nuts	18 ft-lbs (25 Nm)	-
Spark Plugs	18-22 ft-lbs (25-30 Nm)	Anti-seize recommended
Valve Cover Nuts	11 ft-lbs (15 Nm)	Diagonal pattern
Oil Drain Plug	37 ft-lbs (50 Nm)	Replace crush washer
Flywheel Bolts	66 ft-lbs (90 Nm) + 90°	Use new bolts
Chain Housing Bolts	17 ft-lbs (23 Nm)	-
Cylinder Air Guide	7 ft-lbs (10 Nm)	Install with aluminum washer
Oil Cooler Lines	33 ft-lbs (45 Nm)	Use new sealing washers
Oil Pressure Switch (Small)	33 ft-lbs (45 Nm)	-
Power Steering Pump Bolts	17 ft-lbs (25 Nm)	Dry torque

Suspension

Component	Torque Spec	Notes
Wheel Lug Bolts (M14)	96 ft-lbs (130 Nm)	Tighten in star pattern
Control Arm Bolts	63 ft-lbs (85 Nm)	Tighten with weight on wheels
Tie Rod End Nut	33 ft-lbs (45 Nm)	Use new cotter pin
Shock Absorber Top Nut	55 ft-lbs (75 Nm)	-
Torsion Bar Cover	34 ft-lbs (46 Nm)	-
Steering Wheel Nut	33 ft-lbs (45 Nm)	-

Brakes

Component	Torque Spec	Notes
Front Caliper Bolts	63 ft-lbs (85 Nm)	-
Rear Caliper Bolts	43 ft-lbs (58 Nm)	-
Brake Line Fittings	11-14 ft-lbs (15-19 Nm)	Do not overtighten
ABS Sensor Bolt	7 ft-lbs (10 Nm)	-

DIY Maintenance Guides

Step-by-step tutorials for common maintenance tasks

Oil Change

Easy 45 min $60-90

Complete oil and filter change procedure for the M64 air-cooled flat-six.

Interval Every 3,000-5,000 miles

Cost (DIY) $60-90

Tools Needed

21mm socket for drain plug
Oil filter wrench (various types may be needed)
Drain pan (3 gallon capacity)
Funnel with extension tube
Ramps or jack and jack stands

Procedure

Warm the engine for 2-3 minutes - oil flows better when warm.
Drive onto ramps or raise and support the car safely.
Locate the main oil drain plug on the bottom of the engine case.
Position large drain pan and remove the 21mm drain plug.
Allow oil to drain completely - 15-20 minutes for thorough drainage.
The 964 has a spin-on oil filter located in the engine compartment.
Access the filter from the engine bay - it's on the left side of the engine.
Using filter wrench, remove the old filter.
Apply fresh oil to the new filter's gasket.
Thread new filter on by hand until seated, then 3/4 turn more.
Replace the copper crush washer on the drain plug.
Reinstall drain plug and torque to 37 ft-lbs (50 Nm).
Add 10-11 quarts of 15W-50 or 20W-50 oil through the oil filler.
Start engine and check for leaks at drain and filter.
Let engine idle briefly, shut off, wait 3 minutes, check level.

Pro Tips

Air-cooled 911s have large oil capacity (10-11 quarts) for cooling.
Use quality 15W-50 or 20W-50 conventional or synthetic oil.
Check for oil leaks at valve covers and chain housings while working.
Some owners use Mobil 1 15W-50 or Brad Penn racing oil.

Brake Pad Replacement

Easy 1-2 hours $120-200

Front and rear brake pad replacement on the 964's four-piston calipers.

Interval Every 20,000-35,000 miles

Cost (DIY) $120-200

Tools Needed

19mm socket for lug bolts
7mm Allen socket
Flathead screwdriver
Brake piston spreader tool
Wire brush
Brake cleaner
Brake grease
Jack and jack stands

Procedure

Loosen lug bolts while the car is on the ground.
Raise and support the car safely on jack stands.
Remove wheel to access the caliper.
The 964 uses four-piston fixed calipers - pads slide out without removing caliper.
Remove the pad retaining pins (cross pins through the caliper).
Use a flathead screwdriver to push and slide the old pads out.
Inspect rotor for scoring, cracks, or minimum thickness markings.
Clean the caliper pad contact surfaces with brake cleaner.
Use the piston spreader tool to push all four pistons back evenly.
Apply brake grease to the back of new pads.
Slide new pads into the caliper, ensuring proper orientation.
Reinstall pad retaining pins.
Reinstall wheel and torque lug bolts to 96 ft-lbs (130 Nm).
Repeat for all corners.
Pump brake pedal until firm before driving.

Pro Tips

Four-piston calipers require all pistons pushed back evenly.
Open brake fluid reservoir before compressing pistons.
Use quality pads from Pagid, Hawk, or Porsche OEM.
Bed new pads with gradual stops - avoid hard braking for 100 miles.

Distributor Cap and Rotor

Easy 1 hour $80-150

Replace distributor caps and rotors on both dual distributors.

Interval Every 15,000-20,000 miles

Cost (DIY) $80-150

Tools Needed

Phillips screwdriver
Flathead screwdriver
Pliers for wire clips
New caps, rotors, and dust covers
Dielectric grease

Procedure

The 964 has two distributors - one for each cylinder bank (1-3-5 and 2-4-6).
Locate both distributors at the rear of the engine, driven off the camshafts.
Mark or photograph the spark plug wire positions before removal.
Remove the spark plug wires by pulling on the boots, not the wires.
Remove the distributor cap retaining clips or screws.
Lift off the old distributor cap.
Pull the old rotor straight off the distributor shaft.
Remove the dust cover (if equipped) beneath the rotor.
Install new dust cover.
Install new rotor - it only fits one way on the shaft.
Install new distributor cap and secure with clips/screws.
Apply dielectric grease to the inside of plug wire boots.
Reconnect spark plug wires in the correct order.
Repeat for the second distributor.
Start engine and verify smooth operation.

Pro Tips

Always use Bosch or OEM quality caps and rotors.
Note the firing order: 1-6-2-4-3-5 with cylinders numbered from front.
Inspect the distributor gear for wear while the cap is off.
Replace spark plug wires if they show cracking or corrosion.

Valve Adjustment

Intermediate 2-3 hours $20-40

Check and adjust valve clearances on the M64 flat-six engine.

Interval Every 15,000 miles

Cost (DIY) $20-40

Tools Needed

10mm socket for valve covers
Feeler gauge set (metric)
13mm wrench for locknut
8mm Allen for adjuster
24mm socket for crank pulley
Flashlight

Procedure

Engine must be cold - valves expand when hot, changing clearances.
Remove the valve covers on both cylinder banks (six 10mm nuts each).
Rotate engine to TDC on cylinder 1 using 24mm socket on crank pulley.
At TDC #1, both lobes on cylinder 1 point away from the valves.
Check intake clearance: 0.10mm (0.004in) cold.
Check exhaust clearance: 0.10mm (0.004in) cold.
To adjust: Loosen 13mm locknut, turn 8mm adjuster, retighten locknut.
Recheck clearance after tightening - locknut can shift adjustment.
Rotate engine 120° to next firing order cylinder.
Firing order is 1-6-2-4-3-5 - adjust in this sequence.
Check and adjust all 12 valves (6 intake, 6 exhaust).
Clean valve cover mating surfaces and install new gaskets.
Reinstall valve covers and torque to 11 ft-lbs (15 Nm).

Pro Tips

Slight drag on feeler gauge is correct - not too tight, not too loose.
Mark each valve as you adjust to track progress.
Cylinder 1 is at the front right (passenger side, front).
Too tight = burned valves; too loose = noisy, poor performance.

Community Resources

Popular YouTube channels, forums, and communities dedicated to the 964

Porsche 964 911

Buyer's Guide

Overview

Quick Facts

Model Variants

Carrera 2

Carrera 4

RS / RS America

Turbo (965)

Targa / Cabriolet

Pre-Purchase Inspection Checklist

Engine (Critical)

Transmission & Drivetrain

Suspension & Steering

Body & Electrical

Pricing Guide

Project Car

Driver Quality

Excellent

Concours / Collector

Red Flags - Walk Away If...

What to Look For

Ownership Costs

Expert Tips

Common Issues

Oil Leaks (Chain Housing and Case Seams)

Estimated Repair Costs

Common Fixes

Common Parts

Dual-Mass Flywheel Failure

Estimated Repair Costs

Common Fixes

Common Parts

Distributor and Ignition Problems

Estimated Repair Costs

Common Fixes

Common Parts

Power Steering System Issues

Estimated Repair Costs

Common Fixes

Common Parts

G50 Transmission Synchro Wear

Estimated Repair Costs

Common Fixes

Common Parts

Cylinder Head Stud Failures

Estimated Repair Costs

Common Fixes

Common Parts

Air Conditioning System Problems

Estimated Repair Costs

Common Fixes

Common Parts

Electrical System Problems

Estimated Repair Costs

Common Fixes

Common Parts

Restoration Guides

Complete Suspension Refresh

Parts List

Tools Needed

Procedure

Pro Tips

⚠️ Warnings

References

Rust Prevention and Repair

Parts List

Tools Needed

Procedure

Pro Tips

⚠️ Warnings

References

Electrical System Restoration

Parts List

Tools Needed

Procedure

Pro Tips

⚠️ Warnings

References

Interior Restoration