OE Match

Crankshaft Main Bushing Sleeve - Bushing VIII - STANDARD size

Fits:
Porsche 911 1965-77
Porsche 914-6 1970-72

Diagram ref no 25

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90110113803

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Ring gear and pinion shaft set. 7:31

Fits:
Porsche 911 1972-77 with 915 Gearbox

Diagram ref no 9

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91530291116

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This flywheel fit the 1984–1986 Porsche 911 (3.2 L / Motronic engines) using the 915 transmission. 

Fits:
Porsche 911 3.2L 1984 - 1986 (915 Gearbox)

Diagram ref no 3

The clutch flywheel purpose & function
A flywheel in general (for a manual-transmission car) has several critical roles:
•  Mass / inertia storage — It smooths out the pulses of the engine, aiding when cylinders fire and bridging the gaps between combustion events.
•  Clutch friction surface — The clutch disc presses against the flywheel, so the flywheel must have a suitable, stable friction surface.
•  Crank / sensor interface — In this case, because it is used with Motronic control, the flywheel provides trigger pulses (teeth or marks) used by the engine control (DME) to know crankshaft position or engine speed.
•  Balancing — It must be precisely balanced (often as part of the entire rotating assembly including crank, flywheel, clutch) to avoid vibration and stresses. If the flywheel is worn, warped, cracked, or misaligned, all of these functions are jeopardized (vibrations, clutch slippage, sensor error, etc.). 

Common failure modes / why / signs & symptoms
Because the flywheel is a high-stress rotating component, over time or under strain it is subject to wear, damage and failure. For this particular part and era, here are common issues:
•   Surface wear, scoring, glazing, heat spots on the friction surface: repeated clutch engagement or slipping can overheat zones, creating hard “spots” or cracks.
•   Cracks / fractures: under severe stress or impact, cracks can develop, especially around bolt holes or near sensor teeth.
•   Distortion (warpage): heat cycles may warp the flywheel face so it is no longer flat, causing uneven clutch engagement or chatter.
•   Sensor trigger damage: damage or wear to the trigger teeth or notches may make the engine control module misread crank position or lost signals.
•   Bolt failures / loosening: the 9 bolts attaching the flywheel to the crank are critical; if they stretch, loosen, or fail, misalignment or imbalance can result.
•   Imbalance / degradation of balancing: over time, if the mating surfaces or mountings shift or fatigue, the initial balance may be compromised, introducing vibration.
•   Oil contamination: if the rear main seal or other seals leak oil onto the friction surface, the clutch/flywheel interface becomes compromised (slippage, glazing).
•   Fatigue / wear of dowel pins or alignment features: if alignment dowels (or roll pins) degrade or are missing, mounting may be off, leading to misalignment. In a forum thread, a user found small roll pins (alignment inserts) that had come off the flywheel. 

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93010203301

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Oil thermostat. Fits to oil lines



Fits:
Porsche 911 1974-89

Click 'Zoom in' for large parts diagram.
Diagram Ref No 1.

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93010701701

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Syncro ring 3rd/4th gear, for 4 speed gearbox

Fits:
Porsche 911 Turbo 1975-88 4 speed

Diagram ref no 12.

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93030230300

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Single mass flywheel 'RS' type.



Fits:
Porsche 964 CUP
Porsche 997.2 TURBO / GT2 / GT2 RS M97.70 engine
Porsche 997.2 GT3 / GT3 RS 3.8L M97.77 engine
Porsche 997.2 GT3 RS 4.0 M97.74 engine

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96410223981

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Slide rail for timing chain, RIGHT.
This timing chain guide rail is a direct-fit replacement for Porsche 964 and 993 engines. It ensures the timing chain runs smoothly and stays properly aligned. Built to factory standards, it restores reliability and protects against wear or damage.

Fits:
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998

Diagram Ref No 16.

• Position: Mounted along the timing chain assembly inside the crankcase, alongside the chain tensioner and sprockets.
• Function: The guide rail runs parallel to the timing chain, keeping it on its correct path between the crankshaft sprocket and camshaft sprockets, while working in conjunction with the chain tensioner to maintain stability.

Over time, guide rails can degrade, crack, or lose their smooth surface due to constant chain contact and engine heat. A compromised rail risks chain misalignment, noisy operation, or even serious engine damage. Replacing restores factory accuracy and reliability, protecting your Porsche’s performance and longevity.

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96410503000

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Cylindrical roller bearing. 30 x 62 x 16.



Fits:
Porsche 993 1995-98

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Diagram ref no 22

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99911019200

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Cylindrical roller bearing. 30 x 62 x 16.



Fits:
Porsche 996 Turbo / GT2 2001-05
Porsche 997 Turbo / GT2 / GT2 RS 2007-11
Porsche 996 GT3 1999-05
Porsche 997 GT3 2007-11

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Diagram ref no 56

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99911019200

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Cylindrical roller bearing. 25 x 52 x 15.



Fits:
Porsche 997 Turbo / GT2 / GT2 RS 2007-11
Porsche 997 GT3 / GT3 RS 2007-11

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Diagram ref no 23

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99911019401

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Cylindrical roller bearing. 25 x 52 x 15.



Fits:
Porsche 993 1995-98

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Diagram ref no 23

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99911019401

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Drive shaft sealing ring, 58 x 81.2 x 5. REAR INNER SEALING RING
This seal fits around the rotating shaft or axle interface (typically within the rear wheel hub or drive-axle assembly) to keep lubricant contained and prevent dirt, moisture, and debris from entering. Its exact fit and high-quality materials ensure optimal lubrication, minimize wear, and extend the life of surrounding bearings and gears.

Fits:
Porsche 911 (930) Turbo 1975 - 1989

Diagram ref no 12.

• Dimension: Designed to replace the factory shaft or wheel hub seal (measuring 58 × 81.2 × 5 mm)
• Position: Rear wheel hub / drive-shaft bearing interface
• Benefit: Superior fit and sealing durability to maintain lubrication and protect drivetrain bearings and gears.

With time, heat, constant rotation, and oil exposure can cause the seal material to harden or crack. Once compromised, it allows lubricant to leak and contaminants to enter, leading to excessive bearing or gear wear and potential drivetrain failure.

When to Replace:
•  During rear axle or differential servicing, or when removing the drive shaft or hub.
•  If you notice oil or grease leaks around the axle, hub, or trailing arm area.
•  As part of preventive maintenance on high-mileage or performance-driven Porsche models.

Replacing restores proper fit, material integrity, and sealing performance - protecting your drivetrain and extending component life.

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99911321840

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Drive shaft sealing ring,  65 x 85 x 8. REAR OUTER SEALING RING
Shaft sealing ring, also commonly referred to as a drive shaft or outer seal, that sits around a rotating shaft or axle in the rear differential/axle assembly. Its primary function is to keep gear oil or differential lubricant contained while preventing contamination from entering the assembly.

Fits:
Porsche 911 (930) Turbo 1975 - 1989

Diagram ref no 11.

• Dimension: Manufactured to replicate the original Porsche part’s critical dimensions (65 × 85 × 8 mm)
• Position: Outer drive-shaft or axle tube interface, rear differential assembly
• Benefit: Accurate dimensions & material matching for proper sealing and long life

Over time, the original seal may harden, crack, or fail under heat, oil exposure and axle rotation, leading to oil leakage, differential lubricant loss or contamination ingress—potentially accelerating bearing or gear wear.

When to Replace:
• During rear axle or differential service, especially when removing the drive-shaft/cross-tube.
• If you observe lubricant leaking from around the outer axle or trailing arm area, or cleaned-up oil traces near the seal.
• As part of preventative maintenance when rebuilding suspensions or axles, especially in Turbo-Look or high-performance 911 models

Replacing with a new seal restores correct internal lubrication, prevents leakage and protects drivetrain components for the long term.

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99911323540

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Clutch fork shaft needle bearing.

Fits:
Porsche 911 1987-89
Porsche 964 1989-94 all models
Porsche 993 1994-98 all models
Porsche 996 Turbo, GT3
Porsche 997 GT3 2005>>

Diagram Ref No 18

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99920136501

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Thrust washer / Timing chain cover washer, also called timing‐case cover/or chain case cover washer.
This washer is an essential part of the timing chain cover assembly, ensuring correct spacing, secure fitment, and long-term reliability of your engine’s timing system.

Fits:
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998

Diagram ref no 18

Function:
• Provides accurate alignment and spacing within the timing chain cover assembly,
• Supports proper sealing to help prevent oil leaks,
• Reduces wear and vibration, protecting engine timing components,

Over time, washers can wear, corrode, or lose their structural integrity.
Replacement may be required if you notice:
• Oil leaks around the timing chain cover
• Irregular noises from the timing case area
• Visible wear or damage during inspection/engine service

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96410544500

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Camshaft to chain tensioner oil line, Left.



Fits:
Porsche 964 (965) Turbo 1989-94

This product supersedes Porsche's old part numbers:
- 93010734706
- 93010734709

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Diagram ref no 9.

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93010734716

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