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Porsche > 928 (1978-1995) > 928 4.5L 1978-82 > Gearbox / Transmission >

Flywheel / Torque

Flywheel / Torque

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DISPLAYING 1 to 6 (of 6 products)
Flywheel locking tool. Porsche 928 1978-82 - 00072191610
1
Flywheel locking tool. Porsche 928 1978-82
Special Order item
00072191610
Product Information
Product Information
Flywheel locking tool.
porsche

Fits:
Porsche 928 4.5L / 928S until 1982
NOT suitable for 928 S from year of construction 83

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

00072191610
00072191610

The product you are viewing cross references to these numbers
Flywheel locking tool. Porsche 928 1978-82 - 1146, 00072191611
1
Flywheel locking tool. Porsche 928 1978-82
1147
Product Information
Product Information
Flywheel locking tool.
Porsche ref no 00072191610

nordschleife

Fits:
Porsche 928 4.5L / 928S until 1982
NOT suitable for 928 S from year of construction 83

The locking tool is placed on the receiving points of the clutch slave cylinder, thus blocking the crankshaft via the ring gear. It is an indispensable special tool for working on the engine. The tool can be set free of play thanks to the long hole.

Made in Germany. The surface is galvanized.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

1147
1146
00072191611

The product you are viewing cross references to these numbers
Lightweight billet aluminium flywheel. Porsche 928 / 928 S / 928 S2 - 92810220204, 928102202AX, 9281022021, 928102202CX, 92810207501, 92810207502, 92810207801
1
Lightweight billet aluminium flywheel. Porsche 928 / 928 S / 928 S2
92810207502/1
Product Information
Product Information
Lightweight billet aluminium flywheel. 

spec

Fits:
Porsche 928 4.5ltr - 1978 to 1982
Porsche 928 S 4.7ltr - 1981 to 1983
Porsche 928 S2 4.7ltr - 1984 to 1986

“Tuned” Billet Flywheels
Manufactured from only the highest quality steel and aluminum they are the only flywheels on the market manufactured to a .001 machine tolerance. This guarantees a flat seating surface for the clutch and smooth rotational qualities for perfect balance and extended engine life.

Machined friction plate is bolted in place so can be replaced if needed

SPEC billet flywheels are manufactured and developed for specific driving environments and recommended based on how each car reacts to changes in rotating mass.

Please Note
Images may be a representation and may not reflect the actual product.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92810207502
92810220204
928102202AX
9281022021
928102202CX
92810207501
92810207502
92810207801

The product you are viewing cross references to these numbers
Pilot bearing. Porsche 928 - 92810211102
3
Pilot bearing. Porsche 928
Special Order item
92810211102
Product Information
Product Information
Pilot bearing.

porsche

Fits:
Porsche 928 1978-95

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92810211102
92810211102

The product you are viewing cross references to these numbers
Rear main oil seal. Porsche 964 / 993 / 996 - 99911342641, 21074, 99911321440, 99911321540, 99911324240, 99911326440, 99911327040, 99911342640, 99911342641, 99911346140, 569.120
3
Rear main oil seal. Porsche 964 / 993 / 996
99911342641/1
Product Information
Product Information

Rear Main Oil Seal for Porsche 

Restore engine sealing integrity and prevent costly oil leaks with this OE Match Rear Main Oil Seal for the Porsche 964, Porsche 993 and Porsche 996. Manufactured to OE specifications and measuring 90mm inner diameter, 110mm outer diameter and 12mm width, this critical engine seal is designed to prevent engine oil escaping around the rear of the crankshaft where it exits the engine case and connects to the flywheel assembly.

Fits:

  • Porsche 964 (911) C2 1989-93
  • Porsche 964 (911) C4 1989-93
  • Porsche 964 (911) RS 3.6L 1991-93
  • Porsche 964 (911) RS 3.8L 1991-93
  • Porsche 964 (911) TURBO 3.3L 1991-93
  • Porsche 964 (911) TURBO 3.6L 1991-93
  • Porsche 993 (911) C2 1994-97
  • Porsche 993 (911) C4 1994-97
  • Porsche 993 (911) RS 1994-97
  • Porsche 993 (911) C2S 1994-97
  • Porsche 993 (911) C4S 1994-97
  • Porsche 993 (911) TURBO 1994-96
  • Porsche 993 (911) GT2 1994-97
  • Porsche 993 (911) TURBO S 1994-97
  • Porsche 996 TURBO 2000-05
  • Porsche 996 GT2 2001-05
  • Porsche 996 GT3 MKI 1999-02
  • Porsche 924S 2.5L 1986-87
  • Porsche 924S 2.5L 1988
  • Porsche 944 2.5L 8V 1982-87
  • Porsche 944 2.7L 8V 1988-89
  • Porsche 944S 2.5L 16V 1987-88
  • Porsche 944S2 3.0L 16V 1989-91
  • Porsche 944 Turbo 2.5L 8V 1985-88
  • Porsche 944 Turbo 2.5L 8V 1989-91
  • Porsche 944 Turbo S 2.5L 8V 1988
  • Porsche 968 3.0L 1992-94
  • Porsche 968 Sport 3.0L 1994-95
  • Porsche 968 CS 3.0L 1993-95
  • Porsche 968 Turbo S 3.0L 1993-94
  • Porsche 928 4.5L 1978-82
  • Porsche 928S 4.7L 1981-83
  • Porsche 928S2 4.7L 1984-86
  • Porsche 928S4 5.0L 1987-92
  • Porsche 928GT 5.0L 1989-91
  • Porsche 928GTS 5.4L 1992-95

Diagram Ref No. 21

The rear main oil seal, often referred to as the RMS (Rear Main Seal), is one of the most important sealing components in the engine. It retains engine oil inside the crankcase while allowing the crankshaft to rotate at high speed. A worn or damaged seal can lead to oil leaks, clutch contamination and unnecessary engine maintenance costs if left unattended.

This OE Match replacement provides the correct fit, sealing performance and durability required for maintenance, engine rebuilds and preventative servicing.

What Does the Rear Main Oil Seal Do?

The rear main oil seal forms a seal around the rear section of the crankshaft.

Its primary functions include:

  • Preventing engine oil leaks
  • Sealing the rear crankshaft opening
  • Protecting the flywheel area from contamination
  • Maintaining correct engine oil levels
  • Preventing oil reaching the clutch assembly
  • Supporting long-term engine reliability
  • Allowing smooth crankshaft rotation

Without a properly functioning rear main seal, oil can escape from the engine and create a range of reliability issues.

Why Do Rear Main Oil Seals Fail?

Like all rubber sealing components, rear main oil seals are subject to wear and ageing.

Common causes of failure include:

  • Heat cycling
  • Age-related hardening
  • Crankshaft wear
  • Engine vibration
  • Long-term oil exposure
  • Improper installation
  • Excessive crankcase pressure
  • High mileage use

Over time, the sealing lip can lose flexibility and its ability to maintain consistent contact with the crankshaft surface.

Symptoms of a Failing Rear Main Oil Seal

Common warning signs include:

  • Oil leaks between engine and gearbox
  • Oil drips beneath the vehicle
  • Oil contamination around the flywheel housing
  • Clutch slip caused by oil contamination
  • Burning oil smell
  • Gradual oil level loss
  • Oil residue on transmission bellhousing

Because the seal is located behind the flywheel, leaks can often be mistaken for other engine oil leaks unless properly diagnosed.

When Should the Rear Main Oil Seal Be Replaced?

Replacement is recommended when:

  • Oil leakage is present
  • The gearbox is being removed
  • Replacing the clutch assembly
  • Rebuilding the engine
  • Refurbishing the crankshaft
  • Carrying out preventative maintenance
  • The original seal shows signs of ageing
  • Engine mileage is high

Many Porsche specialists recommend replacing the rear main seal whenever the clutch or flywheel is removed, as labour access is significantly easier during these procedures.

Why Replacement Matters

A leaking rear main oil seal can lead to far more expensive repairs if ignored.

Benefits of replacement include:

  • Prevention of engine oil leaks
  • Protection of the clutch assembly
  • Improved engine cleanliness
  • Reduced maintenance costs
  • Improved reliability
  • Professional rebuild standards
  • Long-term sealing performance
  • Greater peace of mind

Replacing the seal during clutch or engine work is considered a smart preventative maintenance measure.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99911342641
99911342641
21074
99911321440
99911321540
99911324240
99911326440
99911327040
99911342640
99911342641
99911346140
569.120

The product you are viewing cross references to these numbers
Single Mass Flywheel Bolt - M10x1.25x24. Porsche 928 / 964 & 993 Carrera RS / 996 GT3 / RS / 997 GT2 RS & GT3 RS - 92810215101, 92810215102
4
Single Mass Flywheel Bolt - M10x1.25x24. Porsche 928 / 964 & 993 Carrera RS / 996 GT3 / RS / 997 GT2 RS & GT3 RS
Special Order item
92810215102
Product Information
Product Information
Single mass flywheel bolt - M10 x 1.25 x 24. 

Sold individually; x9 required per vehicle.

Fits:
Porsche 928 1978-95
Porsche 964 Carrera RS 1991-94
Porsche 993 Carrera RS Clubsport 1995-96
Porsche 996 GT3 1999-01 - With PR 002 / 003*
Porsche 996 GT3 RS 2003-05
Porsche 997 GT3 RS 2007-11
Porsche 997-2 GT2 RS 2010

*PR 002 - 911 Carrera RS Road Version
*PR 003 - 911 Carrera RS Clubsport

Diagram ref. 24.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92810215102
92810215101
92810215102

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DISPLAYING 1 to 6 (of 6 products)
About Flywheel / Torque

Porsche Flywheels & Torque Converters | Smooth Power Transfer & Engine Balance

Flywheels and torque converters are vital components in your Porsche’s drivetrain, ensuring smooth power transfer from the engine to the transmission. The flywheel provides rotational balance and stores kinetic energy for manual gear changes, while the torque converter in automatic models performs a similar role — transferring engine torque hydraulically for seamless acceleration.

At Design911, we supply precision-engineered flywheels and torque converters designed to meet or exceed original performance specifications. Each component is manufactured from high-grade materials, ensuring strength, balance, and reliability under all driving conditions. Whether you’re restoring a classic 911 or maintaining a modern PDK-equipped Porsche, our range provides the quality and performance your drivetrain demands.

What Do Flywheels & Torque Converters Do?

Both components play critical roles in the performance and drivability of your Porsche, acting as torque-transfer systems between the engine and gearbox.

Flywheels (Manual Transmissions):
Store rotational energy to maintain engine smoothness. Provide a friction surface for clutch engagement. Aid in gear transitions by balancing engine speed and torque.

Torque Converters (Automatic Transmissions):
Transfer torque through fluid dynamics between engine and gearbox. Enable smooth gear shifting without clutch operation. Multiply torque for efficient acceleration and smoother driving.

Together, they ensure seamless operation, smooth starts, and optimal power delivery from engine to transmission.

Why Do Flywheels & Torque Converters Fail or Wear Out?

Over time, both flywheels and torque converters experience wear due to high rotational forces, friction, and heat cycles.

Common Causes of Failure Include:

  • Heat damage or warping from clutch slippage (flywheels).
  • Cracked or worn ring gear teeth affecting starter engagement.
  • Fluid contamination or internal seal leaks (torque converters).
  • Bearing wear leading to vibration or imbalance.
  • Excessive torque or misalignment from modified engines.

Symptoms of failure may include clutch chatter, transmission shudder, vibration during acceleration, or slipping during gear changes. Ignoring these signs can lead to further drivetrain damage.

Why Replace your Flywheel or Torque Converter?

Replacing worn flywheels or torque converters restores smooth torque delivery, reduces vibration, and ensures reliable clutch or transmission performance. Upgraded lightweight flywheels improve throttle response, while performance torque converters enhance acceleration and drivability.

Key Benefits:

  • Restores smooth engine-to-transmission power delivery.
  • Eliminates vibration, slippage, and engagement issues.
  • Improves clutch or automatic transmission performance.
  • Balances rotational mass for smoother idling and shifting.
  • Available in lightweight or performance designs for tuned Porsches.
  • Ideal for clutch replacement, transmission rebuilds, or performance upgrades.

It’s strongly recommended to replace the flywheel or torque converter during any major clutch or gearbox service for long-term reliability and balanced performance.

Highlights

  • Premium Porsche flywheels and torque converters.
  • Precision-balanced for smooth, vibration-free operation.
  • Manufactured from high-strength, heat-treated materials.
  • Available for manual, automatic, and PDK Porsche models.
  • Enhances drivability, acceleration, and transmission longevity.
  • Essential for gearbox rebuilds, clutch services, and performance tuning.

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