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Porsche > 964 (911) (1989-1994) > 964 (911) RS 3.8L 1991-93 > Engine Rebuild Parts >

Radial Seal / RMS / Camshaft / Balance shaft

Radial Seal / RMS / Camshaft / Balance shaft

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DISPLAYING 1 to 8 (of 8 products)
Camshaft Front Oil Seal. Porsche 964 / 993 - 99970731340
3
Camshaft Front Oil Seal. Porsche 964 / 993
Special Order item
99970731340
Product Information
Product Information
Camshaft Front Oil Seal. 67.2 x 5.77.
Fits:Left and Right

porsche

Fits:
Porsche 964 1989-94
Porsche 993 1995-98

Diagram ref no 1

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99970731340
99970731340

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Camshaft rear oil seal. Porsche 964 / 993 - 99911346340, 038.865
2
Camshaft rear oil seal. Porsche 964 / 993
Special Order item
PCG113463A
Product Information
Product Information
Camshaft rear oil seal. A 30 x 42 x 7.

porsche

Fits:
Porsche 964 1989-94
Porsche 993 1995-98

Click 'Zoom in' for large parts diagram
Diagram ref no 6

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Related, superseded, cross reference or alternative numbers for comparison.

PCG113463A
99911346340
038.865

The product you are viewing cross references to these numbers
Camshaft rear oil seal. Porsche 964 / 993 - 99911346340, PCG113463A - 81-33402-00, 038.865
1
Camshaft rear oil seal. Porsche 964 / 993
PCG113463A/1
Product Information
Product Information
Camshaft rear oil seal. A 30 x 42 x 7.
for Power steering pump drive pulley

victorreinz

Fits:
Porsche 964 1989-94
Porsche 993 1995-98

Click 'Zoom in' for large parts diagram
Diagram ref no 6

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Related, superseded, cross reference or alternative numbers for comparison.

PCG113463A
99911346340
PCG113463A

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Front main crankshaft seal. Porsche 911 / 964 / 993 / 996T / 997T - 99911329041, 99911329040, 99911329042, 99911304950, 99911329043
2
Front main crankshaft seal. Porsche 911 / 964 / 993 / 996T / 997T
Special Order item
99911329043
Product Information
Product Information
Front main crankshaft seal, located behind the crank pulley. 30 x 50 x 10mm.

Fits:
Porsche 911 1978-80
Porsche 911 1984-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 997 Turbo 2007-11
Porsche 996 GT3 2000-01
Porsche 997 GT3

Diagram ref no 27

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Related, superseded, cross reference or alternative numbers for comparison.

99911329043
99911329041
99911329040
99911329042
99911304950
99911329043

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Front main crankshaft seal. Porsche 911 / 964 / 993 / 996T / 997T - 99911329041, 99911329040, 99911329042, 99911304950, 99911329043 - 347.922
2
Front main crankshaft seal. Porsche 911 / 964 / 993 / 996T / 997T
99911329043/1
Product Information
Product Information
Front main crankshaft seal, located behind the crank pulley. 30 x 50 x 10mm.

Fits:
Porsche 911 1978-80
Porsche 911 1984-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 997 Turbo 2007-11
Porsche 996 GT3 2000-01
Porsche 997 GT3


Diagram ref no 27

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

99911329043
99911329041
99911329040
99911329042
99911304950
99911329043

The product you are viewing cross references to these numbers
O-Ring for Front Camshaft Flange - 67.2x5.77. Porsche 964 / 993 Carrera / RS / Turbo 1989-1998 - 99970731340
2
O-Ring for Front Camshaft Flange - 67.2x5.77. Porsche 964 / 993 Carrera / RS / Turbo 1989-1998
99970731340/1
Product Information
Product Information
O-ring - 67.2 x 5.77 - for front camshaft flange. 

Sold individually; fits left or right camshaft. 

Fits:
Porsche 964 Carrera / RS 1989-94
Porsche 964 Turbo 3.6L 1993-94*

Porsche 993 Carrera / RS 1994-98
Porsche 993 Turbo / GT2 1995-98

Diagram ref. 1.

*NOTE: This o-ring is intended for later 3.6L 964 Turbo models and is not compatible with the earlier 3.3L engine.

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99970731340
99970731340

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Rear Main Oil Seal. Porsche 964 / 993 / 996 - 99911342641, 311.898, 21074, 569.120
2
Rear Main Oil Seal. Porsche 964 / 993 / 996
Special Order item
99911342641::1
Product Information
Product Information
Rear Main Oil Seal. 90 x 110 x 12.
Fitting Position: Transmission End, Inner Diameter: 90 mm, Outer diameter: 110 mm, Width: 12 mm, Radial Shaft Seal Design

porsche

Fits:
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 996 Turbo / GT2 / GT3 MKI

Porsche 944 - All models including 944S, 944 Turbo & 944S2 built 1982-1991

Porsche 924S - All models built 1986-1988

Porsche 928 - All models built 1986-1995

Porsche 968 - All models built 1992-1995


Click 'Zoom in' for large parts diagram.
Diagram Ref No. 21



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99911342641
99911342641
311.898
21074
569.120

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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
DISPLAYING 1 to 8 (of 8 products)
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About Radial Seal / RMS / Camshaft / Balance shaft

Radial Oil Seals – Precision Engine Sealing for Porsche Performance and Reliability

The radial oil seals in your Porsche engine — including the rear main seal, camshaft seal, balance shaft seal, and crankshaft seal — are critical to maintaining oil pressure, preventing leaks, and protecting your engine’s moving components. These seals keep lubricating oil contained within the engine while keeping out dust and contaminants, ensuring smooth operation and long-term reliability.

At Design911, we offer a complete range of radial oil seals developed for exceptional fitment and performance across classic and modern Porsche models. Manufactured from high-grade elastomers and reinforced materials, these seals withstand extreme temperatures, oil pressure, and rotational speeds. Whether you’re rebuilding a classic 911 engine or maintaining a modern turbocharged model, our manufacturer-quality seals provide the leak-free performance your Porsche deserves.

What Do Radial Oil Seals Do?

Radial oil seals (also known as shaft seals or lip seals) provide a vital barrier between rotating and stationary engine components.

Core Functions:

  • Seal engine oil within the crankcase and camshaft housings.
  • Prevent external contaminants from entering the lubrication system.
  • Maintain correct oil pressure for optimal engine performance.
  • Reduce friction and wear on critical rotating components.
  • Enhance engine longevity by ensuring consistent lubrication.

Each seal — whether on the crankshaft, camshaft, or balance shaft — contributes to maintaining an efficient, leak-free lubrication system.

Why Do Radial Oil Seals Fail?

Over time, oil seals are exposed to high heat, pressure, and chemical degradation, which can cause them to harden or crack. Once they lose flexibility, oil begins to escape — leading to contamination, reduced lubrication, and potential engine damage.

Common Causes of Failure Include:

  • Age-related hardening and loss of elasticity.
  • Excessive crankcase pressure from blocked breathers.
  • Oil contamination that breaks down sealing material.
  • Heat and friction causing surface wear.
  • Improper installation or alignment issues during rebuilds.

Typical signs of failure include oil leaks around the rear of the engine, oil spots under the car, or visible seepage near timing covers or crankshaft pulleys. Addressing these early prevents more serious damage.

Why Replace Radial Seals?

Replacing worn or leaking radial oil seals is essential for preventing oil loss and protecting your Porsche engine’s internal components. Our high-performance seals are designed to meet or exceed manufacturer standards for sealing efficiency, durability, and temperature resistance.

Key Benefits:

  • Restores proper oil sealing and pressure.
  • Prevents leaks and contamination.
  • Resists high heat, oil exposure, and chemical degradation.
  • Reduces wear on crankshaft and camshaft housings.
  • Ensures long-term reliability and performance.
  • Direct-fit compatibility for Porsche 911, Cayman, Boxster, Panamera, Cayenne and more.

Replacing these seals during engine service or rebuilds helps preserve oil integrity, reduce emissions, and protect against costly repairs.

Highlights:

  • High-quality radial oil seals for Porsche engines.
  • Rear main, camshaft, balance shaft, and crankshaft seal options.
  • Heat- and oil-resistant construction for maximum longevity.
  • Designed to handle high RPM and oil pressure conditions.
  • Perfect for rebuilds, upgrades, and preventive maintenance.
  • Engineered for a precision fit and long-term leak-free operation.

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