Radial Seal / RMS / Camshaft / Balance shaft

Clear seal radial seal spacer bush. 
Sold each



Fits:
Porsche 924S - 1986 to 1988
Porsche 944 / 944 S / 944 S2 - 1982 - 1991
Porsche 944 turbo - 1985 yo 1991
Porsche 968 - 1992 to 1995

Fits behind camshaft seal spacer and balance shaft seal spacers.

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Diagram ref no 5

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94410532100

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Engine timing oil seal / gasket set. 



Fits:
Porsche 944
Porsche 968
Porsche 924S

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00004306500

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Engine timing oil seal / gasket set
This OE Match engine timing dust seal and gasket set is designed for Porsche 944 and Porsche 968 models. The kit contains the seals and gaskets used around the front timing and balance shaft area of the engine, helping protect the timing components and maintain proper sealing of the front engine housing.

Fits:
Porsche 944
Porsche 968
Porsche 924S

Contents list:
3 x 944 105 321 00 Gasket
2 x 999 113 281 40 Aux. Shaft Seal
2 x 999 113 282 40 Camshaft seal Aux. Shaft Seal
1 x 999 113 331 40 Oil Pump/Front main seal Seal
1 x 999 113 349 40 Cam Seal
1 x 999 701 602 40 Cam O-Ring
2 x 999 701 652 40 Aux. O-Ring
1 x 928 105 184 01 Sealing Ring
1 x 999 707 283 40 O-ring for oil pump front crankshaft

The timing section of the Porsche 944/968 engine contains critical rotating components including the camshaft, balance shafts and crankshaft, all protected by covers and seals at the front of the engine. The OE Match dust seal and gasket set provides the sealing elements required when servicing this area.

The kit includes seals and gaskets designed to prevent contamination and leakage around the timing housing. These components are typically replaced during timing belt service, front engine resealing or engine rebuild work.

High-quality gasket materials are used to withstand the temperature, oil exposure and mechanical stresses present in performance engines.

Function
•  Leak Prevention: Seals the front timing housing to prevent oil leakage
•  Component Protection: Keeps dust and debris away from timing components
•  Engine Reliability: Supports proper operation of camshaft and balance shafts
•  Service Solution: Ideal for timing belt replacement or front engine rebuild

Seals and gaskets around the timing assembly are exposed to heat, oil and constant engine vibration. Over time these components can harden, crack or lose elasticity, leading to oil leaks or contamination of the timing area. Replacing them during maintenance helps protect the timing components and maintain engine reliability.

Consider replacing the timing dust seal and gasket set when:
•  Performing a timing belt replacement
•  Rebuilding or resealing the front of the engine
•  Oil leaks appear from the timing cover area
•  Old seals show cracking or deterioration

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00004306500

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O-Ring seal balance shaft housing - 56,7 x 3.53 
Sold each - 2 required per car



Fits:
Porsche 924S - 1986 to 1988
Porsche 944 8v - 1982 to 1987
Porsche 944 S / 944 S2 - 1987 to 1991
Porsche 944 turbo - 1985 to 1991
Porsche 968 - 1992 to 1995

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Diagram ref no 21

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99970165240

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O-Ring seal camshaft bearing - 50x5
Sold each



Fits:
Porsche 924S - 1986 to 1988
Porsche 944 8v - 1982 to 1987
Porsche 944 turbo - 1985 to 1991
Porsche 928 / 928 S / 928 S2 - 1978 to 1986

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Diagram ref no 21

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99970160240

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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



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

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Diagram Ref No. 21

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99911342641

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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
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99911342641

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