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Gaskets & Sets
Typical Applications
Hylomar Gasket 3400 can be used as a gasketing compound between machined surfaces. It is ideal for sealing between mating faces on engines and transmission components where resistance to temperature and vibration are essential.
INSTRUCTIONS FOR USE
Hylomar Gasket 3400 should be applied to clean and dry surfaces, free of contamination such as oil or grease. The compound may be dispensed by hand from cartridge, concertina pack, or via a screen printing system. Once applied the joint should be assembled as soon as practical. Any excess compound can be easily wiped off external surfaces with a clean cloth soaked in Acetone or other suitable solvents.
Typical Physical Properties:
UNCURED PRODUCT
Composition: Methyl-Methacrylate
Colour: Yellow
Viscosity @ 25°C / Brookfield Spindle 6 @ 2.5rpm: 100,000cps
Specific Gravity @ 25°C: 1.10 g/ml
Solvent Content: None
Specific Gravity g/ml @ 25°C: 1.04
Flash Point: >100°C
Shelf Life: 1 Year @ 4° to 25°C
CURED PRODUCT
Handling Time: 40 minutes
Functional Cure Time: 4 – 6 hours
Full Cure Time : 24 – 72 hours
Shear Strength : 1.5 N/mm²
Mild Steel/Mild Steel BS 5350 Part C5
Aluminium/Aluminium BS 5350 Part C5
Temperature Range: -40° to 150°C
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Price is for each.
Fits:
Porsche 928 1978-86
Click 'Zoom in' for large part diagram.
Diagram Ref No 39.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811033003
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
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Price is for each.
Fits:
Porsche 928 1978-86
Diagram Ref No 39.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811033003
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
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2 per car. Price is for each.
Fits:
Porsche 928 S4 / GT 1987-91
Porsche 928 GTS 1992-95
Diagram Ref No 5.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811058002
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
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2 per car. Price is for each.
Fits:
Porsche 928 S4 / GT 1987-91
Porsche 928 GTS 1992-95
Diagram Ref No 5.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811058002
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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Oil Separator Gasket
High-quality replacement oil separator gasket designed for Porsche 928 models from 1978 to 1986.
This gasket seals the oil separator housing within the
engine breather system, helping to maintain proper crankcase ventilation and
prevent oil leaks. It plays a key role in ensuring efficient engine operation
and reducing oil vapour escape.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Diagram ref no 23
Manufactured from a modern fibre-reinforced sealing material, this upgraded gasket offers improved durability and resistance to heat, oil, and pressure compared to original materials.
Reference Number: 92810770704
Key Features
• Direct replacement oil separator gasket
• Suitable for Porsche 928 models (1978–1986)
• Fibre-reinforced material for enhanced durability
• OEM-style fit and sealing performance
• Resistant to heat, oil, and pressure
• Ideal for maintenance, repair, or engine rebuilds
Function and Purpose
This gasket ensures a secure seal within the oil separator system.
It helps to:
• Prevent oil leaks from the breather system
• Maintain proper crankcase ventilation
• Reduce oil vapour escape
• Support overall engine efficiency
Why Replace Your Oil Separator Gasket
Breather system gaskets can degrade over time due to heat and oil exposure.
Common issues include:
• Oil leaks around the separator housing
• Hardened or brittle gasket material
• Reduced sealing performance
• Increased oil vapour or engine contamination
Replacing the gasket restores proper sealing and system function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810770704
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
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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
Click 'Zoom in' for large parts diagram.
Diagram ref no 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970160240
The product you are viewing cross references to these numbers
- 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 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
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Porsche 928 S2 and 928 S4
MLS (Multi Layer Steel) version
Price is for each, 1 x LHS and 1 x RHS required per car
Fits
Porsche 4.7ltr 928 S2
Porsche 5.0ltr 928 S4
Porsche 5.4ltr GTS
Engine Codes
M28.41 - 928 S4 5.0ltr /235KW
M28.42 - 928 S4 5.0ltr /235KW
M28.43 - 928 S 4.7ltr /215KW
M28.44 - 928 S 4.7ltr /215KW
M28.45 - 928 S 4.7ltr /215KW
M28.46 - 928 S 4.7ltr /212KW
M28.47 - 928 GT 5.0ltr /243KW
M28.49 - 928 GTS 5.4ltr /257 KW
M28.50 - 928 GTS 5.4ltr /257 KW
Please check Bore Size and Thickness before ordering
Material: MLS (Multi Layer Steel)
Compressed Thickness: .027 inch to 0.098 inch
Bore Shape: Round
Bore Size (MM): 100
Number of layers: 3 to 5
Orientation: Choose Left (1-4) or Right (5-8)
Gaskets are produced to order
Estimated Delivery Time: 5-6 Weeks
MLS Gaskets
The embossed outer layers of our head gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface
finishes. The MLS Gasket (Multi-Layer Steel) features an active combustion seal on multiple layers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
C578
The product you are viewing cross references to these numbers
- 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
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12 Month Warranty
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Porsche 928 S2 and 928 S4
MLS (Multi Layer Steel) version
Price is for each, 1 x LHS and 1 x RHS required per car
Fits
Porsche 4.7ltr 928 S2
Porsche 5.0ltr 928 S4
Porsche 5.4ltr GTS
Engine Codes
M28.41 - 928 S4 5.0ltr /235KW
M28.42 - 928 S4 5.0ltr /235KW
M28.43 - 928 S 4.7ltr /215KW
M28.44 - 928 S 4.7ltr /215KW
M28.45 - 928 S 4.7ltr /215KW
M28.46 - 928 S 4.7ltr /212KW
M28.47 - 928 GT 5.0ltr /243KW
M28.49 - 928 GTS 5.4ltr /257 KW
M28.50 - 928 GTS 5.4ltr /257 KW
Please check Bore Size and Thickness before ordering
Material: MLS (Multi Layer Steel)
Compressed Thickness: .045 inch to 0.060 inch
Bore Shape: Round
Bore Size (MM): 104
Number of layers: 3 to 5
Orientation: Choose Left (1-4) or Right (5-8)
Gaskets are produced to order
Estimated Delivery Time: 5-6 Weeks
MLS Gaskets
The embossed outer layers of our head gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface
finishes. The MLS Gasket (Multi-Layer Steel) features an active combustion seal on multiple layers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
C578
The product you are viewing cross references to these numbers
- 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
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 924S - 1986 to 1988
Porsche 944 / 944 S / 944 S2 - 1985 to 1991
Porsche 968 - 1992 to 1995
Porsche 928 / 928 S / 928 S2 / 928 S4 - 1978 to 1995
Click 'Zoom in' for large parts diagram.
Diagram ref no 10a
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90017404440
The product you are viewing cross references to these numbers
- 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
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Worldwide Delivery
Oil Filler Cap Seal – Cork
High-quality replacement oil filler cap seal designed for Porsche 928 and 928S models.
This gasket fits within the oil filler cap, providing a
secure seal to prevent oil leaks and maintain proper engine sealing. It is a
critical component for ensuring clean and efficient engine operation.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
Diagram ref no 31
Key Features
• Direct replacement oil filler cap seal
• Suitable for Porsche 928 and 928S models
• Superior resistance to heat, oil, and wear
• OEM-style fit and sealing performance
• Ideal for maintenance and oil leak prevention
Function and Purpose
This seal ensures a tight closure of the oil filler cap.
It helps to:
• Prevent engine oil leaks from the filler neck
• Maintain proper engine sealing
• Protect against dirt and contamination
• Support overall engine cleanliness and performance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810771100
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
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12 Month Warranty
Worldwide Delivery
Oil Filler Cap Seal – FKM Rubber
High-quality replacement oil filler cap seal designed for Porsche 928 and 928S models.
This gasket fits within the oil filler cap, providing a
secure seal to prevent oil leaks and maintain proper engine sealing. It is a
critical component for ensuring clean and efficient engine operation.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
Diagram ref no 31
Unlike the original cork version, this upgraded seal is manufactured from modern fluorocarbon rubber (FKM), offering significantly improved resistance to heat, oil, and ageing for long-term durability.
Key Features
• Direct replacement oil filler cap seal
• Suitable for Porsche 928 and 928S models
• Upgraded FKM (fluorocarbon rubber) material
• Superior resistance to heat, oil, and wear
• OEM-style fit and sealing performance
• Ideal for maintenance and oil leak prevention
Function and Purpose
This seal ensures a tight closure of the oil filler cap.
It helps to:
• Prevent engine oil leaks from the filler neck
• Maintain proper engine sealing
• Protect against dirt and contamination
• Support overall engine cleanliness and performance
Why Upgrade from Cork to FKM
Original cork seals are prone to deterioration over time.
Benefits of FKM material include:
• Increased resistance to oil and high temperatures
• Longer service life
• Reduced risk of cracking or shrinkage
• Improved sealing reliability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810771100
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
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Contents: Timing chain set (timing chain both shoes and screws), valve cover sealing set (see picture)
Fits:
Porsche 928 S 5.0 (85 - 94) two maintenance kits required
Porsche 928 S4 (86 - 91) two maintenance kits required
Porsche 928 GT (89 - 91) two maintenance kits required
Porsche 928 GTS (91 - 95) two maintenance kits required
Porsche 944 S (86-88)
Porsche 944 S2 (89-91)
Description:
The four-valve technology is one of the sensitive parts of these otherwise robust engines: A regular replacement of the chain and its sliding elements is essential to avoid major damage. Combined with the sealing kit for the valve cover, you will receive all the parts you need to carry out the repair professionally.
Note:
For many vehicles over the years for cost reasons, only the upper shoe and the chain was changed. But even the lower shoe enters and becomes porous. Therefore, better anticipate the risk and take a look under the valve cover.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1232
The product you are viewing cross references to these numbers
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
703141410
The product you are viewing cross references to these numbers
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12 Month Warranty
Worldwide Delivery
Engine Gaskets & Gasket Sets – Precision Sealing for Porsche Engines
Engine gaskets are vital components that ensure your Porsche’s engine operates efficiently and leak-free. Positioned between key engine surfaces such as the cylinder head, intake manifold, and oil pan, gaskets maintain a perfect seal against high temperatures, pressures, and fluids.
At Design911, we offer a comprehensive range of engine gaskets, seals, and complete gasket kits for Porsche models of every generation. Each gasket is crafted from high-quality composite, metal, or elastomer materials to withstand the extreme conditions of high-performance engines — ensuring optimal sealing, reduced oil and coolant leaks, and consistent compression.
Whether you’re rebuilding a classic 911 flat-six or servicing a modern turbocharged Porsche engine, our manufacturer-quality gaskets and complete kits guarantee reliability, performance, and peace of mind.
What Do Engine Gaskets and Gasket Sets Do?
Gaskets play a critical role in ensuring that various engine systems — combustion, lubrication, and cooling — remain properly sealed.
Core Functions:
- Prevent
leaks of oil, coolant, air, and combustion gases.
- Maintain
compression between the engine block and cylinder head.
- Ensure
efficient combustion and proper engine pressure balance.
- Protect internal components from cross-contamination of fluids.
A properly sealed engine not only improves performance and efficiency but also prevents costly long-term damage.
Why Do Gaskets Fail?
Despite their durability, gaskets naturally degrade over time due to extreme heat cycles, pressure variations, and material fatigue.
Common Causes of Gasket Failure Include:
- Overheating,
causing warping or breakdown of the gasket material.
- Improper
installation or torqueing during assembly.
- Aging
materials that harden or crack with use.
- Chemical
degradation from oil or coolant exposure.
- Uneven pressure or engine vibration, leading to micro-leaks.
Typical symptoms of gasket failure include oil or coolant leaks, reduced compression, overheating, or visible residue at gasket joints.
Why Replace with Precision-Engineered Gaskets and Kits?
Replacing worn or leaking gaskets is essential to maintain proper engine compression, prevent contamination, and restore overall reliability. Our direct-fit gasket sets and kits are designed to meet or exceed Porsche engineering standards, providing complete sealing solutions for rebuilds and maintenance.
Key Benefits:
- Restores proper sealing and compression integrity.
- Prevents oil and coolant leaks for cleaner performance.
- Enhances efficiency and reliability under load.
- Manufactured from high-grade, heat- and pressure-resistant materials.
- Available
as individual gaskets or complete kits for full rebuilds.
- Direct-fit compatibility for a wide range of Porsche models.
Our gasket sets are ideal for engine rebuilds, overhauls, and preventive maintenance, ensuring long-term dependability and peak performance.
Highlights:
- Complete Porsche engine gasket kits and individual components.
- Precision-engineered for exact sealing performance.
- Constructed from advanced composite, metal, and elastomer materials.
- Resistant to heat, pressure, and chemical exposure.
- Suitable for classic air-cooled and modern water-cooled engines.
- Ensures leak-free operation and lasting reliability.
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Oil System Parts
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Fuel System Parts
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Radial Seal / RMS / Camshaft / Balance shaft
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Belts / Tensioners / Rollers
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Chains & Tensioners
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Timing covers and gaskets
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Engine Bearings / Shells
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Engine Valves / Guides / Springs
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Engine Bolts / Studs
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Engine Mounts
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Piston Rings
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Engine Cylinders / Liners / Pistons
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Connecting Rod
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Cylinder Head / Camshaft Carrier
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Camshaft covers / Gaskets
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Camshaft gears / sprockets and fixings
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Crankcase Parts
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Crankshaft & Parts
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Turbo Chargers / Intercoolers & Parts
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Air Intake & Injection
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Carburetors & Parts
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Specialist Tools
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Saturday: Closed
Sunday: Closed