Valve cover gasket. Porsche 991.2 Carrera ❭ 9A21055

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OE Match

9A21055

Product Information

Valve Cover Gasket.
The OE Match Valve Cover Gasket is a high-quality replacement engine sealing component designed to provide a secure, leak-free seal between the valve cover and cylinder head. Manufactured to OE specifications for fit, durability and sealing performance, these gaskets help prevent engine oil leaks while protecting critical valvetrain components from dirt, moisture and contamination.

Fits:

Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19

Diagram Ref No 9

Constructed from premium heat-resistant gasket materials, the valve cover gaskets are engineered to withstand continuous exposure to engine oil, high operating temperatures, pressure fluctuations and vibration. They play a vital role in maintaining lubrication system integrity, engine cleanliness and long-term engine reliability.

What This Product Does:

Creates a leak-free seal between the valve cover and cylinder head.
Prevents engine oil leaks from the valvetrain area.
Helps maintain correct engine oil levels and pressure.
Protects camshaft and valvetrain components from contamination.
Supports efficient engine lubrication.
Helps maintain engine cleanliness and reliability.
Contributes to long-term engine performance and protection.

Symptoms Of Wear Or Failure:

Visible oil leaks around the valve cover.
Oil residue on the cylinder head or surrounding engine components.
Burning oil smell from oil contacting hot engine surfaces.
Oil drips beneath the vehicle.
Low engine oil levels between services.
Smoke from the engine bay caused by oil leakage.
Dirt accumulation around leaking gasket areas.
Oil contamination of nearby ignition components in certain applications.
Increased engine bay contamination from leaking oil.

Why Replacement Matters:

Valve cover gaskets are continuously exposed to engine heat, oil, vibration and thermal cycling. Over time, the gasket material can harden, shrink, crack or lose elasticity, reducing its ability to maintain a proper seal.
A failing valve cover gasket can allow engine oil to escape from the cylinder head area, resulting in oil loss, contamination of surrounding components and reduced engine cleanliness. If left unresolved, ongoing oil leaks can contribute to reduced lubrication efficiency, increased engine wear and potential damage to nearby electrical or ignition system components.
Replacing a worn valve cover gasket restores proper sealing, prevents oil leaks and helps maintain the integrity of the engine lubrication system. An OE Match replacement provides factory-style fitment, dependable sealing performance and long-term durability, ensuring reliable protection for your Porsche engine and valvetrain assembly.

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

9A21055

9A210557100

9A210558100

The product you are viewing cross references to these numbers

Related products

Hylomar Anaerobic Gasket Compound - 300ml Cartridge

F/HG3400H/300M

Product Information

Hylomar Gasket 3400 is a modified anaerobic curing, flexible sealant designed to become a Formed in Place (FIP) Gasket when cured. The cured compound has good temperature resistance and high resistance to fretting. The cure is initiated when the compound is in contact with metal ions and in anaerobic conditions. The cure rate and final strength is dependent on the metals being joined and the temperature at which the component is used. The heat generated by a running engine will accelerate the cure.

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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Valve cover gasket. Porsche 991.2 Carrera ❭ 9A21055