T4 Head Gasket - 2.5 Petrol (AAF,ACU,AEN,AET,AEU,APL,AVT)

Keep your VW T4 Transporter 2.5 petrol engine running strong with this replacement head gasket, manufactured to provide a dependable seal between the cylinder head and engine block. Designed specifically for the 2.5 petrol “5-cylinder” T4 engines, this gasket is an essential component when carrying out a head rebuild, addressing coolant/oil leaks, or restoring compression after overheating.

With a 1.75mm thickness, it’s built to match the correct factory-style sealing height for the listed engine codes, helping ensure stable compression, correct coolant flow, and long-term reliability.

What this part does

The head gasket seals three critical things at once:

• Combustion pressure inside each cylinder (compression and power)

• Coolant passages between block and cylinder head (temperature control)

• Oil galleries feeding the cylinder head (lubrication)

If the gasket fails, it can allow compression to leak, coolant to enter cylinders, oil and coolant to mix, or external leaks to develop—often resulting in overheating, misfires, white smoke, and loss of power.

How it works

The gasket sits between the engine block and cylinder head and is clamped under the head bolts. Its multi-layer sealing surfaces and reinforced fire rings around the cylinders withstand extreme combustion temperatures while also sealing fluid galleries. The 1.75mm thickness ensures the correct crush and sealing pressure when torqued in sequence to the manufacturer’s specification.

Key specifications

• Application: VW T4 2.5 petrol engines

• Gasket thickness: 1.75mm

• Quality: Direct replacement / precision manufactured

• Quantity: Sold as 1 head gasket

Engine compatibility (fitment)

Suitable for the following T4 2.5 petrol engine codes:

• AAF 2.5 Petrol (09/1990 – 12/1993)

• ACU 2.5 Petrol (08/1993 – 10/1996)

• AEN 2.5 Petrol (05/1995 – 07/1995)

• AET 2.5 Petrol (08/1996 – 09/2003)

• AEU 2.5 Petrol (08/1996 – 11/2001)

• APL 2.5 Petrol (05/1999 – 12/1999)

• AVT 2.5 Petrol (12/1999 – 06/2003)

Fitting notes (recommended while you’re there)

For best results during installation:

• Check cylinder head flatness and cracks before refitting

• Use new head bolts if specified for your engine (many are torque-to-yield)

• Replace associated gaskets/seals often disturbed during the job (rocker cover gasket, inlet/exhaust manifold gaskets, thermostat housing seals, coolant flange O-rings)

• Refill with the correct coolant and bleed the system thoroughly after assembly

This head gasket is a must-have for any proper T4 2.5 petrol rebuild—helping restore compression, prevent leaks, and keep your engine dependable for everyday use and long trips.