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T4 Rocker Cover Stud Seal (1X,ABL,AAF,ACU,AAB)

This rocker cover stud seal (also known as a sealing cone) fits over the rocker cover studs and seals the joint between the rocker cover and the clamp washer when the cover is tightened down. It plays a vital role in preventing engine oil from seeping past the studs and appearing around the top of the rocker cover.

On VW T4 engines, these seals are exposed to constant heat and oil vapour. Over time they harden, shrink, or lose their sealing profile, which commonly results in persistent oil leaks even after fitting a new rocker cover gasket. Replacing the stud seals restores proper compression at each fixing point and ensures a clean, oil-tight installation.

Manufactured to the correct shape and material specification, this seal compresses evenly under load and is ideal for routine servicing, leak repairs, or full engine refresh work.

What it does / how it works

  • Sits on top of the rocker cover, around each mounting stud

  • Seals between the rocker cover and clamp washer

  • Prevents oil tracking up the stud threads

  • Works together with the rocker cover gasket for a complete seal

Quantity required (important)

  • 1.9 Diesel engines: 3 seals required

  • 2.4 Diesel & 2.5 Petrol engines: 4 seals required

Fitting notes

  • Always replace stud seals when removing the rocker cover

  • Clean the rocker cover, washer, and stud before fitting

  • Tighten evenly and do not overtighten, as excess force can distort the seal


Full Vehicle Fitment Details

VW Transporter T4 (1991–2003)

1.9 Diesel / Turbo Diesel

  • Engine size: 1.9 D / 1.9 TD

  • Year range: 09/1990 – 06/2003

  • Typical engine codes: 1X, ABL

  • Quantity required: 3 seals per engine

2.4 Diesel

  • Engine size: 2.4 D

  • Year range: 09/1990 – 07/1993

  • Typical engine codes: AAB / AJA

  • Quantity required: 4 seals per engine

2.5 Petrol

  • Engine size: 2.5 Petrol

  • Year range: 11/1990 – 07/1994

  • Typical engine codes: AAF, ACU, AET, AEU

  • Quantity required: 4 seals per engine

Body styles covered:

  • Bus

  • Van

  • Platform / Chassis

(All T4 variants fitted with the above engines.)

This Part Fits: T4 Transporter

Availability: Stock Item

Item Name: Seal Ring, cylinder head cover bolt

Description: Seal Ring, cylinder head cover bolt

Product Group: Engine

Group: Cylinder Head

Unit of Measure: Each

Manufacturer: JP Group

Dimensions:

Width: 90mm

Height: 70mm

Depth: 20mm

Volume: 126000mm3

Weight: 0.046kg

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