Waterboxer Cylinder Head Liner Seal (top)

This top cylinder head liner seal is designed for Volkswagen Waterboxer (WBX) engines with 1900cc and 2100cc capacities, as fitted to Type 25 / T3 Transporter models. It is a critical sealing component used at the top of the cylinder liner, ensuring a proper seal between the liner and the cylinder head.

Manufactured as a quality reproduction, this seal is ideal for engine rebuilds, head gasket replacement, or addressing coolant leaks on Waterboxer engines.

What this part does

The top liner seal prevents coolant leakage between the cylinder head and the cylinder liner. On Waterboxer engines, proper sealing in this area is essential to maintain coolant pressure and prevent combustion gases from entering the cooling system. A worn or flattened seal can result in coolant loss, overheating, or head sealing issues.

How it works

The seal sits at the upper edge of the cylinder liner, where it is compressed between the liner and the cylinder head when the head is torqued down. Its precise dimensions ensure correct crush and sealing pressure, compensating for thermal expansion and maintaining a reliable seal throughout engine operation.

Key specifications

• Application: Top cylinder head liner seal

• Engine type: Waterboxer (WBX)

• Engine sizes: 1.9 & 2.1

• Outer diameter: 101mm

• Thickness: 1.5mm

• Quality: Reproduction

• Quantity: Sold individually (4 required per engine)

Vehicle compatibility

• Volkswagen Type 25 / T3 Transporter:

  • Model years 1983–1992

  • 1.9 & 2.1 Waterboxer engines

Fitting notes

• Always replace liner seals when removing cylinder heads

• Ensure mating surfaces are clean and free from corrosion

• Correct torque sequence and specifications must be followed

• Recommended to replace all four seals as a set

This top cylinder head liner seal is a small but vital component for ensuring proper coolant sealing and long-term reliability of your VW Waterboxer engine.