Type 25 Cylinder Head Gasket (1 Notch) - 1700cc Diesel Engines (KY Engine Code)

This “1 notch” cylinder head gasket is designed specifically for 1700cc diesel engines with engine code KY, as fitted to Volkswagen Type 25 / T3 buses. The head gasket seals the combustion chambers, coolant passages, and oil galleries between the cylinder head and engine block, ensuring correct compression, controlled combustion, and reliable cooling.

On VW diesel engines, head gasket thickness is critical and is selected based on piston protrusion above the block deck. This gasket has a thickness of 1.53 mm and is intended for engines with piston projection between 0.81 mm and 0.90 mm. Using the correct notch specification is essential to maintain proper compression ratio and to prevent head gasket failure or piston-to-head contact.

The term “1 notch” (or “1 hole”) refers to the small identifying hole stamped into the lower front left corner of the gasket. This visual marker allows quick confirmation of gasket thickness before installation.

Technical details

• Engine type: 1.7 Diesel

• Engine code: KY

• Gasket thickness: 1.53 mm

• Piston protrusion range: 0.81–0.90 mm

• Identification: 1 notch / 1 hole

Related parts to consider

• Cylinder head bolts (stretch bolts – always replace)

• Injector heat shields

• Rocker cover gasket

• Timing belt and tensioner (recommended when head is removed)

Alternative gasket sizes

• 2 notch / 2 hole: 033103383L

• 3 notch / 3 hole: 033103383M

Vehicle Fitment Summary

Volkswagen Type 25 / T3

• 1.7 Diesel KY: 1985–1992