Type 25 Cylinder Head Gasket (3 Notch) - 1700cc Diesel Engines (KY Engine Code)

This “3 notch” cylinder head gasket is designed 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, playing a critical role in maintaining compression, combustion efficiency, and engine reliability.

On VW diesel engines, head gasket thickness is determined by measured piston protrusion above the engine block. This gasket is 1.61 mm thick and is intended for engines with piston projection between 1.01 mm and 1.10 mm. Correct notch selection is essential—using the wrong thickness can affect compression ratio, starting performance, and long-term durability.

The term “3 notch” (or “3 hole”) refers to the three small identification holes stamped into the lower front left corner of the gasket. This makes it easy to visually confirm the correct gasket before installation.

Technical details

• Engine type: 1.7 Diesel

• Engine code: KY

• Gasket thickness: 1.61 mm

• Piston protrusion range: 1.01–1.10 mm

• Identification: 3 notch / 3 hole

• Quality: Good quality replacement

Related parts to consider

• New cylinder head bolts (stretch bolts – always replace)

• Injector heat shields

• Rocker cover gasket

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

Alternative gasket sizes

• 1 notch / 1 hole: 033103383K

• 2 notch / 2 hole: 033103383L

Vehicle Fitment Summary

Volkswagen Type 25 / T3

• 1.7 Diesel KY: 1985–1992