Type 4 Crankshaft Flange Ring

This cooling fan spacer washer is a vital but often overlooked component used on all Volkswagen Type 4 aircooled engines, including 1700cc, 1800cc, and 2000cc variants. It is fitted between the crankshaft flange and the cooling fan hub and plays a critical role in maintaining correct fan position and V-belt alignment.

On a Type 4 engine, the cooling fan must sit at an exact distance from the crankshaft to ensure the V-belt runs true between the crank pulley and the alternator. This spacer ring sets that distance precisely. If the spacer is missing, worn, or incorrectly fitted, the cooling fan sits too far inward on the crankshaft. This results in poor V-belt alignment, which can cause belt squeal, accelerated belt wear, belt throw-off at higher revs, and inefficient cooling performance.

Proper fan alignment is especially important on Type 4 engines, as the cooling system relies heavily on the fan operating smoothly and at the correct speed. A misaligned fan can also place unnecessary stress on the crankshaft, fan hub, and alternator bearings over time.

These spacer washers are commonly lost during engine rebuilds, fan removal, or previous repairs, and many engines are found missing this part altogether. This brand-new replacement spacer washer restores the factory-correct spacing, ensuring the cooling fan sits exactly where Volkswagen intended.

Suitable for Baywindow Buses and Type 25 (T3) Buses fitted with Type 4 aircooled engines. This is a direct replacement part and installs without modification.

Other parts that may be required when fitting:

• Cooling fan hub

• Cooling fan securing bolt and washer

• V-belt (recommended to inspect or replace if alignment has been incorrect)

Correct installation of this spacer washer helps protect your engine, improves belt life, and ensures reliable cooling under all driving conditions.