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A seal that prevents oil from leaking out of the crankcase

Switch that detects when the engine is decelerating or idling

Screw used to adjust the engine's idle speed

Pipe connecting exhaust system components in Vanagon/T25 Waterboxer engines

Components that seal the spark plug wells in the engine

A seal used to prevent leaks in the distributor of a petrol engine

Front or rear lift-up portion of an auto body for engine or trunk access

Spring used to secure temperature sensor in place

Stud holding the cylinder head in place in an engine

System combining two drive principles, such as TSI unit and electric motor

Device limiting vacuum in engine at high altitude

The components that control the engine's speed and acceleration.

A type of nut used to secure the cylinder head to the engine block

Electronic control unit that uses Hall effect sensors to regulate engine functions

Gasket used to seal connection between exhaust manifold and downpipe

A valve that allows fluid to flow in one direction and prevents backflow

Seal used to prevent leaks in temperature sensor applications

The housing around the engine cooling fan that directs airflow across the cylinders and cylinder heads on an air-cooled VW engine. Type 2 shrouds differ by engine and model year; this term does not describe the liquid-coolant radiator used on water-cooled Vanagons.

An engine that rejects heat directly to moving air rather than circulating liquid coolant. Gerry’s spark-plug reference separates bus applications by engine code and period: ED/GD/GE for 1975–1979 and CV for 1980–1983, including California models. A May 2002 Gerry discussion titled “83 Air Cooled - Production dates” concerns an owner’s September 1983 Westfalia and the difficulty of finding comparable 1983 examples; it is a period-specific production question, not a universal fitment chart.

A measure of an oil's resistance to changes in viscosity due to temperature fluctuations.