W250 3/4 Ton Pickup 4WD V8-318 5.2L VIN R 4-bbl (1982)
Air Injection Check Valve: Description and Operation
This check valve is located in the injection tube assembly that leads to the exhaust manifolds on the eight cylinder engine and the cylinder head on
the six cylinder engine. This valve will protect the system in the event of pump belt failure, excessive high exhaust system pressure or air hose
ruptures.
