D 150 Pickup V8-360 5.9L VIN W (1987)
Air Injection Pump: Description and Operation
Fig. 1 Air injection pump with centrifugal filter fan (Typical)
On L4-135, L6-225, V6-238, V8-318 and V8-360 engines used on models except front wheel drive Rampage and mini vans and wagons, the air pump
is mounted on the front of the engine and is belt driven off the crankshaft pulley. On 4-135 engines used on front wheel drive Rampage and mini vans
and wagons, the air pump is mounted on the rear of the engine and is belt driven off the camshaft. Intake air is passed through a centrifugal fan at the
front of the pump which separates foreign materials from the air by centrifugal force. Air is delivered to the air injection manifold and check valve tube
assembly by a rubber hose through the diverter valve and air switching valve, if used.
The only serviceable component of the pump is the centrifugal fan filter, Fig. 1.
