B350 1 Ton Van V8-5.9L VIN Z (1992)
Air Injection Pump: Description and Operation
LOCATION
The air pump is mounted on the front of the engine and driven by a belt connected to the crankshaft pulley.
Air Injection Pump
OPERATION
Intake air passes through a fan at the front of the pump. Foreign materials are separated from the air by centrifugal force. Air is delivered to air
injection manifold and check valve tube assembly through diverter valve and switching valve.
The air injection system is not completely noiseless. Under normal conditions, noise rises in pitch as engine speed increases. To determine if
excessive noise is fault of air injection system, disconnect drive belt and operate engine. If noise does not exist, proceed with diagnosis.
The only serviceable component of this pump is the centrifugal fan filter. Do not assume the pump is defective if it squeaks when turned by hand.
DO NOT LUBRICATE PUMP. Wipe all oil off of pump housing. Oil in the pump will cause rapid deterioration and failure.
CAUTION: Completely cover the fan filter before cleaning the engine or underhood compartment. The filter must be covered to prevent liquids
from entering the pump.
