Cadillac Engine >> CLICKING NOISE
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Cadillac Engine >> CLICKING NOISE
Clicking Noise On
GM 4.5 & 4.9L Engines
AERA members should be aware of a noise coming from the front of 4.5 & 4.9L Cadillac engines. The clicking or rasping noise may appear on new and remanufactured engines.
Improper clamping load of the bolts that attach the water pump pulley to the water pump has been found to be the cause. Excessive paint buildup in the threaded bolt holes of the water pump flange may prevent the bolts from achieving the proper torque. A single loose bolt may allow the pulley to wobble
slightly, resulting in the clicking noise.
Technicians should be instructed to remove the paint by running a tap down the threaded bolt holes of the pulley flange before mounting the water pump to the engine. Both original equipment and replacement water pumps may be affected by this condition.
The AERA Technical Committee
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