Cadillac Engine >> LOWER END KNOCKING NOISE ON HT-4100 ENGINES

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Cadillac Engine >> LOWER END KNOCKING NOISE ON HT-4100 ENGINES

Lower End Knocking Noises On
GM 4.1L (252 CID) HT-4100 Engines

Some Cadillac automobiles equipped with 4.1L (252 CID) HT-4100 engines
may experience lower end knocking noises.

According to Cadillac, such a noise may be caused by interference between the cylinder block or piston and the first crankshaft counterweight (see illustration). Apparently later style crankshafts were produced with fully machined counterweights to eliminate interference conditions.

Transverse engines use crankshaft Part #1629092 while longitudinal
engines use crankshaft Part #1629093.

For additional information see AERA Bulletins: TB 474R & TB 491

The AERA Technical Committee

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