LeSabre V6-181 3.0L (1986)
NOTICE:
This bulletin corrects the Models Affected listing, changes the design illustration, and replaces dealer service bulletin 87-6-21, which should
be discarded
Some of the above engines may experience excessive wear to the front cover thrust surface and the camshaft thrust button. An engine with this condition
may exhibit a knocking noise most audible just above idle. This knocking noise could be caused by the camshaft chucking (fore and aft movement) in the
block.
A needle bearing and spring assembly, Part Number 25532588, is available through GMSPO to address the above conditions. The needle bearing will
reduce wear to the front cover thrust surfaces and the spring has a higher load rating which will reduce camshaft chucking.
NOTICE:
A higher load rate spring and bearing assembly should not be used in conjunction with the early design Phenolic plastic button. First and
second designs are illustrated on the reverse side.
