LeSabre V6-231 3.8L VIN B FI (1986)
Camshaft: Customer Interest
Engine - Whistling or Whining Noise
Bulletin
86-6-18
Date
June '86
Ref. No.
86-104-6
SUBJECT:
WHISTLING OR WHINING NOISE FROM ENGINE ASSEMBLY
MODELS AFFECTED: 1986 CENTURYS & LESABRES EQUIPPED WITH 3.8L V-6 (VIN CODE 3) ENGINES
If a whistling or whining noise, that sounds somewhat like an intake air leak, occurs on one of the above vehicles up to approximately 2500 rpm, the
intake manifold sealing areas should be checked for leaks. This can best be accomplished using a plews type oiler, or some other similar tool, and
applying a small amount of oil or water to the intake manifold sealing surfaces. If the noise is still evident, the Serpentine belt should be removed and the
engine run again. If the noise is still audible, the camshaft should then be inspected.
CAMSHAFT
If inspection reveals minute flat spaces or ridges on the lobes of the camshaft that look like those in the illustration, replacing the camshaft should
eliminate the noise.