Subject: ENGINE NOISE-INSTALL BUSHING 5.7L V8 (RPO LT5)
Model and Year: 1990-92 CORVETTE WITH 5.7L ENGINE (RPO LT5) AND MANUAL TRANSMISSION
Source: Chevrolet Service Bulletin
Bulletin Number: 92-230-6 - (06/15/1992)
Condition:
Some owners of 1990-92 Corvette ZR-1 may comment on a squeal noise that resembles a bearing noise. This noise may occur during clutch engagement from a standing stop. This noise can also occur during vehicle coast down with the clutch disengaged (clutch pedal depressed).
Cause:
This noise is due to the input shaft of the transmission contacting the crankshaft bushing. The noise usually occurs during clutch engagement from a standing stop or vehicle coast down because of the speed difference between the engine and the transmission input shaft.
Correction:
A revised crankshaft bushing is available to reduce the above condition. The revised bushing has grooves in the hole to reduce surface contact with the transmission input shaft.
Crankshaft Bushing P/N 10125896
Remove and install bushing per Service Manual.
Part Availability:
Parts are currently available from GMSPO.
Warranty Information:
Labor Operation: J1420 Use applicable labor time guide for labor hours.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
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Article ID: 486
Created: July 24, 2014
Last Updated: July 24, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1990-1992-corvette-zr-1-service-bulletin-engine-noise-install-bushing-486.html