STARTER GRINDS/CLASHES NEW STARTER DRIVE & FLEXPLATE

MODELS: 1985-88LIGHTDUTYTRUCKSWITH4.3L,S.OL,OR5.7LENGINES

THIS BULLETIN CANCELS AND REPLACES TRUCK SERVICE BULLETIN 88-T-150 TO ADD THE FLEXPLATE INFORMATION. ALL COPIES OF 88-T-150 SHOULD BE DIS- CARDED.

Some vehicles equipped with 4.3L, 5.OL or 5.7L engines and automatic transmissions may experience a condition where the starter and flexplate occasionally do not mesh properly when attempting to start the vehicle. This results in a grinding or clashing sound similar to the noise which would occur if someone were to mistakenly attempt to start a vehicle while the engine was already running. This condition may be addressed by the installation of a new starter drive assembly, P/N 10456422 which features a stiffer jump spring to promote engagement.

When replacing the starter drive assembly for this condition, all the teeth on the ring gear should be inspected for damage. If significant damage is ob- served on three or more consecutive teeth, the flexplate assembly should also be replaced with the appropriate flexplate assembly from the table below to avoid further incidence of this condition.

Application Service Flexplate ----------- ----------------- C, K, G, R, V, M and P 10128414 trucks equipped with 4.3L VIN Z, or 5.OL VIN H or 5.7L VIN M, K

Parts are currently available from GMSPO. For vehicles under warranty, use the following

Labor Time Operation Numbers:

J4600 - Starter Driver Assy, Replace J1400 - Flexplate, Replace J1420 - Flywheel, Replace

Time llowances are to be selected from the appropriate model year Labor Time Guide.

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.