SERVICING CAM AND/OR CRANK GEARS (REPLACE GEAR SET)

MODELS/YEARS 1978-80 STARFIRE, 1982-84 OMEGA, 1982-90 CUTLASS CIERA AND 1985-90 CUTLASS CALAIS MODELS EQUIPPED WITH 2.5L ENGINE (VIN CODE R, U & V)

This bulletin has been revised to provide a separate torsional damper for 1985-86 Cutlass Calais models equipped with a 2.5L (VIN Code U) engine which require a distributor timing mark, and to include the 1990 model year.

This bulletin cancels and supersedes Dealer Technical Bulletin 89-T-52B dated October, 1989, which should be discarded.

When servicing the camshaft and/or crankshaft gears on 2.5L engines, it is recommended that a new gear set kit be used to replace the individual gears. The gear kit is comprised of a set of camshaft and crankshaft gears for improved wear resistance.

It is also recommended that the crankshaft torsional damper be installed along with the gear set kit. The damper reduces critical crankshaft vibrations, thereby decreasing camshaft and crankshaft gear wear. When the new damper is installed, the old crankshaft pulley may be discarded. If the engine currently has a damper, it should be reinstalled.

IMPORTANT: The camshaft/crankshaft gear kit should be installed any time the camshaft or crankshaft gears need to be replaced.

The kit part numbers are as follows:

Gear Kit Applicable Torsional Damper VIN Engine Code Part Number Model Years Part Number ---------------- ------------ ----------- ------------ V (Starfire) 10101790 1978-1980 NOT APPLICABLE - R (Omega & Cutlass Ciera) 10101790 1982-1986 Use existing crank pulley

R (Cutlass Ciera) 10101790 1987-1990 10101369

U (Cutlass Calais) 10101789 1985-1986 10112485***

U (Cutlass Calais) 10101789 1987-1990 10124651

GMSPO has superseded the individual camshaft gear part numbers with the gear kit part numbers.

Parts are currently available from GMSPO.

*** Part is expected to be available on February 12, 1990. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. GMSPO will make every effort to obtain parts. All parts will be placed on 400 control waive VIP surcharges. However, the part will be shipped premium transportation at the dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

Use the appropriate Labor Operation and Time from the Labor Time Guide when replacing a Camshaft and Crankshaft Gear.

Refer to Dealer Technical Bulletin 88-T-87, 88-T-87A and 88-T-87B for cam gear service procedure and related information for Cutlass Ciera and Calais models. For cam gear service procedure on Starfire and Omega models, refer to the appropriate service manual.

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.