Engine - Accessory Drive Belt Wear

89cadillac01

Bulletin No. T-89-56
File in Group 6B
Number 21
Corp. Ref. No. 816111
Date Jan. 1989

SUBJECT: ACCESSORY DRIVE BELT WEAR


MODELS AFFECTED: 1988-1989 ALLANTES


Some 1988-1989 Allantes may experience serpentine drive belt wear (i.e., premature belt shredding). On vehicles with this condition the drive belt rides up on the inboard flange of the generator pulley. Prolonged use in this condition will result in belt failure or belt thrown off.

This condition may be caused by mis-machining of the generator support bracket to the surface on which the idler pulley is attached. If this surface is not perpendicular to the generator pulley, the resulting angularity will cause the belt to ride up.

Vehicles Involved

^ 1988 Allantes in VIN range JU101932 to JU102432
^ 1989 Allantes in VIN range KU100001 to KU100635

Repair

Inspect suspect vehicles as follows:

1. Note that over an approximately 90~ arc the idler pulley and generator fan blade overlap.

2. Measure the distance between the back flange of the idler pulley and the front face of the generator fan blade.

3. This clearance must be greater than 0.100" and also have a side-to-side difference less than 0.020".

4. If the above dimensions are beyond specifications, generator support must be replaced.


VEHICLE SERIES
Operation Operation
Description Number C D E J K V

Bracket, Generator Mounting-Replace J4160 .6


Part Group: 2.277
Policy: T