S10/T10 P/U 4WD L4-151 2.5L (1985)
Crankshaft Gear/Sprocket: Technical Service Bulletins
Camshaft/Crankshaft - Revised Servicing Parts
Number:
90-158-6A
Section:
6A
Date:
February 1990
Corp. Bulletin No.: 936103
Subject:
SERVICING CAMSHAFT/CRANKSHAFT GEARS
Model and Year:
1980-85 X CAR AND 1985-90 A, F CAR WITH 2.5L (VIN CODE R, V, 2) ENGINES 1977-90 S, T TRUCK AND 1985-90 M
VAN WITH 2.5L (VIN CODE E, R, U) ENGINES
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 89-240-6A, DATED AUGUST 1989. THE 1990 MODEL
YEAR HAS BEEN ADDED. ALL COPIES OF 89-240-6A 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 a 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:
GMSPO has superseded the individual camshaft gear part numbers with the gear kit part numbers.
Parts are currently available from GMSPO.
Use the appropriate Labor Time from the Labor Time Guide when replacing a Camshaft and Crankshaft Gear.
Refer to Dealer Service Bulletin No. 88-278-6A for details on camshaft gear removal and installation.
TRUCKS ONLY
Refer to "Service Manual Update" dated September, 1988 (Sec. 6A1) for camshaft/ crankshaft gear replacement procedures.
For vehicles repaired under warranty use:
Labor Operation Number:
J0840
Labor Time:
M Van 2.3 Hrs. (plus applicable "adds")
S/T 2.7 Hrs. (plus applicable "adds")