S15/T15 4WD Jimmy L4-151 2.5L (1985)
Camshaft Gear/Sprocket: All Technical Service Bulletins
Engien - Servicing Cam/Crank Gears
GMC NUMBER:
89-T-68
GROUP:
6A - Engine Mechanical
DATE:
June, 1989
CORPORATE
NUMBER:
936103R
SUBJECT:
SERVICING CAM AND/OR CRANK GEARS
MODELS:
1985-89 S/T TRUCKS AND M VANS W/2.5L (VIN CODE E) ENGINE
This bulletin cancels and supersedes GMC Truck Service Bulletin 89-T-48 to add the installation of the torsional damper. All copies of 89-T-48 should
be discarded.
When servicing the cam shaft 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 cam shaft/crankshaft gear kit should be installed any time the camshaft or crankshaft gears need to be replaced.
The kit part numbers are as follows:
VIN
Applicable
Gear Kit
Torsional Damper
Engine Code Model Years
Part Number
Part Number
E
1985-1989
10101790
NOT APPLICABLE-
Use existing
crank pulley
GMSPO has superseded the individual camshaft gear part numbers with the gear kit part numbers. Parts are currently available from GMSPO.
IMPORTANT:
Refer to Issue 4 of "Service Manual Update" dated September, 1988 for revised cam gear replacement service procedure.
For vehicles repaired under warranty, use:
Labor Operation:
J0840
Labor Time:
M-Van 2.3 Hrs (plus applicable adds) S/T 2.7 Hrs (plus applicable adds)