Grand AM V6-3300 3.3L (1992)
Harmonic Balancer - Crankshaft Pulley: Customer Interest
Engine - Shudder/Vibration From A Standing Start
Bulletin Number:
92-6-23A
Reference Number:
206101R
Publish Date:
5/92
Subject:
SHUDDER/VIBRATION ON ACCELERATION
FROM STANDING START (INSTALL NEW
CRANKSHAFT PULLEY AND FLYWHEEL)
Models Affected:
1992 GRAND AM W/3300
V6 ENGINE (RPO LG7)
THIS BULLETIN IS BEING REVISED TO CHANGE THE SUBTECT MATTER, CORRECTION PARAGRAPH, AND ADD THE SERVICE
PROCEDURE INFORMATION. THIS BULLETIN CANCELS AND REPLACES BULLETIN 92-6-23 ISSUED 2/91. PLEASE DISCARD
BULLETIN 92-6-23.
CONDITION:
Some early production 1992 Grand Am models with 3300 - V-6 engine may exhibit a shudder and/or vibration from a standing start.
CORRECTION:
This condition could be corrected by changing the engine balance characteristic. The balance characteristic is usually changed enough to correct the
condition with the installation of a new crankshaft pulley. When the crankshaft pulley alone does not correct the condition, installation of the new
flywheel may be necessary. The new pulley and flywheel were introduced into production vehicles beginning on November 12, 1991 with the VIN
breakpoints of "C" 212347 and "M" 022459.
SERVICE PROCEDURE:
1.
Road test the vehicle to verify the condition.
2.
If the shudder is present, replace the crankshaft pulley with part no. 24501985 and road test.
3.
If the shudder is still present, replace the flywheel with part no. 24501986.
4.
Road test the vehicle to verify the repair.
NOTE:
Most vehicles will be repaired by just replacing the balancer. It is not necessary to replace the flywheel if replacing the crankshaft pulley repairs the
vehicle.
NOTE:
If installing flywheel, make sure there is sufficient clearance between the flywheel weight and the block. Rotate the flywheel 360 degrees by hand to
verify sufficient clearance. If there is an interference between the weight and the block, remove stock from the block to obtain sufficient clearance.
NOTE:
Early flywheels (before above VINS) can be identified by "33" stamped on the balance weight. Late flywheels (after VINS listed above) can be
identified by "AN" stamped on the balance weight.
PARTS INFORMATION:
Parts are currently available from GMSPO.
PART NO.
Crankshaft Pulley
24501985
Flywheel
24501986