Skyhawk L4-121 2.0L VIN K TBI (1987)
Piston: Customer Interest
Engine - Piston Knock When Cold
Bulletin 89-6-22
Date Oct., '89
Ref. No. 89-245-6
Corp. Ref. No. 936120
SUBJECT:
COLD ENGINE PISTON KNOCK ON 2.OL (NEW PISTONS)
MODELS AFFECTED:
1987-1989 SKYHAWK WITH 2.OL (VIN CODEL) ENGINES GROUP 6A
Some customers may comment of a cold engine knock at initial vehicle start-up. This condition may be repaired by installation of tighter fitting pistons
available through service parts:
Part Number 10112367
0.04mm O.S.
Part Number 10112368
0.50mm O.S.
Part Number 10112369
1.00mm O.S.
Parts are currently available from GMSPO.
Piston fit should be reduced to .0008" - .0015 clearance. The cylinder case may need to be honed to achieve the desired piston fit. Refer to the Service
Manual Section 6A-20 for proper piston fit instructions.
Labor Operation Number:
J1308
Labor Time:
5.4 Hours
Add:
.3 With Automatic Transmission
Trouble Code
92
