Engine - Piston Knock When Cold

9224BUICK01

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