Engine Damper Pulley - Inability to Set Ignition Timing
Bulletin 87-6D-11Date June '87
Ref. No. 87-149-6D
Corp. Ref. No. 736104
SUBJECT: INABILITY TO SET IGNITION TIMING
MODELS AFFECTED: 1987 SKYHAWKS WITH LT2 2.0L OHC AND LT3 2.0 OHC TURBO ENGINES (VIN CODE K AND M)
Early built LT2 and LT3 engines used a crankshaft dampener that could experience an outer "timing" ring rotation relative to the inner crankshaft drive. The result is the inability to check or set spark timing.
If this occurs, install a new dampener pulley, P/N 10083143. Below are the VIN code breakpoints of potential affected vehicles.
ENGINE VIN CODE VEHICLE VIN PRIOR TO
K HK427650
M HK443011
WARRANTY INFORMATION
Use Labor Operation J0700 for dampener pulley replacement.