Chevrolet Silverado / GMC Sierra. Manual - part 153
A properly installed front groove pin should be installed until flush or below flush with
the face of the crankshaft balancer.
Worn, grooved, or damaged crankshaft front oil sealing surface (2)
Minor imperfections on the crankshaft balancer crankshaft front oil seal surface may
be removed with a polishing compound or fine grade emery cloth.
Worn, chunking, or deteriorated rubber (3) between the hub and the outer ring
Worn or damaged keyway (4)
Worn or damaged bolt hole threads (5)
ENGINE FLYWHEEL CLEANING AND INSPECTION
IMPORTANT: A crankshaft front oil sealing surface with excessive
scoring, grooves, rust, or other damage must be
replaced.
IMPORTANT: In order to maintain the proper component balance, contact
surface taper and heat transfer, manual transmission
flywheels are NOT to be machined.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 515: View Of Flywheels
Courtesy of GENERAL MOTORS CORP.
1. Clean the engine flywheel (1 or 2) in cleaning solvent.
2. Dry the engine flywheel with compressed air.
CAUTION: Refer to SAFETY GLASSES CAUTION .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 516: Flywheel Inspection Areas (Automatic Transmission)
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not attempt to repair the welded areas, if present, that
retain the ring gear to the engine flywheel plate. Always
install a NEW engine flywheel.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
3. Inspect the engine flywheel, automatic transmission, if equipped, for the following:
Stress cracks around the engine flywheel-to-torque converter bolt hole locations (1)
Missing balance weights
Stress cracks around the engine flywheel-to-crankshaft bolt hole locations (2 or 3)
Welded areas that retain the ring gear onto the engine flywheel for cracking (4), if
present
Damaged ring gear teeth (5)
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado