Chevrolet Silverado / GMC Sierra. Manual - part 143
Fig. 479: Crankshaft Balancer Key, Keyway & Threaded Hole
Courtesy of GENERAL MOTORS CORP.
6. Inspect the crankshaft balancer key (1), the keyway (2), and the threaded hole (3) for
damage.
Repair or replace the crankshaft as necessary.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 480: Measuring Crankpins For Out-Of-Round & Taper
Courtesy of GENERAL MOTORS CORP.
7. Measure the crankpins for out-of-round and taper. Refer to Engine Mechanical
Specifications.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 481: Measuring Crankshaft Runout
Courtesy of GENERAL MOTORS CORP.
8. Use a suitable support to support the crankshaft on the front and rear journals.
9. Use the J 7872 in order to measure the crankshaft journal runout. The proper crankshaft
journal runout is 0.025 mm maximum (0.0010 in maximum).
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
