Chevrolet Silverado / GMC Sierra. Service 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

Fig. 482: Measuring Crankshaft End Play
Courtesy of GENERAL MOTORS CORP.

10. Measure the crankshaft end play.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado