Chevrolet Silverado / GMC Sierra. Service manual — part 345

1. Clean the crankshaft with solvent.

2. Thoroughly clean all oil passages (2) and inspect for restrictions or burrs.

3. Dry the crankshaft with compressed air.

Inspection Procedure

Fig. 396: View Of Reluctor Ring Teeth

CAUTION: Refer to Safety Glasses Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Courtesy of GENERAL MOTORS CORP.

1. Inspect the CKP reluctor ring teeth (1) for damage.

Fig. 397: Inspecting Crankshaft Journals For Wear
Courtesy of GENERAL MOTORS CORP.

2. Inspect the crankshaft journals for wear.

Journals should be smooth (1) with no signs of scoring, wear, or damage.

3. Inspect the crankshaft journals for grooves or scoring (2).

4. Inspect the crankshaft journals for scratches or wear (3).

5. Inspect the crankshaft journals for pitting or imbedded bearing material (4).

6. Inspect the crankshaft rear oil seal surface (5) for grooves or scoring.

IMPORTANT: The reluctor ring teeth should not have imperfections on the

rising or falling edges. Imperfections of the reluctor ring
teeth may affect OBD II system performance.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 398: View Of Crankshaft Key, Keyway & Threaded Hole
Courtesy of GENERAL MOTORS CORP.

7. Inspect the crankshaft key (122), keyway (1), and threaded hole (2) for damage.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 399: Measuring Connecting Rod Journals For Out-Of-Round And Taper
Courtesy of GENERAL MOTORS CORP.

8. Measure the connecting rod journals for out-of-round and taper.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2