Chevrolet Silverado / GMC Sierra. Service manual — part 2112

Tools Required

J 7872 Magnetic Base Dial Indicator Set

J 43690 Rod Bearing Checking Tool

J 43690-100 Rod Bearing Checking Tool - Adapter Kit. See Special Tools .

Cleaning Procedure

Fig. 3: Oil Passages & CKP Reluctor Ring Teeth
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Use care when handling the crankshaft. Avoid damage to the

bearing surfaces or the lobes of the crankshaft position
(CKP) reluctor ring. Damage to the teeth of the CKP reluctor
ring may affect on-board diagnostics (OBD) II system
performance.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

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. 4: View Of Reluctor Ring Teeth

CAUTION: Refer to Safety Glasses Caution .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Courtesy of GENERAL MOTORS CORP.

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

Fig. 5: View Of Crankshaft Journals
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 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 6: 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 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado