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Chevrolet Silverado / GMC Sierra. Manual - part 2128
Tools Required
J 7872 Magnetic Base Dial Indicator Set
J 8520 Camshaft Lobe Lift Indicator. See Special Tools .
Cleaning & Inspection
Fig. 56: Identifying Camshaft Inspection Areas
Courtesy of GENERAL MOTORS CORP.
1. Clean the components in solvent.
CAUTION: Refer to Safety Glasses and Compressed Air 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
2. Dry the components with compressed air.
3. Inspect the camshaft bearing journals (1) for scoring or excessive wear.
4. Inspect the camshaft valve lifter lobes (2) for scoring or excessive wear.
5. Inspect the threaded bolt hole (3) in the front of the camshaft for damaged threads or debris.
6. Inspect the camshaft sprocket pin (204) for damage.
7. Inspect the camshaft retainer plate for wear or a damaged sealing gasket.
If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.
Fig. 57: Camshaft Bearings
Courtesy of GENERAL MOTORS CORP.
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
8. Inspect the camshaft bearings for proper fit in the engine block. Camshaft bearings have an
interference fit to the engine block and should not be loose in the engine block bearing
bores.
9. Inspect the camshaft bearings for excessive wear or scoring.
Bearings with excessive scoring or wear must be replaced.
Fig. 58: Measure Camshaft Journals With Micrometer
Courtesy of GENERAL MOTORS CORP.
10. Using a micrometer, measure the camshaft journals for wear and out-of-round.
If the camshaft bearing journals are greater than 0.025 mm (0.001 in) out-of-round,
replace the camshaft.
If the camshaft bearing journal diameter is less than 54.99 mm (2.164 in), replace the
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
camshaft.
Fig. 59: Measuring Camshaft Lobes
Courtesy of GENERAL MOTORS CORP.
11. Using a micrometer, measure the camshaft lobes for wear. Refer to Engine Mechanical
Specifications (RPO LY5 VIN J) or Engine Mechanical Specifications (RPO LC9
VIN 3) or Engine Mechanical Specifications (RPO LY2 VIN C) or Engine
Mechanical Specifications (RPO LH6 VIN M) or Engine Mechanical Specifications
(RPO LMG VIN 0) or Engine Mechanical Specifications (RPO LY6 VIN K) or
Engine Mechanical Specifications (RPO L76 VIN Y) or Engine Mechanical
Specifications (RPO L92 VIN 8) .
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
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