Chevrolet Silverado / GMC Sierra. Service manual — part 2130

7. Inspect the camshaft sprocket pin (204) for damage.

8. 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. 63: Camshaft Bearings
Courtesy of GENERAL MOTORS CORP.

9. 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.

10. Inspect the camshaft bearings for excessive wear or scoring.

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

Bearings with excessive scoring or wear must be replaced.

Fig. 64: Measure Camshaft Journals With Micrometer
Courtesy of GENERAL MOTORS CORP.

11. 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
camshaft.

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. 65: Measuring Camshaft Lobes
Courtesy of GENERAL MOTORS CORP.

12. 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

Fig. 66: Measuring Camshaft Runout
Courtesy of GENERAL MOTORS CORP.

13. Measure the camshaft runout.

1. Mount the camshaft in wooden V-blocks or between centers on a fixture.

2. Using the J 7872 , measure the runout of the intermediate camshaft bearing journals.

3. If camshaft runout exceeds 0.05 mm (0.002 in), the camshaft is bent and should be

replaced.

Measuring Camshaft Lobe Lift

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