Chevrolet Silverado / GMC Sierra. Manual — part 586

2. Replace the rocker arm shaft if the measured value is less than the service limit.

Fig. 31: Measuring Rocker Arm Shaft Inside Diameter
Courtesy of GENERAL MOTORS CORP.

3. Measure the rocker arm inside diameter. The production value is 22.01-22.035 mm (0.8665-

0.8675 in).

4. Calculate the rocker arm shaft to rocker arm clearance.

1. Subtract the rocker arm shaft outside diameter from the rocker arm inside diameter.

2. Replace the rocker arm if the rocker arm shaft to rocker arm clearance is over 0.2 mm

(0.0079 in).

5. Inspect the valve lash adjusting screw and lock nut for damage. Replace the valve lash

adjusting screw if any damage is found.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 32: Measuring Pushrod For Warpage
Courtesy of GENERAL MOTORS CORP.

6. Measure the pushrods for warpage.

7. Replace the pushrod if the warpage exceeds 0.8 mm (0.031 in).

PISTON OIL COOLING NOZZLE CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 33: View Of Piston Oil Cooling Nozzle Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Inspect the piston oil cooling nozzle for damage.

2. Replace the piston oil cooling nozzle if any damage is found.

OIL PUMP CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 34: View Of Oil Pump Gear Cover & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Remove the oil pump gear cover bolts.

2. Remove the oil pump gear cover.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado