Chevrolet Silverado / GMC Sierra. Service manual — part 579

Subtract the piston pin measurement that was taken previously from the piston pin bore
measurement. The difference between these two measurements will be the piston pin to
piston pin bore clearance.

The production clearance is 0.004-0.017 mm (0.0002-0.0007 in) and the service limit
is 0.017 mm (0.0007 in).

If the piston pin to piston pin bore clearance is beyond specifications then replace the
piston.

Fig. 7: Measuring Piston Pin To Connecting Rod Small End Clearance
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

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

7. Measure the piston pin to connecting rod small end clearance.

Measure the inside diameter of the connecting rod small end.

Subtract the piston pin measurement that was taken previously from the connecting rod
small end measurement. The difference between these two measurements will be the
piston pin to connecting rod clearance.

The production clearance is 0.012-0.027 mm (0.0005-0.0011 in) and the service limit
is 0.08 mm (0.0031 in).

Replace the connecting rod if the piston pin to connecting rod small end clearance is
beyond specifications. The connecting rod small end bushing is not serviceable.

PISTON AND CONNECTING ROD ASSEMBLE

Tools Required

J 43654 Piston Pin Retainer Remover/Installer. See Special Tools .

Assemble

2008 Chevrolet Silverado 1500

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

Fig. 8: View Of Piston Pin Retaining Clips
Courtesy of GENERAL MOTORS CORP.

1. Apply engine oil to the connecting rod small end bushing and to the piston pin bore of the

piston.

2. Install the piston pin into the piston and connecting rod.

IMPORTANT:

For the right bank piston and connecting rod
assemblies, reassemble so the grade mark on the
connecting rod faces the right side of the engine and the

2008 Chevrolet Silverado 1500

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

3. Install the piston pin retaining rings.

piston front mark faces the front of the engine.

For the left bank piston and connecting rod assemblies,
reassemble so the grade mark on the connecting rod
faces the left side of the engine and the piston front
mark faces the front of the engine.

2008 Chevrolet Silverado 1500

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