Chevrolet Silverado / GMC Sierra. Service manual — part 474

Fig. 208: Compressing Valve Spring Using J 44646
Courtesy of GENERAL MOTORS CORP.

CAUTION: Compressed valve springs have high tension against the

valve spring compressor. Valve springs that are not
properly compressed by or released from the valve spring
compressor can be ejected from the valve spring
compressor with intense force. Use care when
compressing or releasing the valve spring with the valve

2008 Chevrolet Silverado 1500

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

7. Install J 44646 to the rocker arm bosses on the cylinder head. See Special Tools .

J 44646 should be installed in the rocker arm boss next to the cylinder being serviced. See
Special Tools . The pivot pin can be removed from the stand to allow the stand to be
installed. The lever has different locating holes for the pivot pin depending on available
clearance. The lever is also notched for different locations of the compressor.

8. Using J 44646 compress the valve spring. See Special Tools .

spring compressor and when removing or installing the
valve stem keys. Failing to use care may cause personal
injury.

2008 Chevrolet Silverado 1500

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

Fig. 209: View Of Valve Stem Oil Seal & Valve Spring
Courtesy of GENERAL MOTORS CORP.

9. Remove the valve keys (1) from the valve stem.

10. Carefully release the valve spring tension.

2008 Chevrolet Silverado 1500

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

11. Remove the valve spring upper seat (2) and the valve spring (3).

12. Remove the valve stem oil seal (4).

13. Remove the valve spring lower seat (5).

14. Continue removing the remaining valve stem seals for the cylinder using the above

procedure.

Installation Procedure

Fig. 210: Installing Valve Stem Using J 44640
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

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