Chevrolet Silverado / GMC Sierra. Manual — part 52

7. Using J 5892-D compress the valve spring. See Special Tools.

1. Hook the slotted end of J 5892-D under the washer on the rocker arm bolt. See

Special Tools.

2. Apply steady pressure on the valve spring cap until the valve keys are accessible.

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
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 - 4.3L - Sierra & Silverado

Fig. 149: Compressing Valve Spring (Cylinder Head Installed) Using Special Tools
Courtesy of GENERAL MOTORS CORP.

8. Use J 38606 when J 5892-D will not fit. See Special Tools.

NOTE:

Completely engage the J 38606 jaws on the valve spring. The J
38606 may slip off and scratch the valve spring. Replace the
valve spring if the valve spring becomes scratch.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 150: Identifying Valve Components
Courtesy of GENERAL MOTORS CORP.

9. Remove the valve keys (1).

10. Carefully release the valve spring tension.

11. Remove the J 5892-D or the J 38606 . See Special Tools.

12. Remove the valve spring cap (2) and valve spring (3).

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

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Installation Procedure

Fig. 151: Exhaust Valve Oil Stem Seal
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The exhaust valve oil stem seal has the letters EX (1) molded

into the top of the seal. The exhaust valve oil stem seal
material is brown in color (2) with a white stripe (3) painted
onto the outside diameter of the seal, or the material may be
red in color (2) with no paint stripe. The intake valve oil seal
is black in color.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado