Hummer H3. Manual — part 302

Fig. 78: View Of Valve Stem Seals
Courtesy of GENERAL MOTORS CORP.

15. Use the J 38820 in order to grip the seal. See Special Tools. Remove the seal by exerting a

twisting, pulling motion.

Discard the old valve stem seal.

Installation Procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 79: View Of Valve Stem Seals
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the valve stem and inner diameter of the new seal with clean engine oil.

2. Using a twisting, pushing motion install the NEW valve stem seal using the J 38820 . See

Special Tools.

IMPORTANT: Install a seal protector over the valve stem prior to installing

the valve stem seal.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 80: View Of Valve Springs & Retainers
Courtesy of GENERAL MOTORS CORP.

3. Install the valve spring and valve spring retainer.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 81: View Of J 44228 Base Plate
Courtesy of GENERAL MOTORS CORP.

4. Swing the arm over the valve spring retainer and tighten the swivel nut of the J-44228-A

down only enough to allow access for installation of the valve locks.

5. Position the valve locks to the valve stem retainer groove using the J 43059 .

6. Remove the swivel nut and arm of the J-44228-A

7. Install the arm and swivel nut of the J-44228-A over the stud of any other valves being

serviced for this cylinder and repeat removal steps 11 through 16 and installation steps 1
through 7.

8. Relieve the air pressure to the cylinder being serviced.

9. Remove the J 39313 from the spark plug hole. See Special Tools.

10. Remove the base plate of the J-44228-A .

11. Repeat removal steps 7 through 16 and installation steps 1 through 10 on any other cylinders

being serviced.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3