Hummer H3. Manual — part 103

J 44228 Valve Spring Compressor. See Special Tools.

Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General

Information.

Fig. 76: View Of Service Slot Plug
Courtesy of GENERAL MOTORS CORP.

2. Remove the service slot plug.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 77: Identifying EN 46547
Courtesy of GENERAL MOTORS CORP.

3. Install the EN 46547 (1) into the flywheel teeth. See Special Tools.

4. Lower the vehicle.

5. Remove the valve rocker arms. Refer to Valve Rocker Arm and Valve Lash Adjuster

Replacement.

6. Remove the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 3.5L

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

(L52).

Fig. 78: View Of J 44228 Base Plate
Courtesy of GENERAL MOTORS CORP.

7. Install the base plate of the J 44228 over the spark plug hole of the cylinder to be serviced.

See Special Tools.

8. Install the J 39313 in the spark plug hole. See Special Tools.

9. Apply constant air pressure to the J 39313 in order to keep the valve closed. See Special

Tools.

10. Install the arm and swivel nut of the J 44228 over the stud corresponding to the valve to be

serviced. See Special Tools.

CAUTION: Compressed valve springs have high tension against the

valve spring compressor. Valve springs that are not

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

11. Tighten the swivel nut of the J 44228 down only enough to allow access for removal of the

valve locks. See Special Tools.

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

12. Remove the valve locks. A magnet is the most suitable tool for this activity.

13. Loosen the swivel nut of the J 44228 and swing the arm away from the valve spring

retainer. See Special Tools.

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.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3