Hummer H3. Manual — part 288

Fig. 29: Scribing Or Drawing a Line
Courtesy of GENERAL MOTORS CORP.

2. Scribe or draw a line (1) on the camshaft position actuator outer ring face, in the full

advanced position.

3. Apply compressed air pressure to the oil port (1) on the back side of the actuator to unlock

the locking pin.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 30: Ensuring Wording Is Level
Courtesy of GENERAL MOTORS CORP.

4. Turn the actuator, by hand, to the full counterclockwise position.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 31: Scribing Or Drawing 2nd Line
Courtesy of GENERAL MOTORS CORP.

5. Scribe or draw a line (2) on the camshaft position actuator at that position.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 32: Measure Distance Between The Two Lines
Courtesy of GENERAL MOTORS CORP.

6. Measure the distance between the two lines. The measurement (3) should be 14-15 mm

(0.55-0.59 in).

IMPORTANT: It is normal for oil and air to leak out of the camshaft actuator

when compressed air is applied. It is also normal for oil
bubbles to form on the camshaft sprocket surface due to
porosity caused by the casting process. Do not replace the
actuator due to this leakage.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3