Hummer H3. Manual — part 327

14. Install the engine front cover. Refer to Engine Front Cover Replacement.

15. Install the intake CMP sensor. Refer to Camshaft Position Sensor Replacement -

Intake .

16. Install the exhaust CMP sensor. Refer to Camshaft Position Sensor Replacement -

Exhaust .

17. Install the camshaft cover. Refer to Camshaft Cover Replacement.

18. Install #1 cylinder spark plug. Refer to Spark Plug Replacement .

TIMING CHAIN TENSIONER REPLACEMENT

Tools Required

J 44221 Camshaft Holding Tool. See Special Tools.

Removal Procedure

1. Remove the camshaft cover. Refer to Camshaft Cover Replacement.

2. Remove the engine front cover. Refer to Engine Front Cover Replacement.

3. Rotate the crankshaft in the engine rotational direction clockwise, until the #1 piston is at

top dead center (TDC) on the compression stroke.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 167: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.

4. Install the J 44221 to the rear of the camshafts. See Special Tools.

CAUTION: Refer to Camshaft Holding Tool Caution .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 168: Identifying Chain Alignment Links
Courtesy of GENERAL MOTORS CORP.

5. Using the timing marks on the following as a reference, make a mark on the timing chain

links (1) adjacent to them:

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

The exhaust camshaft position actuator sprocket

The Intake camshaft sprocket

The crankshaft sprocket

Fig. 169: Releasing Timing Chain Tension
Courtesy of GENERAL MOTORS CORP.

6. Release the tension on the timing chain by moving the tensioner shoe in.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3