Hummer H3. Manual — part 321

3. Install the exhaust camshaft actuator onto the exhaust camshaft.

Fig. 146: Identifying Exhaust Camshaft Position Actuator
Courtesy of GENERAL MOTORS CORP.

4. Install a NEW exhaust camshaft actuator bolt.

Tighten: Tighten the bolt a first pass to 25 N.m (18 lb ft). Using the J 45059 rotate the bolt

camshaft

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

a final pass an additional 135 degrees. See Special Tools.

Fig. 147: View Of J 44217 & EN-44217-45 At Timing Chains
Courtesy of GENERAL MOTORS CORP.

5. Remove the J-44217-45 (1). See Special Tools.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 148: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.

6. Remove the J 44221 from the camshafts. See Special Tools.

7. Install the CMP sensor. Refer to Camshaft Position Sensor Replacement - Intake .

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

Exhaust .

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

CAMSHAFT INTAKE SPROCKET REPLACEMENT

Tools Required

J-44217-45 Chain Holding Tool. See Special Tools.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

J 44221 Camshaft Holding Tool. See Special Tools.

J 45059 Angle Meter. See Special Tools.

Removal Procedure

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

2. Remove the intake camshaft position (CMP) sensor. Refer to Camshaft Position Sensor

Replacement - Intake .

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

top dead center (TDC) on the compression stroke.

4. Using the timing mark on the intake camshaft sprocket as a reference, make a mark on the

timing chain link adjacent to it.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3