Hummer H3. Manual — part 323

sprocket.

2. Install the intake camshaft sprocket onto the intake camshaft.

3. Install a NEW intake camshaft sprocket bolt.

Tighten: Tighten the bolt a first pass to 20 N.m (15 lb ft). Using the J 45059 rotate the bolt
a final pass an additional 100 degrees. See Special Tools.

IMPORTANT:

To aid in aligning the sprocket to the camshaft, use a 25
mm (1 in) wrench on the hex of the camshaft to rotate

Ensure the alignment pin is properly engaged with the
camshaft

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 153: View Of J 44217 & EN-44217-45 At Timing Chains
Courtesy of GENERAL MOTORS CORP.

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

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 154: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.

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

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

Intake .

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

TIMING CHAIN AND SPROCKET REPLACEMENT

Tools Required

J 44221 Camshaft Holding Tool. See Special Tools.

J 45059 Angle Meter. See Special Tools.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Removal Procedure

1. Remove the #1 cylinder spark plug. Refer to Spark Plug Replacement .

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

3. Remove the exhaust camshaft position (CMP) sensor. Refer to Camshaft Position Sensor

Replacement - Exhaust .

4. Remove the intake CMP sensor. Refer to Camshaft Position Sensor Replacement -

Intake .

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

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

top dead center (TDC) on the compression stroke.

Fig. 155: View Of J 44221 Installed On Camshafts

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3