Hummer H3. Manual — part 334

Fig. 192: View Of Cylinder Head Access Hole Plugs
Courtesy of GENERAL MOTORS CORP.

3. Install the cylinder head access hole plug.

Tighten: Tighten the plug to 5 N.m (44 lb in).

4. Install the crankshaft sprocket to the crankshaft sprocket snout.

Aligning the marked link on the timing chain with the timing mark on the crankshaft

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

sprocket.

5. Install the timing chain tensioner shoe. Refer to Timing Chain Tensioner Shoe

Replacement.

CAMSHAFT REPLACEMENT

Tools Required

J 44221 Camshaft Holding Tool. See Special Tools.

J 44222 Camshaft Sprocket 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 exhaust camshaft position (CMP) sensor. Refer to Camshaft Position Sensor

Replacement - Exhaust .

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

Intake .

4. 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. 193: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.

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

6. Remove and discard the intake and the exhaust camshaft sprocket bolts.

CAUTION: Refer to Camshaft Holding Tool Caution .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 194: View Of J 44222 Installed Onto Cylinder Head
Courtesy of GENERAL MOTORS CORP.

7. Install the J 44222 onto the cylinder head and adjust the horizontal bolts into the camshaft

sprockets in order to maintain chain tension and keep from disturbing the timing chain
components. See Special Tools.

8. Carefully slide the sprockets with the timing chain from the camshafts to the J 44222 . See

Special Tools.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3