Hummer H3. Manual — part 249

Fig. 612: Installing Timing Chain & Sprockets
Courtesy of GENERAL MOTORS CORP.

2. Compress the tensioner and lock in place.

3. Install the crankshaft sprocket.

4. Install the intake camshaft sprocket into the timing chain.

5. Align the (dark) link of the timing chain with the timing mark on the intake camshaft

sprocket (1).

6. Feed the timing chain down through the opening in the head.

7. Install the timing chain onto the crankshaft sprocket. Align the (dark) link of the timing

chain with the timing mark on the crankshaft sprocket (2).

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

8. Install the intake camshaft sprocket onto the intake camshaft.

Fig. 613: View Of Intake Camshaft Sprocket Washer & Bolt
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: It may be necessary to remove J 44221 to rotate and hold the

camshaft (hex) to align the pin to the camshaft sprocket. See
Special Tools.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

9. Install the intake camshaft sprocket washer and new bolt.

Tighten:

Tighten the new intake camshaft sprocket bolt the first pass to 20 N.m (15 lb ft).

Use J 45059 to tighten the intake camshaft sprocket bolt the final pass an additional
100 degrees. See Special Tools.

10. Install the exhaust camshaft actuator into the timing chain.

11. Align the (dark) link of the timing chain with the timing mark on the exhaust camshaft

actuator (1).

12. Install the exhaust camshaft actuator onto the exhaust camshaft.

IMPORTANT: It may be necessary to remove J 44221 to rotate and hold the

camshaft (hex) to align the pin to the camshaft sprocket. See
Special Tools.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 614: Exhaust Camshaft Actuator
Courtesy of GENERAL MOTORS CORP.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3