Hummer H3. Manual — part 326

9. Install the exhaust camshaft actuator onto the exhaust camshaft.

Fig. 163: Identifying Exhaust Camshaft Position Actuator Bolt
Courtesy of GENERAL MOTORS CORP.

10. Install a NEW exhaust camshaft actuator bolt.

IMPORTANT:

To aid in aligning the actuator 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

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Tighten: Tighten the bolt a first pass to 25 N.m (18 lb ft). Using the J 45059 rotate the bolt
a final pass an additional 135 degrees. See Special Tools.

Fig. 164: View Of Tee At Timing Chain Tensioner
Courtesy of GENERAL MOTORS CORP.

11. Remove the tee in the timing chain tensioner in order to regain tension on the timing chain.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 165: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.

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

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 166: Identifying Chain Alignment Links
Courtesy of GENERAL MOTORS CORP.

13. The dark links (1) on the timing chain should be aligned with the marks on the sprockets as

shown.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3