Hummer H3. Manual — part 335

Fig. 195: View Of Camshaft Caps
Courtesy of GENERAL MOTORS CORP.

9. Alternately loosen the camshaft cap bolts a few turns at a time until all valve spring pressure

has been released.

10. Remove the camshaft caps.

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

IMPORTANT: Place the camshaft caps in a rack to ensure the caps are

installed in the same location from which they were removed.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 196: View Of Camshafts
Courtesy of GENERAL MOTORS CORP.

12. Remove the camshafts from the cylinder head.

13. Clean and inspect the camshafts. Refer to Camshafts Cleaning and Inspection.

Installation Procedure

1. Coat the camshaft journals, camshaft journal thrust face and camshaft lobes with clean

engine oil.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 197: Installing J 44221 To Camshafts
Courtesy of GENERAL MOTORS CORP.

2. Install the J 44221 with the camshaft flats up and the #1 piston at TDC. See Special Tools.

3. Install the intake and exhaust camshafts to their original positions.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 198: Identifying Camshaft Bearing Cap Markings
Courtesy of GENERAL MOTORS CORP.

4. Observe the markings on the camshaft caps. Each camshaft cap is marked in order to

identify its location. The markings have the following meanings:

The arrow should point to the front of the engine

The number indicates the position from the front of the engine

The "E" indicates the exhaust camshaft.

The "I" indicates the intake camshaft.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3