Hummer H3. Manual — part 451

Fig. 624: View Of Cylinder Head Bolts
Courtesy of GENERAL MOTORS CORP.

4. Install new cylinder head bolts.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 625: Installing Cylinder Head Bolts
Courtesy of GENERAL MOTORS CORP.

5. Tighten the new cylinder head bolts in the following sequence:

Tighten:

1. Tighten the (12) long cylinder head bolts in sequence to 30 N.m (22 lb ft).

2. Use J 45059 to tighten the cylinder head bolts in sequence an additional 155 degrees.

See Special Tools.

NOTE:

Refer to FASTENER NOTICE .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

3. Tighten the (2 Short) end bolts to 7 N.m (62 lb in).

Use J 45059 to tighten the short cylinder head end bolts an additional 60 degrees. See
Special Tools.

4. Tighten the (1 Long) end bolt to 7 N.m (62 lb in).

Use J 45059 to tighten the long cylinder head end bolt an additional 120 degrees. See
Special Tools.

VALVE ROCKER ARM AND VALVE LASH ADJUSTER INSTALLATION

Fig. 626: View Of Valve Lash Adjusters
Courtesy of GENERAL MOTORS CORP.

1. Lubricate and fill the valve lash adjusters with engine oil.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

2. Install the valve lash adjusters in their original locations.

Fig. 627: View Of Valve Rocker Arms
Courtesy of GENERAL MOTORS CORP.

3. Lubricate the valve rocker arm.

4. Install the valve rocker arms in their original locations.

CAMSHAFT INSTALLATION

Tools Required

J 44221 Camshaft Holding Tool. See Special Tools.

Installation Procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3