Hummer H3. Manual — part 101

2. Remove the ignition coils. Refer to Ignition Coil(s) Replacement in Engine Controls -

3.5L (L52).

3. Disconnect the following electrical connectors from the camshaft cover:

The engine coolant temperature (ECT) sensor (1)

The fuel injector (2)

The heated oxygen sensor (HO2S) (5)

4. Remove the fuel pressure regulator screw, in order to gain clearance to remove the camshaft

cover.

Fig. 69: View Of Camshaft Cover
Courtesy of GENERAL MOTORS CORP.

2006 Hummer H3

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

5. Remove the camshaft cover bolts.

6. Remove the camshaft cover from the cylinder head.

7. Remove and discard the seals from the camshaft cover.

8. Clean and inspect the cylinder head sealing surface.

9. Clean and inspect the camshaft cover. Refer to Camshaft Cover Cleaning and

Inspection.

Installation Procedure

Fig. 70: View Of Camshaft Cover (Valve Cover)
Courtesy of GENERAL MOTORS CORP.

2006 Hummer H3

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

1. Install a NEW camshaft cover seal into the camshaft cover groove.

2. Install NEW ignition control module seals into the camshaft cover grooves.

3. Position the camshaft cover to the cylinder head.

4. Install the camshaft cover bolts.

Tighten: Tighten the bolts to 10 N.m (89 lb in).

5. Install the fuel pressure regulator screw.

Tighten: Tighten the screw to 8 N.m (71 lb in).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2006 Hummer H3

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

Fig. 71: View Of ECT Sensor, Fuel Injector, Ignition Coil & HO2S Engine Wiring
Harness Electrical Connectors
Courtesy of GENERAL MOTORS CORP.

6. Connect the following electrical connectors to the camshaft cover:

The ECT sensor (1)

The fuel injector (2)

The HO2S (5)

7. Install the ignition coils. Refer to Ignition Coil(s) Replacement in Engine Controls - 3.5L

(L52).

2006 Hummer H3

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