Hummer H3. Manual — part 305

18. Remove the generator output BAT terminal nut.

19. Remove the generator lead from the generator.

20. Disconnect the generator electrical connector.

21. Remove the generator bolts and set the generator aside. Refer to Generator Replacement .

22. Disconnect the A/C pipe clamp from the engine lift hook bracket.

23. Remove the engine lift hook bracket bolts and bracket from the vehicle.

24. Remove the bolts holding the windshield washer solvent container and coolant recovery

reservoir to the right inner fender. Move aside to gain access to the engine wiring harness to
the powertrain control module (PCM). Refer to Washer Solvent Container Replacement
(Prior to VIN 78135604) or Washer Solvent Container Replacement (Base) or
Washer Solvent Container Replacement (Post VIN 78135604) .

25. Disconnect the following cross-vehicle engine wiring harness connectors:

PCM

Engine coolant temperature sensor

Manifold absolute pressure (MAP) sensor

Ignition coils

Harness clamps at power steering pump

Wiring harness fastener at right front inner fender

Throttle body

Camshaft sensors

Exhaust camshaft actuator

Fuel injectors

HO2S 1

Set aside the cross-vehicle engine wiring harness on the left side of the vehicle.

26. If equipped, remove the secondary air injection (AIR) injection pipe block-off plate bolts

from the cylinder head.

27. If equipped, remove the AIR injection pipe block-off plate.

IMPORTANT: The generator does not have to be removed from the vehicle.

On a two-wheel drive vehicle, the generator must be removed
from the vehicle.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 89: View Of Exhaust Manifold Heat Shield
Courtesy of GENERAL MOTORS CORP.

28. Remove the bolts from the exhaust manifold heat shield.

29. Remove the exhaust manifold heat shield.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 90: View Of Exhaust Manifold
Courtesy of GENERAL MOTORS CORP.

30. Remove the exhaust manifold bolts.

31. Move the exhaust manifold back and away from the cylinder head.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 91: View Of Ignition Control Module
Courtesy of GENERAL MOTORS CORP.

32. Remove the bolts to all ignition coil assemblies and remove all ignition coil assemblies from

the cam cover.

33. Remove all the spark plugs from the cylinder head.

34. Remove the cam cover from the cylinder head. Refer to Camshaft Cover Replacement.

35. Remove the inlet radiator hose and clamp from the cylinder head. Refer to Radiator Inlet

Hose Replacement (LLR) .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3