Hummer H3. Manual — part 315

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

36. Reposition the exhaust manifold to cylinder head and install the exhaust manifold bolts to

the cylinder head. Refer to Exhaust Manifold Replacement .

37. If equipped, install a NEW AIR injection gasket, then the cover and pipe studs to the

cylinder head.

Tighten: Tighten the pipe studs to 25 N.m (18 lb ft).

38. Install the exhaust manifold heat shield to the exhaust manifold.

39. Apply anti-seize GM P/N 12371386 (Canadian P/N 89021945) to the exhaust manifold heat

shield nuts.

40. Install the exhaust manifold heat shield nuts.

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

41. Install the intake manifold to the cylinder head. Refer to Intake Manifold Replacement.

42. Reposition the engine wiring harness bracket to the engine and harnesses. Install the engine

wiring harness bracket bolts.

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

43. Install the left front wheelhouse panel and the left wheel and tire. Refer to Wheelhouse

Panel Replacement (Front) or Wheelhouse Panel Replacement (Rear) .

44. Drain the engine oil again.

45. If removed, install the radiator outlet hose. Refer to Radiator Outlet Hose Replacement

(LLR) .

46. Install the oil pan skid plate and the engine shield. Refer to Oil Pan Skid Plate

Replacement .

47. Install the engine shield.

48. Lower the vehicle.

49. Install the cross-vehicle wiring harness connectors to the following components:

PCM

Map sensor

Ignition coils

Harness clamps at power steering pump

Wiring harness fastener at right front inner fender

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Throttle body

Camshaft sensors

Exhaust camshaft actuator

Fuel injectors

HO2S 1

50. Install the windshield washer solvent container and coolant recovery reservoir bolts to the

right inner fender.

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

51. Install the PCV pipes to the intake manifold. Refer to Crankcase Ventilation Hoses/Pipes

Replacement.

52. Reposition the oil indicator (dipstick) tube and tighten the bolt to the intake manifold. Refer

to Oil Level Indicator and Tube Replacement.

53. Reposition the Fuel/EVAP lines to the intake manifold retainer. Refer to Evaporative

Emission Hoses/Pipes Replacement - Engine .

54. Install the following components:

Generator-Refer to Generator Replacement .

A/C compressor hose/pipe bracket clamp for the engine lift bracket-Refer to Engine
Lift Bracket Replacement.

Drive belt-Refer to Drive Belt Replacement (Without A/C) or Drive Belt
Replacement (With A/C).

55. Install the battery. Refer to Battery Replacement .

56. Install the air induction assembly. Refer to Air Cleaner Resonator and Outlet Duct

Replacement and Air Cleaner Assembly Replacement .

57. Install NEW engine oil. Refer to Engine Mechanical Specifications.

58. Install NEW coolant. Refer to Cooling System Draining and Filling (Static Fill) or

Cooling System Draining and Filling (Vac-N-Fill) .

59. Install a scan tool and start the engine.

Check for DTCs.

Road test the vehicle. DTC P0017 is a Type B diagnostic code. Three consecutive
ignition key cycles must be performed during the road test with a minimum of a one
minute run time between key cycles to verify that a DTC P0017 did not set. For
further information on DTC P0017, refer to DTC P0017 .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

CRANKSHAFT BALANCER REPLACEMENT

Tools Required

J 41816-2 Crankshaft Balancer Puller. See Special Tools.

EN 46547 Flywheel Holding Tool. See Special Tools.

J 41478 Crankshaft Balancer Installer. See Special Tools.

J 41816-2 Crankshaft End Protector. See Special Tools.

J 45059 Angle Meter. See Special Tools.

Removal Procedure

1. Remove the drive belt. Refer to Drive Belt Replacement (Without A/C) or Drive Belt

Replacement (With A/C).

2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 127: View Of Service Slot Plug
Courtesy of GENERAL MOTORS CORP.

3. Remove the service slot plug.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3