Hummer H3. Manual — part 271

Surface Flatness - Exhaust Manifold
Deck

0.08 mm

0.003 in

Surface Flatness - Intake Manifold
Deck

0.08 mm

0.003 in

Exhaust Manifold

Surface Flatness

0.08 mm

0.003 in

Lubrication System

Oil Capacity - with Filter

5.6 L

6.0 qts

Oil Capacity - without Filter

5.1 L

5.5 qts

Oil Pressure - Minimum

85 kPa

12 psi at 1200 RPM

Oil Pump

Gear Diameter - Drive

73.415-73.370 mm

2.893-2.891 in

Gear Diameter - Driven

87-86.975 mm

3.428-3.426 in

Gear Pocket - Depth

15.609-15.584 mm

0.615-0.614 in

Gear Pocket - Diameter

87.065-87.040 mm

3.430-3.429 in

Gear Thickness - Drive

15.546-15.521 mm

0.613-0.611 in

Gear Thickness - Driven

15.360-15.511 mm

0.605-0.611 in

Lobe Inner Diameter - Maximum

11.9 mm

0.469 in

Relief Valve-to-Bore Clearance

2.57-1.63 mm

0.101-0.064 in

Piston Rings

Piston Ring End Gap - First
Compression Ring

0.2-0.4 mm

0.0079-0.0157 in

Piston Ring End Gap - Second
Compression Ring

0.36-0.51 mm

0.0142-0.0201 in

Piston Ring End Gap - Oil Control
Ring

0.250-0.760 mm

0.0098-0.0299 in

Piston Ring to Groove Clearance - First
Compression Ring

0.043-0.093 mm

0.0017-0.0037 in

Piston Ring to Groove Clearance -
Second Compression Ring

0.053-0.093 mm

0.0021-0.0037 in

Piston Ring to Groove Clearance - Oil
Control Ring

0.059-0.215 mm

0.0023-0.0085 in

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

SEALERS, ADHESIVES AND LUBRICANTS

Sealers, Adhesives and Lubricants

Pistons and Pins

Piston - Piston Diameter

92.963-92.977 mm

3.6627-3.6633 in

Piston - Piston Pin Bore Diameter

23.002-23.008 mm

0.9056-0.9058 in

Piston - Piston to Bore Clearance

0.013-0.043 mm

0.0004-0.0017 in

Pin - Piston Pin Clearance to
Connecting Rod Bore

0.001-0.018 mm

0.0004-0.0007 in

Pin - Piston Pin Clearance to Piston Pin
Bore

0.003-0.012 mm

0.00012-0.0005 in

Pin - Piston Pin Diameter

22.996-22.999 mm

0.9054-0.9055 in

Valve System

Valves - Valve Face Runout

0.038 mm

0.0015 in

Valves - Valve Seat Runout

0.05 mm

0.002 in

Valves - Valve Stem-to-Guide
Clearance - Exhaust

0.0375-0.0775 mm

0.0015-0.0030 in

Valves - Valve Stem-to-Guide
Clearance - Intake

0.030-0.065 mm

0.0011-0.0025 in

Valve Springs - Valve Spring Load -
Closed

211-233 N at 35 mm

47.4-52.4 lb at 1.379

in

Valve Springs - Valve Spring Load -
Open

578-632 N at 24.5 mm 130-142 lb at 0.965 in

Application

Type of Material

GM Part Number

United

States

Canada

Camshaft Position Actuator Bolt

Sealant

89021297

10953488

Camshaft Position Sensor Bolt

Sealant

12378521

88901148

Coolant Sensor Threads

Sealant

12378521

88901148

Crankshaft Position Sensor Bolt

Sealant

12378521

88901148

Cylinder Head Core Hole Plugs

Sealant

12378521

88901148

Cylinder Head Expansion Plugs
(Aluminum)

Sealant

12378521

88901148

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

THREAD REPAIR SPECIFICATIONS

Engine Block - Top View

Fig. 1: Engine Block - Top View

Engine Block Front Oil Gallery Plug

Sealant

12378521

88901148

Engine Block Plug

Sealant

12378521

88901148

Engine Front Cover Surface

Sealant

12378521

88901148

EVAP Purge Solenoid Valve Bolt

Sealant

12378521

88901148

Exhaust Manifold Bolt Threads

Threadlock

89021297

10953488

Exhaust Manifold Heat Shield Nuts

Anti-Sieze

12371386

993128

Oil Level Indicator Tube Stud

Sealant

12378521

88901148

Oil Pan Surface

Sealant

12378521

88901148

Oil Pressure Sensor Threads

Sealant

12378521

88901148

Oil Pump Pipe Bolt

Sealant

12378521

88901148

PVC Hose

Lubricant

12345884

5728223

Rear Oil Seal Housing Surface

Sealant

12378521

88901148

Throttle Control Module Bolt

Sealant

12345382

10953489

Timing Chain Guide Bolt

Threadlock

89021297

10953488

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Courtesy of GENERAL MOTORS CORP.

Engine Block - Top View

Engine Block - Bottom View

Fig. 2: Engine Block - Bottom View
Courtesy of GENERAL MOTORS CORP.

Engine Block - Bottom View

Service

Hole

Location

Thread

Size

Drill

Counterbore

Tool

Stop

Collar Tap Driver Insert

Drill

Depth
(Max)

Tap

Depth

(Min)

J 42385-400 . See Special Tools.

mm (in) mm (in)

1

M 11 x

2

402

n/a

n/a

403

404

108

59 2.324 51 2.009

2

M 6 x 1 201

202

n/a

203

204

205

22 0.866 18 0.709

3

M 6 x 1 201

202

n/a

203

204

205

30 1.182 26 1.024

Service

Hole Thread

Counterbore Stop

Drill Depth

Tap

Depth

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3