Hummer H2. Manual — part 1688
engine RPM
engine RPM
Oil Pan
z
Front Cover Alignment - at Oil Pan Surface
0.0-0.5 mm
0.0-0.02 in
z
Rear Cover Alignment - at Oil Pan Surface
0.0-0.5 mm
0.0-0.02 in
z
Oil Pan Alignment - to Rear of Engine Block at
Transmission Bell Housing Mounting Surface
0.0-0.25 mm
0.0-0.01 in
Piston Rings
z
Piston Ring End Gap - First Compression Ring - Measured
in Cylinder Bore - Production
0.31-0.52 mm
0.012-0.02 in
z
Piston Ring End Gap - First Compression Ring - Measured
in Cylinder Bore - Service
0.31-0.59 mm
0.0122-0.023 in
z
Piston Ring End Gap - Second Compression Ring -
Measured in Cylinder Bore - Production
0.51-0.77 mm
0.02-0.03 in
z
Piston Ring End Gap - Second Compression Ring -
Measured in Cylinder Bore - Service
0.51-0.84 mm
0.02-0.033 in
z
Piston Ring End Gap - Oil Control Ring - Measured in
Cylinder Bore - Production
0.31-0.87 mm
0.0122-0.034 in
z
Piston Ring End Gap - Oil Control Ring - Measured in
Cylinder Bore - Service
0.31-0.94 mm
0.0122-0.037 in
z
Piston Ring to Groove Clearance - First Compression Ring
- Production
0.04-0.08 mm
0.00157-0.0031 in
z
Piston Ring to Groove Clearance - First Compression Ring
- Service
0.04-0.08 mm
0.00157-0.0031 in
z
Piston Ring to Groove Clearance - Second Compression
Ring - Production
0.039-0.079 mm
0.0015-0.0031 in
z
Piston Ring to Groove Clearance - Second Compression
Ring - Service
0.039-0.079 mm
0.0015-0.0031 in
z
Piston Ring to Groove Clearance - Oil Control Ring -
Production
0.015-0.199 mm
0.0006-0.0078 in
z
Piston Ring to Groove Clearance - Oil Control Ring -
Service
0.015-0.199 mm
0.0006-0.0078 in
Pistons and Pins
z
Piston - Piston Diameter - Measured Over Skirt Coating
101.606-101.640
mm
4.0002-4.0016 in
z
Piston - Piston to Bore Clearance - Production
-0.022 to +0.03
mm
-0.0009 to +0.0012
in
z
Piston - Piston to Bore Clearance - Service Limit with Skirt
Coating Worn Off
0.07 mm
0.0028 in
0.02-0.043 mm - 0.00078-0.00169
2004 Hummer H2
2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
z
Pin - First Design Press Fit Pin Fit in Connecting Rod Bore
Interference
in - Interference
z
Pin - First Design Press Fit Pin Clearance to Piston Pin
Bore - Production
0.01-0.02 mm
0.0004-0.00078 in
z
Pin - First Design Press Fit Pin Clearance to Piston Pin
Bore - Service
0.01-0.022 mm
0.0004-0.00086 in
z
Pin - First Design Press Fit Pin Diameter
23.997-24.0 mm
0.9447-0.9448 in
z
Pin - Second Design Full Floating Pin Fit in Connecting
Rod Bore - Production
0.007-0.02 mm
0.00027-0.00078
in
z
Pin - Second Design Full Floating Pin Fit in Connecting
Rod Bore - Service
0.007-0.022 mm
0.00027-0.00086
in
z
Pin - Second Design Full Floating Pin Clearance to Piston
Pin Bore - Production
0.002-0.01 mm
0.00008-0.0004 in
z
Pin - Second Design Full Floating Pin Clearance to Piston
Pin Bore - Service
0.002-0.015 mm 0.00008-0.0006 in
z
Pin - Second Design Full Floating Pin Diameter
23.952-23.955
mm
0.943-0.943 in
Valve System
z
Valves - Valve Face Angle
45 degrees
z
Valves - Valve Face Width
1.25 mm
0.05 in
z
Valves - Valve Lash
Net Lash - No Adjustment
z
Valves - Valve Lift - Intake
11.79 mm
0.464 in
z
Valves - Valve Lift - Exhaust
12.16 mm
0.479 in
z
Valves - Valve Seat Angle
46 degrees
z
Valves - Valve Seat Runout
0.05 mm
0.002 in
z
Valves - Valve Seat Width - Exhaust
1.78 mm
0.07 in
z
Valves - Valve Seat Width - Intake
1.02 mm
0.04 in
z
Valves - Valve Stem Diameter - Production
7.955-7.976 mm
0.313-0.314 in
z
Valves - Valve Stem Diameter - Service
7.95 mm
0.313 in
z
Valves - Valve Stem-to-Guide Clearance - Production -
Intake
0.025-0.066 mm
0.001-0.0026 in
z
Valves - Valve Stem-to-Guide Clearance - Service - Intake
0.093 mm
0.0037 in
z
Valves - Valve Stem-to-Guide Clearance - Production -
Exhaust
0.025-0.066 mm
0.001-0.0026 in
z
Valves - Valve Stem-to-Guide Clearance - Service -
Exhaust
0.093 mm
0.0037 in
z
Rocker Arms - Valve Rocker Arm Ratio
1.70:1
2004 Hummer H2
2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
SEALERS, ADHESIVES, AND LUBRICANTS
Sealers, Adhesives, and Lubricants
THREAD REPAIR SPECIFICATIONS
Engine Block - Front View
z
Valve Springs - Valve Spring Free Length
52.9 mm
2.08 in
z
Valve Springs - Valve Spring Installed Height
45.75 mm
1.8 in
z
Valve Springs - Valve Spring Load - Closed
340 N at 45.75
mm
76 lb at 1.8 in
z
Valve Springs - Valve Spring Load - Open
980 N at 33.55
mm
220 lb at 1.32 in
Application
Type of Material
GM Part Number
United States
Canada
Coolant Sensor Threads
Sealant
12346004
10953480
Cylinder Head Coolant Plugs
Threadlock
12345382
10953489
Cylinder Head Expansion Plugs - Aluminum
Threadlock
12345382
10953489
Engine Block Front Oil Gallery Plug
Threadlock
12345382
10953489
Engine Block Plug Sealing Washers
Sealant
12346004
10953480
Engine Flywheel Bolt Threads
Threadlock
12345382
10953489
Engine Oil
5W-30 Oil
12345610
993193
Engine Oil Supplement
Fluorescent Dye
12345795
10953470
Exhaust Manifold Bolt Threads
Threadlock
12345493
10953488
Fuel Rail Bolt Threads
Threadlock
12345382
10953489
Ignition Coil and Bracket Bolts
Threadlock
12345382
10953489
Ignition Coil Bracket Bolts
Threadlock
12345382
10953489
Intake Manifold Bolt Threads
Threadlock
12345382
10953489
Oil Pan Surface at Front and Rear Covers
Sealant
12378190
-
Oil Pressure Sensor Threads
Sealant
12346004
10953480
Thread Repair Component Cleaner
Cleaner
12346139
10953463
Thread Repair Component Cleaner
Cleaner
12377981
10953463
Thread Repair Cutting Oil
Lubricant
1052864
992881
2004 Hummer H2
2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
Fig. 1: Engine Block Bolt Holes - Front View
Courtesy of GENERAL MOTORS CORP.
Engine Block - Front View
Hole
Thread
Size
Insert
Drill
Counterbore
Tool
Tap
Driver
Drill Depth -
Maximum mm
(in)
Tap Depth -
Maximum mm
(in)
1-6
M8 x
1.25
J
42385-
210
J
42385-
206
J 42385-207
J
42385-
208
J
42385-
209
22.5 (0.885)
17.5 (0.688)
7
M10 x
1.5
J
42385-
215
J
42385-
211
J 42385-212
J
42385-
213
J
42385-
214
25.0 (0.984)
19.5 (0.767)
8
M10 x
1.5
J
42385-
215
J
42385-
211
J 42385-212
J
42385-
213
J
42385-
214
32.5 (1.28)
25.0 (0.984)
9
M8 x
1.25
J
42385-
210
J
42385-
206
J 42385-207
J
42385-
208
J
42385-
209
22.5 (0.885)
17.5 (0.688)
10
M10 x
J
42385-
J
42385-
J 42385-212
J
42385-
J
42385-
Thru
Thru
2004 Hummer H2
2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
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