Chevrolet Silverado / GMC Sierra. Manual - part 225
Measured in Cylinder Bore - Service
Piston Ring-to-Groove Clearance - First
Compression Ring - Production
0.04-0.085 mm
0.00157-0.00335
in
Piston Ring-to-Groove Clearance - First
Compression Ring - Service
0.04-0.085 mm
0.00157-0.00335
in
Piston Ring-to-Groove Clearance - Second
Compression Ring - Production
0.04-0.078 mm
0.00157-0.0031 in
Piston Ring-to-Groove Clearance - Second
Compression Ring - Service
0.04-0.078 mm
0.00157-0.0031 in
Piston Ring-to-Groove Clearance - Oil Control
Ring - Production
0.012-0.2 mm
0.0005-0.0078 in
Piston Ring-to-Groove Clearance - Oil Control
Ring - Service
0.012-0.2 mm
0.0005-0.0078 in
Pistons and Pins
Pin - Piston Pin Clearance-to-Piston Pin Bore -
Production
0.002-0.01 mm
0.00008-0.0004 in
Pin - Piston Pin Clearance-to-Piston Pin Bore -
Service
0.002-0.015 mm 0.00008-0.0006 in
Pin - Piston Pin Diameter
23.952-23.955 mm
0.943-0.943 in
Pin - Piston Pin Fit in Connecting Rod Bore -
Production
0.007-0.02 mm
0.00027-0.00078
in
Pin - Piston Pin Fit in Connecting Rod Bore -
Service
0.007-0.022 mm
0.00027-0.00086
in
Piston - Piston Diameter - Measured Over
Coating
96.002-96.036 mm
3.779-3.78 in
Piston - Piston to Bore Clearance - Production
-0.036 to +0.016
mm
-0.0014 to
+0.0006 in
Piston - Piston to Bore Clearance - Service
Limit With Skirt Coating Worn Off
0.071 mm
0.0028 in
Valve System
Valves - Valve Face Angle
45 degrees
Valves - Valve Face Width
1.25 mm
0.05 in
Valves - Valve Lash
Net Lash - No Adjustment
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
SEALERS, ADHESIVES, AND LUBRICANTS
Valve Lift - Exhaust
12.72 mm
0.501 in
Valve Lift - Intake
12.72 mm
0.501 in
Valves - Valve Seat Angle
46 degrees
Valves - Valve Seat Runout
0.05 mm
0.002 in
Valves - Valve Seat Width - Exhaust
1.78 mm
0.07 in
Valves - Valve Seat Width - Intake
1.02 mm
0.04 in
Valves - Valve Stem Diameter - Production
7.955-7.976 mm
0.313-0.314 in
Valves - Valve Stem Diameter - Service
7.95 mm
0.313 in
Valves - Valve Stem-to-Guide Clearance -
Production - Exhaust
0.025-0.066 mm
0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance -
Service - Exhaust
0.093 mm
0.0037 in
Valves - Valve Stem-to-Guide Clearance -
Production - Intake
0.025-0.066 mm
0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance -
Service - Intake
0.093 mm
0.0037 in
Rocker Arms - Valve Rocker Arm Ratio
1.70:1
Valve Springs - Valve Spring Free Length
52.9 mm
2.08 in
Valve Springs - Valve Spring Installed Height
45.75 mm
1.8 in
Valve Springs - Valve Spring Load - Closed
340 N at 45.75
mm
76 lb at 1.8 in
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 Temperature Sensor Threads
Sealant
12346004
10953480
Cylinder Head Core Hole Plug
Threadlock
12345382
10953489
Cylinder Head Plug
Threadlock
12345382
10953489
Engine Block Coolant Drain Hole Plug
Sealant
12346004
10953480
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
THREAD REPAIR SPECIFICATIONS
Engine Block - Front/Rear Views
Sealing Washer
Engine Block Front Oil Gallery Plug
Threadlock
12345382
10953489
Engine Block Oil Gallery Plug Sealing
Washers
Sealant
12346004
10953480
Engine Oil Pressure Sensor Threads
Sealant
12346004
10953480
Engine Oil Supplement
Fluorescent Dye
12345795
10953470
Exhaust Manifold Bolts
Threadlock
12345493
10953488
Flywheel/Flex Plate Bolts
Threadlock
12345382
10953489
Fuel Injection Fuel Rail Bolts
Threadlock
12345382
10953489
Ignition Coil Bracket-to-Valve Cover
Studs
Threadlock
12345382
10953489
Ignition Coil-to-Bracket Bolts
Threadlock
12345382
10953489
Intake Manifold Bolts
Threadlock
12345382
10953489
Oil Pan Oil Gallery Plug Threads
Sealant
12346004
10953480
Oil Pan Surface at Front Cover and Rear
Housing
Sealant
12378521
88901148
Thread Repair Component Cleaner
Cleaner
12346139
10953463
Thread Repair Component Cleaner
Cleaner
12377981
10953463
Thread Repair Cutting Oil
Lubricant
1052864
992881
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 1: Engine Block - Front/Rear Views
Courtesy of GENERAL MOTORS CORP.
Engine Block - Left/Right Side Views
Hole
Thread
Size
Insert
Drill
Counterbore
Tool
Tap
Driver
Drill
Depth -
Maximum
mm (in)
Tap Depth
-
Maximum
mm (in)
J 42385-
1
M8 x
1.25
210
206
207
208
209
22.5
(0.885)
17.5
(0.688)
2
M10 x
1.5
215
211
212
213
214
27.5 (1.08)
22.0
(0.866)
3
M10 x
1.5
215
211
212
213
214
Thru
Thru
4
M8 x
1.25
210
206
207
208
209
Thru
Thru
5
M10 x
1.5
215
211
212
213
214
25.0
(0.984)
19.5
(0.767)
6
M10 x
1.5
215
211
212
213
214
32.5
(1.279)
25.0
(0.984)
7
M10 x
1.5
215
211
212
213
214
Thru
Thru
Bolt hole 6 is drilled and tapped for aluminum block applications only.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2