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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 3.7L >> Specifications >> Engine Mechanical Specifications
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Engine Mechanical Specifications

Application Specifications
Metric English
General
  • Engine Type
In-Line-5
  • Displacement
3.7L 223 cu in
  • RPO
LLR
  • VIN
E
  • Bore
95.5 mm 3.76 in
  • Stroke
102 mm 4.02 in
  • Compression Ratio
10.3:1
  • Engine Compression Test
1482 kPa 215 psi
  • Firing Order
1-3-5-4-2
  • Spark Plug Gap
1.14-1.25 mm 0.044-0.050 in
Block
  • Crankshaft Main Bearing Bore Diameter
78.070-78.088 mm 3.0760-3.0766 in
  • Cylinder Bore Diameter
95.490-95.506 mm 3.7623-3.7629 in
  • Cylinder Bore Out-of-Round
0.013 mm 0.0005 in
  • Cylinder Head Deck Surface Flatness
0.08 mm 0.003 in
  • Cylinder Sleeve Recession
0.015 mm 0.0006 in
Camshaft
  • Camshaft End Play - Exhaust
0.045-0.215 mm 0.0017-0.0084 in
  • Camshaft End Play - Intake
0.051-0.201 mm 0.0020-0.0079 in
  • Camshaft Journal Diameter - All Intake and Exhaust #2-#7
26.936-26.960 mm 1.0612-1.0622 in
  • Camshaft Journal Diameter - Exhaust #1
29.936-29.960 mm 1.1794-1.1804 in
  • Camshaft Journal to Bore Clearance
0.040-0.085 mm 0.0015-0.0033 in
Connecting Rod
  • Connecting Rod Bearing Clearance
0.021-0.065 mm 0.0008-0.0025 in
  • Connecting Rod Bore Diameter - Bearing End
60.332-60.338 mm 2.3749-2.3755 in
  • Connecting Rod Bore Out-of-Round - Bearing End
0.006 mm 0.0002 in
Connecting Rod Side Clearance 0.05-0.35 mm 0.0019-0.0137 in
Crankshaft
  • Crankshaft End Play
0.112-0.388 mm 0.0044-0.0153 in
  • Crankshaft Main Bearing Clearance
0.012-0.064 mm 0.0004-0.0025 in
  • Crankshaft Main Journal Diameter
69.968-69.984 mm 2.7567-2.7574 in
  • Crankshaft Main Journal Out-of-Round
0.005 mm 0.0002 in
  • Crankshaft Main Journal Taper
0.005 mm 0.0002 in
  • Crankshaft Rod Journal Diameter
56.7 mm 2.234 in
Cylinder Head
  • Surface Flatness - Block Deck
0.08 mm 0.003 in
  • 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
Pistons and Pins
  • Piston - Piston Diameter
95.573-95.588 mm 3.7627-3.7633 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