Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008COLORADO 2WD L5-3.7LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER BLOCK ASSEMBLYSPECIFICATIONS
2008 Chevrolet Colorado 2WD L5-3.7L
Cylinder Block Assembly: Specifications
2008 Chevrolet Colorado 2WD L5-3.7LSECTION Specifications
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
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
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 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
Connecting Rod Cap Bolt
First Pass 25 N.m 18 lb ft
Final Pass 110 degrees
Crankshaft Balancer Bolt
First Pass 150 N.m 110 lb ft
Final Pass 180 degrees
Crankshaft Main Bearing Cap Bolt
First Pass 25 N.m 18 lb ft
Final Pass 180 degrees
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
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
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 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
Connecting Rod Cap Bolt
First Pass 25 N.m 18 lb ft
Final Pass 110 degrees
Crankshaft Balancer Bolt
First Pass 150 N.m 110 lb ft
Final Pass 180 degrees
Crankshaft Main Bearing Cap Bolt
First Pass 25 N.m 18 lb ft
Final Pass 180 degrees
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.