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.
2003 Hummer H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE
Connecting Rod, Engine
FASTENER TIGHTENING SPECIFICATIONS
Connecting Rod Bolts - First Pass 20 N.m (15 lb ft)
Connecting Rod Bolts - Final Pass 75 degrees
ENGINE MECHANICAL SPECIFICATIONS
Connecting Rod Bearing Clearance Production 0.023-0.065 mm (0.0009-0.0025 in)
Connecting Rod Bearing Clearance - Service 0.023-0.076 mm (0.0009-0.003 in)
Connecting Rod Bore Diameter - Bearing End 56.505-56.525 mm (2.224-2.225 in)
Connecting Rod Bore Out-of-Round - Bearing End - Production 0.006 mm (0.0002 in)
Connecting Rod Bore Out-of-Round - Bearing End - Service 0.006 mm (0.0002 in)
Connecting Rod Side Clearance 0.11-0.51 mm (0.00433-0.02 in)
Connecting Rod Bolts - First Pass 20 N.m (15 lb ft)
Connecting Rod Bolts - Final Pass 75 degrees
ENGINE MECHANICAL SPECIFICATIONS
Connecting Rod Bearing Clearance Production 0.023-0.065 mm (0.0009-0.0025 in)
Connecting Rod Bearing Clearance - Service 0.023-0.076 mm (0.0009-0.003 in)
Connecting Rod Bore Diameter - Bearing End 56.505-56.525 mm (2.224-2.225 in)
Connecting Rod Bore Out-of-Round - Bearing End - Production 0.006 mm (0.0002 in)
Connecting Rod Bore Out-of-Round - Bearing End - Service 0.006 mm (0.0002 in)
Connecting Rod Side Clearance 0.11-0.51 mm (0.00433-0.02 in)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.