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.
2008 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Timing Components: Specifications
Timing Chain Tensioner Bolt 25 N.m (18 lb ft)
Timing Cover Bolt (1) 10 N.m (89 lb in)
Crankshaft Pulley (2) 150 N.m (111 lb ft)
(1) Tighten the small center bolt last to 8 N.m (71 lb in)
(2) Install the crankshaft balancer washer and a NEW bolt. Tighten the bolt a first pass to 150 N.m (111 lb ft). Using the J 45059 rotate the bolt a final pass an additional 180 degrees.
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.