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 H2FACTORY OEM SERVICE PROCEDURE

Fastener Tightening Specifications

Application	Specification
Application	Metric	English
Engine Shield Bolt	20 N.m	15 lb ft
Exhaust Heat Shield Bolt	9 N.m	80 lb in
Exhaust Heat Shield Nut (Body Panel)	9 N.m	80 lb in
Exhaust Manifold Bolts - 4.8L, 5.3L, and 6.0L Engines
First Pass in Sequence	15 N.m	11 lb ft
Final Pass in Sequence	25 N.m	18 lb ft
Exhaust Manifold Heat Shield Bolt - 4.8L, 5.3L, and 6.0L Engines	9 N.m	80 lb in
Exhaust Manifold Pipe Hanger Bracket Bolt	12 N.m	106 lb in
Exhaust Manifold Pipe Nut	50 N.m	37 lb ft
Exhaust Muffler Clamp Bolt	30 N.m	22 lb ft
Exhaust Muffler Hanger Nut	50 N.m	39 lb ft
Exhaust Muffler Nut	40 N.m	30 lb ft
Exhaust Pipe Clamp	44 N.m	33 lb ft
Hood Hinge Bolts	25 N.m	18 lb ft
Oxygen Sensor	42 N.m	31 lb ft
Rear Shock Absorber Lower Bolt	95 N.m	70 lb ft
Transmission Bolt	100 N.m	74 lb ft
Transmission Mount Nut	40 N.m	30 lb ft
Transmission Support Crossmember Bolt	70 N.m	52 lb ft

Factory Service Tools

Use the Manual With the Right Hardware

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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.