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.
2001 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE
Fastener Tightening Specifications
Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Accelerator Pedal Position (APP) Module Bolts | 1 N.m | 9 lb in |
| Air Cleaner Assembly Mounting Bolts | 25 N.m | 18 lb ft |
| Air Cleaner Elbow Clamp | 5 N.m | 44 lb in |
| Air Filter Screws | 2.8 N.m | 24 lb in |
| Boost (BARO) Sensor Mounting Bolts | 3.5 N.m | 31 lb in |
| Crankshaft Position Sensor Mounting Bolt | 25 N.m | 18 lb ft |
| Driven Gear to Injection Pump Bolts | 25 N.m | 18 lb ft |
| Engine Control Temperature (ECT) Sensor | 25 N.m | 18 lb ft |
| Engine Shutdown Solenoid Fastener | 25 N.m | 18 lb ft |
| Frame Mounted Bracket Nuts | 33 N.m | 24 lb ft |
| Fuel Feed Pipe and Suction Pipe to Fuel Pump | 30 N.m | 22 lb ft |
| Fuel Injection Line Nuts | 25 N.m | 18 lb ft |
| Fuel Manager/Filter to Intake Manifold Bolts | 25 N.m | 18 lb ft |
| Fuel Solenoid Screws | 2.75 N.m | 24 lb ft |
| Fuel Tank Filter Neck Clamp | 2.5 N.m | 25 lb in |
| Fuel Tank Off-Road Shield Bolts | 35 N.m | 26 lb ft |
| Fuel Tank Strap Bolts | 45 N.m | 33 lb ft |
| Glow Plug | 17 N.m | 13 lb ft |
| Glow Plug Heat Shield | 23 N.m | 17 lb ft |
| Glow Plug Relay Battery Feed Nut | 4.5 N.m | 40 lb in |
| Glow Plug Relay Mounting Bolt | 22 N.m | 16 lb ft |
| Glow Plug Relay Mounting Nut (Federal) | 42 N.m | 31 lb ft |
| Glow Plug Wiring Harness Nuts | 5 N.m | 44 lb in |
| Injection Pump Flange Nuts | 40 N.m | 30 lb ft |
| Injection Nozzle | 70 N.m | 52 lb ft |
| Intake Air Temperature (IAT) Sensor | 25 N.m | 18 lb ft |
| Upper Intake Manifold Cover Bolts | 11 N.m | 97 lb in |
| Water in Fuel Sensor Mounting Screws | 2 N.m | 18 lb in |
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.
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