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 MANUALSGMC1991C3500 HD 6.2 J, STANDARD, NV4500/MT8REPAIR AND DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVE/INSTALL/OVERHAULTORQUE SPECIFICATIONS
1991 GMC C3500 HD 6.2 J, Standard, NV4500/MT8
Torque Specifications
1991 GMC C3500 HD 6.2 J, Standard, NV4500/MT8SECTION Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Fuel Line Nut | ||
| Except 4.3L Turbo | 20 (27) | |
| Idle Air Control Valve (Threaded) | 13 (18) | |
| Lower Intake Manifold Bolts (Turbo) | 35 (47) | |
| Oxygen Sensor | 30 (41) | |
| Throttle Body-To-Manifold Bolts | ||
| 2.5L | 12.5 (17) | |
| 2.8L & 3.1L | 18 (24) | |
| 4.3L Turbo | 18 (24) | |
| All Others | 12 (16) | |
| Turbocharger Line Fittings | ||
| Coolant Lines | 16 (22) | |
| Oil Feed Line | 13 (17) | |
| Turbocharger-To-Manifold Nuts | 33 (45) | |
| INCH Lbs. (N.m) | ||
| Fuel Line Fittings (Turbo) | 58 (6.5) | |
| Fuel Meter Body Screws | ||
| TBI Model 220 | 30 (3) | |
| TBI Model 700 | 53 (6) | |
| Fuel Meter Cover Screws | ||
| (Model 220 Only) | 28 (3) | |
| Fuel Pressure Regulator Screws | ||
| (Model 700 Only) | 22 (2.5) | |
| Idle Air Control Valve Screws (Flange Mounted) | 28 (3) | |
| Turbocharger Oil Return Line Bolt | 35 (4) | |
RENDER: 1.0x
NO RELATED
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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.