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 MANUALSGMC1989MAGNAVAN 5.7 K, 3L80/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELTORQUE SPECIFICATIONS
1989 GMC Magnavan 5.7 K, 3L80/M40
Torque Specifications
1989 GMC Magnavan 5.7 K, 3L80/M40SECTION Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) |
|---|---|
| Glow Plugs | 13 (17) |
| Injection Line Fittings | 20 (25) |
| Injection Nozzles | 50 (70) |
| Injection Pump Mounting Nuts | 30 (40) |
| Injection Pump Gear Attaching Bolts | 20 (25) |
| Intake Manifold Bolts | 30 (40) |
| INCH Lbs. (N.m) | |
| Advance Pin Hole Plug | 90 (10) |
| Head Locating Screw | 17 (23) |
| Injection Pump Guide Stud | 85 (9.5) |
| Injection Pump Cover Screws | 33 (3.7) |
| Solenoid Terminal Nuts | 12 (1.2) |
| Side Cover Screws | 18 (2) |
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.