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 MANUALSCHEVROLET1990CHEVY VAN G20, 4.3 Z, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL4.3L V6 - VIN [Z]TORQUE SPECIFICATIONS
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40
Torque Specifications
1990 Chevrolet Chevy Van G20, 4.3 Z, 475/M40SECTION Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | ||||
|---|---|---|---|---|---|
| Bellhousing Bolts | 32 (43) | ||||
| Camshaft Sprocket Bolts | 21 (28) | ||||
| Connecting Rod Nuts | 45 (61) | ||||
| Cylinder Head Bolts | (1) 65 (88) | ||||
| Exhaust Manifold Bolts | (2) 20 (27) | ||||
| Stainless Steel Manifold Bolts | 26 (35) | ||||
| Flywheel Bolts | 75 (102) | ||||
| Intake Manifold Bolts | 35 (47) | ||||
| Main Bearing Cap Bolts | 80 (108) | ||||
| Oil Filter Adapter Bolt | 15 (20) | ||||
| Oil Pump Bolts | 65 (88) | ||||
| Vibration Damper Bolt | 70 (95) | ||||
| Water Outlet Bolts | 21 (28) | ||||
| Water Pump Bolts | 30 (41) | ||||
| Spark Plugs | 22 (30) | ||||
| INCH Lbs. (N.m) | |||||
| Camshaft Thrust Plate Screws | 105 (12) | ||||
| Front Cover Bolts | 96-113 (11) | ||||
| Lifter Retainer Bolts | 145 (16) | ||||
| Oil Pan-to-Block Bolts | 100 (11) | ||||
| Oil Pan-to-Block Nuts | 200 (23) | ||||
| Oil Pan Studs-to-Seal Retainer | 15 (2) | ||||
| Oil Pump Cover Bolts | 80 (9) | ||||
| Rear Oil Seal Retainer Nuts | 135 (15) | ||||
| Valve Cover Bolts | 90 (10) | ||||
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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.