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 MANUALSCHEVROLET1989R 20 P/U 2WD V8-454 7.4LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSCOMPRESSOR HVACSYSTEM SPECIFICATIONSTIGHTENING SPECIFICATIONSWITH R-4 COMPRESSOR
1989 Chevrolet R 20 P/U 2WD V8-454 7.4L
With R-4 Compressor
1989 Chevrolet R 20 P/U 2WD V8-454 7.4LSECTION With R-4 Compressor
Shaft Nut 14 N.m (10 ft. lbs.)
Pressure Switch 10 N.m (88 in. lbs.)
Front Head Bolts 27 N.m (20 ft. lbs.)
Pressure Relief Valve 17 N.m (13 ft. lbs.)
Rim Mounting Screws 11 N.m (100 in. lbs.)
Oil Drain Screw 17 N.m (13 ft. lbs.)
Pressure Switch 10 N.m (88 in. lbs.)
Front Head Bolts 27 N.m (20 ft. lbs.)
Pressure Relief Valve 17 N.m (13 ft. lbs.)
Rim Mounting Screws 11 N.m (100 in. lbs.)
Oil Drain Screw 17 N.m (13 ft. lbs.)
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.