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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGSTEERING GEAR - MANUALADJUSTMENTSWORM BEARING PRELOAD ADJUSTMENT
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40
Worm Bearing Preload Adjustment
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40SECTION Worm Bearing Preload Adjustment
- Loosen over-center preload adjuster screw. Tighten worm bearing adjuster until all end play has been removed; then loosen 1/4 turn and tighten lock nut. Turn worm shaft carefully to either stop. Do not jam into stop as damage to gear could result.
- Rotate worm shaft back from stop about 1/2 turn. Using an INCH lb. torque wrench, measure the torque required to keep worm shaft in motion about one revolution.
- Adjust rotating torque to specifications, using worm bearing adjuster. The worm bearing preload should be between 5-8 INCH Lbs. (.6-.9 N.m). Tighten lock nut, and recheck turning torque. Adjust as necessary. Proceed to Over-Center Preload adjustment procedure.
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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.