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 MANUALSCHEVROLET1987FORWARD CONTROL 4.8 T, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)SUSPENSIONFRONT SUSPENSIONSUSPENSION - FRONT (2WD)ADJUSTMENTS & CHECKINGWHEEL BEARING ADJUSTMENT

1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40

Wheel Bearing Adjustment

1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40SECTION Wheel Bearing Adjustment

CAUTION: Never preload tapered roller bearings or damage to roller ends will result. Bearings are designed to have a slightly loose feel when properly adjusted.

Raise and support vehicle. Remove wheel cover, then spin wheel by hand to check bearings for excessive tightness, looseness, noise or roughness.
To check for tight or loose bearings, grip wheel assembly at top and bottom. Move assembly in and out while measuring hub movement. If movement is less than .0010" (.025 mm) or more than .0050" (.127 mm), adjust bearings.
NOTE: Bearings should be cleaned, inspected, replaced (if necessary) and lubricated before adjustment.
With hub dust cap and cotter pin removed, tighten spindle bearing nut to 12 ft. lbs. (16 N.m) while turning wheel forward by hand. Back off nut until it is just loose.
Hand-tighten nut until snug, then loosen slightly (no more than 1/2 of a flat) until new cotter pin can be inserted. Hub play (in and out) should be .0010-.0050" (.025-.127 mm) when properly adjusted. Install dust cap and wheel cover.

Fig 1: Exploded View of Front Suspension Assembly G series front susp shown; C series similar (exc front susp struts). Courtesy of General Motors Corp.

RENDER: 1.0x

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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.