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DIAGNOSIS AND TESTING WHEEL INSPECTION Wheels must be replaced if they: • Are bent, dented or cracked • Leak air • Have damaged wheel lug holes repairs employing hammering, heating, welding or repairing leaks are not allowed. Original equipment replacement wheels are avail- able through the dealer. When obtaining replacement WARNING: FAILURE TO USE ORIGINAL EQUIP- WARNING: REPLACEMENT WITH USED WHEELS TIRE AND WHEEL RUNOUT NOTE: Runout should always be measured off the Radial run out is the difference between the high and low points on the outer edge of the tire or wheel. Lateral run out is the total side–to–side wobble of the tire or wheel. Radial run out of more than 1.5 mm (.060 inch) measured at the center line of the tread may cause Lateral run out of more than 2.0 mm (.080 inch) measured at the side of the tire as close to the tread Sometimes radial run out can be reduced by relo- cating the wheel and tire on the wheel studs (See METHOD 1 (RELOCATE WHEEL ON HUB) Check accuracy of the wheel mounting surface; adjust wheel bearings. Drive vehicle a short distance to eliminate tire flat spotting from a parked position. Verify all wheel nuts are properly torqued (Fig. 2). Use run out gauge D-128-TR to determine run out (Fig. 3). Relocate the wheel on the mounting studs, two studs over from the original position. Retighten wheel nuts until all are properly torqued. This will prevent brake distortion. Check radial run out. If still excessive, mark tire sidewall, wheel, and stud at point of maximum run METHOD 2 (RELOCATE TIRE ON WHEEL) Rotating tire on wheel is particularly effective when there is run out in both tire and wheel. Remove tire from wheel and remount wheel on hub in former position. Check wheel radial run out (Fig. 5). It should be no more than 0.762 mm (0.030 inch). Fig. 2 Tightening Wheel Nuts Fig. 3 Run Out Gauge JX TIRES AND WHEELS 22 - 9 |