Total Backlash Check
- Raise and support the vehicle. See LIFTING
.
- Remove the propeller; see PROPELLER SHAFT REAR (4X2) REMOVAL/INSTALLATION
or PROPELLER SHAFT REAR (4X4) REMOVAL/INSTALLATION
.
- Install Coupling Holder ST
49 S120 710
- Clamp a rigid bar or pipe to the tool. Clamp the other end of the bar or pipe to the frame or a body member in order to prevent movement of the rear companion flange
Courtesy of MAZDA MOTORS CORP.
- Lower the vehicle so that one rear wheel is resting on a wheel chock to prevent it from turning. The other rear wheel will be used to measure total rear axle backlash
- Rotate the free wheel slowly, by hand, until the feeling of driving the rear axle is encountered. Place a mark on the side of the tire, 305 mm (12 inches) from the center of the wheel, with a crayon or chalk
- While holding the crayon or chalk against the tire, rotate the wheel slowly in the opposite direction until the feeling of driving the rear axle is encountered again
- Measure the length of the crayon or chalk mark on the tire
- If the length of the mark is 25.4 mm (1 inch) or less, the rear axle backlash is within allowable limits.
- If the chalk mark is greater than 25.4 mm (1 inch), check for these conditions:
- Elongation of the differential pinion shaft and holes in the differential case
- Missing differential pinion thrust washer or differential side gear thrust washer
- Galling of the differential pinion shaft and bore
- Excessive ring gear and pinion backlash. Follow the procedure for the type of rear axle to check backlash.