![]() Tighten the retaining screws to 13 inch lbs. Wheel bearing locknut and inner washer.Press the wheel bearing and race into the hub so that the race is fully seated in the hub bore.Press the wheel bearing and race out of the hub.Locking hub or hub drive flange, if equipped.Stake the nut into the groove in the spindle.2: When installing the new hub nut, be sure to stake it into the notch on the spindle Hub and bearing assembly from the spindleįig.Raise the staked portion of the hub retaining nut with a hammer and chisel.Rear caliper and rotor assembly from the hub, if equipped.1: Exploded view of the rear wheel hub and bearing assembly (disc brake model shown, drum is similar) If the bearings are bad, a new hub/bearing assembly must be installed. NOTE: The wheel bearings are not serviceable. Front wheel hub using the Mazda press tools.New oil seal using Installation tool 49 V001 795.Using the press tools, press a new wheel bearing into the knuckle assembly.Using Mazda Press tools 49 G033 107 and 49 H026 103, install a new dust shield cover assembly to the knuckle.Clean and inspect all parts but do not wash or clean the wheel bearing.Front wheel bearing from the knuckle, using the hub puller tools.Bearing inner race from the front wheel hub.Using Mazda Hub Puller tools 49 G033 102, 49 G033 104 and 49 G033 105, pull the front wheel hub from the knuckle assembly.Before servicing the vehicle, refer to the precautions in the beginning of this section.REMOVAL & INSTALLATION Except Miata FRONT Tight or untight if necessary, recheck after same 200km (120 miles ). After that check if it is not overheating (too tight) or there is a play (too loose). Normally a wheel bearing should be in correct position and use after about 200km (120 miles) distance. Lower the car down and take a slow drive around (do not accelerate sharply or brake rapidly, just a gentle drive around. Make sure all nuts are tight, use a tension wrench when needed, put the brake disc back on the hub, install the brake caliper, once you have all them on and tight put on the wheel, then get someone to press the brake while you tight the shaft nut with the tension wrench, check the wheel for play or hard movement. After getting the bearing fitted into the hub, all we need is to reverse the whole process, put the shaft into the hub, attached the hub to the shock absorber (makes it easier to attach the rest), put the nut and tight it just as much to feel there is nearly no movement (do not overtight it as this might damage the bearing), attach all ball joints back to the hub. Get the old bearing pressed out and the new one pressed in.The Mazda part numbers for the front bearing kit are: B455-33-047A(B,D), GJ21-33-042B, G304-33-065, B21M-33-048. You will need to go to a garage with a 12ton (minimum) press, no point of trying to hammer the bearing out as you may damage the hub and your whole work will be for nothing. To replace the bearing (do two of them in one go even if only one can be heard) you need to do as follows: Loosen the nut on the half shaft, jack up the car, remove the wheel, dismantle brake caliper and brake disc, remove all ball joints attached to the hub, detach the shock absorber from the hub (no need of removing it completely), once you have the hub basically hanging on the half shaft, untie the nut and pull the hub out of the shaft so you can hold it in your hands. In a Mazda 323 BJ (1999-2004) it usually comes every 150-200 thousand kilometers (95-120k miles). The moment you can hear a loud noise coming from front wheels while driving straight that means that your wheel bearings are ready for replacement.
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