05-06-2010, 03:48 PM
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how to change your front wheel bearing
The front wheel bearings on a cobalt are like most modern front drive cars, that is, they are an assembly and must be replaced as such.
It's not hard to do, and can be done with hand tools, although an impact gun does make life a little easier.
what you'll need:
The correct bearing for your car. that may seem obvious, but i had a hard time getting one, kept getting four lug hubs.
15mm shallow wall socket
6" socket extension
3" socket extension
30mm deep wall socket
6" bearing puller. you may need this, sometimes they just slide out. i wasn't so lucky.
2 jack stands
STEP one: to determine which bearing is bad, a quick test is to jack up both front wheels, spin the wheel hard by hand, then grab the spring, if you can feel it vibrating roughly, it's a bad bearing. you can usually hear it grinding as well.
STEP TWO: remove the break caliper and rotor. both bolts needed to be removed are 15mm.
STEP THREE: there is a large nut in the centre of the hub, it's a 30mm and you'll likely need a deep wall socket to get there. Use a box wrench as a holder to keep the wheel from spinning as you remove the nut. an impact wrench makes this a lot easier, because you won't need to hold the hub in place.
STEP FOUR: on the back side of the knuckle, you can see three 15mm bolts. remove them.
STEP FIVE: un plug the wheel speed sensor.
STEP SIX: if the hub just slides out in your hand, consider yourself lucky. more often than not, if the bearing failed, it's somewhat stuck on the spline of the axle.
STEP SEVEN: using a six inch three arm bearing puller, the hub should come free. also, you will again have to use a box wrench on the lug studs to keep the hub from rotating.
STEP EIGHT: apply a light coat of axle grease to the spline of the axle, and to the inside of the knuckle.
STEP NINE: be sure to apply thread locker to all the bolts before reassembly.
STEP TEN: reassemble, first slide the new bearing in, making sure that wheel speed sensor is routed correctly. tighten the three hub bolts, then the centre nut. install your brakes and wheel.
Mods: some different headlights... uhhh... and a shorty antenna... i should be keeping up with SS/SCs now.
Kills: 90 camry with a compression problem on #5, 2006 Peterbilt (no trailer even), 2007 Shelby Mustang