Question about 1994 Cadillac DeVille

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Replace alternator bearings - 1994 Cadillac DeVille

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I take it your alternator is making a squealing noise right? Not knowing your level of skills now a days it's either simpler to get another one or take it to a shop that rebuilds them. Reason is that it takes some tools that most people don't have. First taking the thing apart can be a bit of a pain because of the tolerances between the stator/rotor and the outer housing, also there can be instances of wires crossing between the two outer halfs that can get damaged.

If you decide to do this your self then first clean the entire thing on the outside to remove an dirt, oil and other stuff. Using a sharpie (perm marker) make a few marks across the two halfs of the housing so that when you reassemble it you can use these to line them up.

Remove the nut holding the pulley on then using a "Pulley puller" remove the front pulley/fan assembly (there may or may not be a small square key that aligns the pulley to the shaft).

Remove the 3 to 5 long bolts that are on the front or back that go all the way thru the housing. Important! IF your alt uses brushes then be careful on the next step taking not on how it comes apart!

Using a flat screw driver on the center "crack" dividing the two halfs slowly pry then apart. Make sure you do this little by little working your way around the the outside until it comes apart.

Now remove the stator/rotor compleatly and now you have access to the bearings. using as press, remove the bearings and then clean them noting any #'s on them (this will be needed to get the correct bearing to put back in. Clean the entire inside of the housings with some break cleaner and a toothbrush (or acid brushes) don't use any metal type of brushes (you don't want to damage any winding's or wires). Do the same with rotor.

If your ALT is the type that uses brushes on the rotor (the piece that spins inside the housing) you'll see on one end a round piece about 1/2 - 1" that has a lot of copper contacts on it. Take a piece of very fine sand paper and clean all of them (clean them just enough to make the copper shiny but not enough to remove any real amount of copper). WARNING: make sure while doing this you don't get to close to the main part of the rotor because there is wires attached to the contacts and you don't want to hit those!

Once you have the correct bearings using a press and a small piece of wood as a backer plate press the new bearings into the two halfs of the housings.

Now comes the fun part! Putting the thing back together!

Assembly is in the reverse order to took it apart in. Make sure you take care when you put the housing half with the brushes that you align them correctly (you can find little tricks on how to do it on the web, just search it)

After reading all this (and I hope you did before you started taking it apart) you'll see why you should either take it to someone that rebuilds them or buy a replacement ALT.

Hope this helps!
Mike K.

Posted on May 10, 2014

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If the bearings are bad then the brushes and other parts will be worn as well. It is better to replace the entire alternator. Unless you have the knowledge to rebuild it. The parts are as much as a re-manufacterd alternator if you replace the regulator and diod trio along with the heat sinks.

Posted on May 10, 2014

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