Rebuilding Alternator

Al2O3 · Jul 9, 2017

I've been searching on LZ and there's a few threads on. Main issue seems to be getting the correct replacement bearings.
My alternator is the standard 65A one.

Anyone done it more recently than the threads that can be found on LZ?
Replacements start from £60. Is replacing the bearings (and bushes) worth the hassle?

Rougharse Racing · Jul 9, 2017

The bearing numbers should be marked on the seals or side of the bearings and you should be able to pick them up for peanuts on fleabay. Failing that measure them and go on a site such as https://simplybearings.co.uk/
Swapping the bearings is relatively easy, but you will have to de-solder three or four thick wires at the rear.

Al2O3 · Jul 9, 2017

Rougharse Racing said:
The bearing numbers should be marked on the seals or side of the bearings and you should be able to pick them up for peanuts on fleabay. Failing that measure them and go on a site such as https://simplybearings.co.uk/
Swapping the bearings is relatively easy, but you will have to de-solder three or four thick wires at the rear.

Do the bushes etc not just come off with then end of the alternator? Are there wires from the stator to desolder?

Rougharse Racing · Jul 9, 2017

The de-soldering is when the bearings need changing. The last one I did was a 300tdi Discovery and the stator windings needed de-soldering to split the main housing. Dead easy if you have a small blow torch.

Kwakerman · Jul 9, 2017

You can always get a complete rebuild kit like this or this depending if you have post or spade connectors on the back. I used one on my spare alternator without any issues. This guy does a couple of vids on how to rebuild A127 alternators.

Al2O3 · Jul 9, 2017

Kwakerman said:
You can always get a complete rebuild kit like this or this depending if you have post or spade connectors on the back. I used one on my spare alternator without any issues. This guy does a couple of vids on how to rebuild A127 alternators.

I much prefer to repair things. That's a good video. I'd looked on youtube, but didn't find that one. Mine hasn't got the three terminals (posts) together, so I guess mine's the other one. I'll have a look at the parts on their website. Interesting that he didn't change the bearings while he was in there!

guineafowl21 · Jul 10, 2017

Al2O3 said:
Is replacing the bearings (and bushes) worth the hassle?

Yes - I've done several using kits and parts from Gold Lion Autoelectrics on eBay. This is the same chap as in the Westronicsirl vids.

You just need basic tools, and a standard 40W soldering iron will do just fine.

1. While you have the rectifier off it's worth checking the six diodes with a DMM diode test function.
2. If you happen to have a variable power supply, you can also feed a rising voltage into the regulator, and check it cuts power to the brushes at around 14.5V.
3. Check for shorts between rotor/stator coils and case.

Rebuilding Alternator

Al2O3

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Rougharse Racing

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Al2O3

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Rougharse Racing

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Kwakerman

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Al2O3

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guineafowl21

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