Nicole

A quick search has not turned up anything useful... Has anybody here ever rebuilt an alternator? What's needed other than the bearings? What's the best places to buy the parts from?

Just trying to figure out, if it makes sense to pursue this avenue...

toofast928

I think it's easier, cheaper and more durable to convert to the Delco CS-130.
115 amps at 14.5v. $70.00 at Auto Zone, lifetime warrantee.

borland

I posted info on this a while back.

On my 90' S4, I replaced the bearings, brushes, and regulator at very reasonable cost. The new non-Bosch regulator made a big difference in voltage regulation at idle.

https://rennlist.com/forums/showthre...ght=alternator

this thread points site showing a Bosch disassembly:

https://rennlist.com/forums/showthre...ght=alternator

danglerb

Between the end of the 80's and now auto alternators have gone through maybe 4 generations of progress, if mine wasn't a new 90 amp I would be looking at something modern and 130 amp, only catch as I understand it is that newer ones want to spin faster and a V belt isn't good with a small pulley.

Nicole

Thank you, Barry! That's some interesting reading material for later this weekend...

Lizard928

it is easy as long as the unit is working before hand

Nicole

Mine works - just makes disturbing noises from the bearings.

Shark Attack

I tried this once. it didnt work out. it was messy. when you have it apart its pretty fragile. You should also put in a regulator and diodes too, if you do rebuild. its MUCH easier to just buy one...

Giovanni

I put a new regulator in an 84 alternator, it was pretty easy and worked great.

Nicole

Has anybody installed one of these and used it for a while?

http://cgi.ebay.com/ebaymotors/PORSC...spagenameZWDVW

dr bob

Nicole--

Noisy bearings mean vibration in the rotor, and it's just a matter of time before the rotor windings start to come apart. Additionally, big vibraions put a strain on the brushes and the regulator as they try to 'excite' the field in the rotor through the less-than-perfect connections available with the vibrations. Bottom line: Replace the bearings SAP, and plan on the brushes too. If you are making OK charging power now, no need to replace the regulator though.

Changing the bearings is easy, especially if you have access to an impact gun to get the pulley nut off. The temptation is to hold the sheet-metal pulley if you use hand tools, and that risks damage to the fan.

Oncce the pulley is off, yoy can split the unit and gain access to both bearings. The brushes are pretty obvious there in the back. Clean everything of course before you reassemble. Whole job takes less than an hour even if you drag your feet and clean everything to new appearances.

borland

If you saw one up close, you'd be pretty disappointed. Mimimal work insides. He's even cheap on the brushes. Notice he doesn't show the pully which islikely from a 944, which of course is the wrong size for your car.

I can walk you thru the whole process if you want to attempt doing the work yourself.

You can loan bearing pullers from places like Autozone or Kragen. They (with a electric impact wrench) can even remove and later install the pully after you reassemble it with new bearings.

Easy, and not very time consuming.

danglerb

I put a 130 amp G3 in my Mustang from Eagle about a year ago, works great, nice guy if you have questions on the phone or email.

2000 100% positive feedback isn't something that drops in your lap either.

Bill Ball

I found a source that details the parts...
http://www.wagneralt.com/visions/
Pop the Bosch OEM number 0-120-468-001 in the search window and see what comes up. This is the AL170X. Gives the bearing dimensions, etc.

Nicole's alternator is making a sporadic tiny squeal. We assume it's a bearing. The pulley and fan are rock stable - not vibrating at all.

Nicole, I do have a rebuilt AL170X here from Eagle Electric. It matches the one on my 89. Your alternator has a different fan; cast rather than stamped.

Nicole

Awesome! How did you find out that that's the number for my alternator?

Which parts other than the two bearings and two brushes would I need? Looking at the list I'm not sure which is the regulator I've been told to replace.

It's always made a bit of a singing noise from the rear bearing, so I did not pay much attention to it. I just thought I'd get around to fix it some day... Well, in the meantime it started "chirping", and makes an additional slightly rough sounding noise from the front (kind of what the noise was when the AC compressor bearing went South, just not as loud). So it's time to get this under control before the driving season starts.

Well, that or a BOSCH rebuilt alternator are the alternatives. I could buy the one from you and have a new one shipped to you. Or I could get a rebuilt Bosch. My understainding is that the rebuilt Bosch are somewhat around $250, while the same ones from Porsche would be around $450 or so...