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Old 17-06-2019   #1
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Alternator rebuild spares

It's a long shot but the alternator fitted to a 900e is obviously quite a rare item. It seems that it also fits the 238 van and maybe some earlier saloons. But I can't find a source for things such as the brushes or slip-rings and i'm hoping someone else has a suggested source.
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Old 18-06-2019   #2
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Re: Alternator rebuild spares

The main internals are likely to be standard stuff used on most cars of the period. Only the casings which give the mounting lugs might be unique to particular applications.

First you need to identify the manufacturer, likely to be Magnetti Marelli. With that Google may well find all sorts of bits for it. If you can identify the 'family' of internals, there may be alternators about that coould donate their internal organs.

Some manufacturers include detailed dimesion drawings in their catalogues. A modern alternator may well fit with little or no modification to the mountings.

Also, do a search for auto electrical specialists, sadly less common than they used to be.
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Old 18-06-2019   #3
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Re: Alternator rebuild spares

These are the spec's from the Haynes Manual (if they help).

Alternator (Typical)
Make: Marelli
Type: A124-14v-44A
Nominal Voltage: 12
Maximum Output: 770 watts
Maximum current: 53 amps
Cut-in speed at 12v (20 degrees C): 1000 rpm +/- 50 rpm
Battery current flow at 7000 rpm with 14v: 43 amps
Field winding resistance: 4.3 +/- 2 ohms
Direction of rotation: Anti-clockwise
Drive ration, engine to alternator: 1 to 2

Voltage regulator
Make: Marelli
Type: Re 2/12D

I measured the (double) pulley and the approximate sizes are as follows:

Small (outer) pulley diameter: 75 mm (approx.)
Large (inner) pulley diameter: 100 mm (approx.)
Spindle diameter: 10 mm (approx.)
Lock nut: 19 mm

When my alternator died in 2006 I didn't know my way around Ebay and really struggled to get parts. I had the old alternator serviced/repaired but it only lasted a few weeks.

I tracked down an outfit called Hilmart (not sure if they are still around) and they matched up a replacement/alternative. I need to check but think it's 65amps - very useful now I have an electric fan etc.

However, there were two problems, the spindle size was bigger (so I now have a different size double pulley - not such a problem). More importantly, the mounting was too thick and I had to have this machined to fit - cost more than the alternator.
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Old 18-06-2019   #4
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Re: Alternator rebuild spares

Quote Originally Posted by portland_bill View Post
The main internals are likely to be standard stuff used on most cars of the period. Only the casings which give the mounting lugs might be unique to particular applications.

First you need to identify the manufacturer, likely to be Magnetti Marelli. With that Google may well find all sorts of bits for it. If you can identify the 'family' of internals, there may be alternators about that coould donate their internal organs.

Some manufacturers include detailed dimesion drawings in their catalogues. A modern alternator may well fit with little or no modification to the mountings.

Also, do a search for auto electrical specialists, sadly less common than they used to be.
Thanks for that. It seems to be quite a rare beast and its only other road-vehicle application would be the 238 van.

I have a similar-loking alternator Marelli A-125 but not a single part of it, other than perhaps the stator-windings would be interchangeable.

I lke to rebuild things like this myself because I then know exactly what condition it's in. I'm sure the bits will turn up eventually. the alternator isn't necessarily faulty in the electric, but it may as well be refurbished at this stage.
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Old 18-06-2019   #5
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Re: Alternator rebuild spares

Thanks Gary. I've been chasing it down with those same details but it's obviously quite a rarity. I'l look on eBay Italy.
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Old 18-06-2019   #6
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Re: Alternator rebuild spares

Just stuck the A124... string into Ebay and found this.

https://www.ebay.co.uk/itm/ALTERNATO...-/361312959302

Sadly couldn't see any identification of it, to assist in finding one closer. Looks horrendously expensive, and of course lots more to ship, but shows something is available.
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Old 18-06-2019   #7
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Re: Alternator rebuild spares

Quote Originally Posted by portland_bill View Post
Just stuck the A124... string into Ebay and found this.

https://www.ebay.co.uk/itm/ALTERNATO...-/361312959302

Sadly couldn't see any identification of it, to assist in finding one closer. Looks horrendously expensive, and of course lots more to ship, but shows something is available.

Thanks for following that up. The eBay one looks similar to the later AA125 I found in my spares stash. The 900e needs one with an extra long shaft because of the double-pulley.

I've been chasing around the Internet and using a bit of cross-checking of numbers I've put faith in a company called Unistart for The bearings, brush-box and slip-ring. The total parts cost was only slightly greater than the postage!

I'm not too stressed about the rectifier as I'm pretty confident that it's OK and even eBay should turn one of those up. The external control-box looks good but I've tracked several down on eBay ranging from 20 to 100 for the same item.

I will get together all the relevant part numbers just in case anyone else wanders down this same route.

The starter-motor is in really good condition apart from half-worn brushes. I have a brand-new repair set for the Fiat 500 starter and the brushes, springs and bushes look identical.
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Old 21-06-2019   #8
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Re: Alternator rebuild spares

I received my parts very quickly from a brilliant company called "Unistart":
https://www.unistart.co.uk/
My determined scouring of the Interent and cross-checking part-numbers paid off. The slip-ring needed careful measuring and a leap of faith in ordering because I couldn't find a reference number anywhere; but it turned out to be the right size and type. I've seen the brush-box at crazy prices on foreign eBay, but the bearings are easily obtained from many suppliers, but they must carry the C3 rating.
So the total cost of the brush-box, slip-rings and bearing was less than 15; I'm thinking of going into business repairing them considering the price new or exchange.

I can't upload any images just now but will follow this up.

Unistart part numbers:

Brush-box: BHD4130
Slip-ring: SLR3913
Bearings: 6201ZZ and 6302ZZ
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Last edited by fiat500; 21-06-2019 at 20:21.
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Old 22-06-2019   #9
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Re: Alternator rebuild spares

Quote Originally Posted by fiat500 View Post
I received my parts very quickly from a brilliant company called "Unistart":
https://www.unistart.co.uk/

Unistart part numbers:

Brush-box: BHD4130
Slip-ring: SLR3913
Bearings: 6201ZZ and 6302ZZ
Very useful for future reference - thanks
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