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Technical Dynamo Bearings Type

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Technical Dynamo Bearings Type

fiat500

fiat500

Patinated Peter
Parked in the garage Written a guide
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In my final push to get the car on the road I rather skimped on the dynamo. the fact that it works so hard on the 500 has troubled me since I re-used the bearings. I now hear I slight squeak under the general engine clatter and I had better replace them sharpish.

Before I go importing them from Germany does anyone know if they are a standard bearing type and if so, what are they?

Many thanks.
Peter
 
Peter
if you have a set of calipers its easy to source from Ebay UK suppliers
Outside diameter
Inside diameter
Thickness
seal type

Simply punch it in to ebay and up they come
 
From the dimensions it looks like the rear one is a 6301/2RS and the front a 2201/2RS. Don't quote me on that and it may be the wrong way round and what is front anyway?

More to follow I'm sure.

One thing for certain, I can buy these locally and save postage.
 
Hi Peter

Also check to see if your existing bearings have C3 on them too, as I've found they normally fit these for applications like Distributors. I have no idea for Dynamos,but I'd assume the same. If yes, replace with c3 version.

cheers, Steve
 
Thanks both for the advice on measuring and C3 spec. I have yet to remove the dynamo because it's safe enough to use the car locally and I want to have the spares before I start.
Conflicting info when I see helpful measurements on FD Ricambi website and can sort of read the wording on the bearings on Axel Gerstl. I think that by "rear" they mean fan end, and that it is almost certainly a 6301. The pulley or front end reads possibly as a 6201.
Looks like a dismantling job is in order.
 
There's a lot more to this than meets the eye...getting teh dynamo off in -situ for a start.
The end bearing near the fan is well encased in rivetted shields, which I haven't seen discussed before; anyone else done this job please???
Just off for some bearings.
 
(I could no longer edit so started again)

There's a lot more to this than meets the eye...getting the dynamo off in-situ for a start, but that's another story.
The end bearing near the fan is well encased in rivetted shields, which I haven't seen discussed before; anyone else done this job please???
DSC_5128 by peterthompson, on Flickr
Just off for some bearings.................................................................................... Back now having got 6301 2RSR C3 for the impeller end and awaiting delivery of ????? for the pulley end.
DSC_5127 by peterthompson, on Flickr
Removing the shield involved destroying the rivets to reveal quite a complex layer of plates with a felt seal. I assume that either the correct sealed bearings weren't available in the past and the shields and felt sealed them against leakage and dirt or that you were intended to remove the dynamo and re-lubricate the bearing at intervals.
It looks like the end shield is the thing that locates the armature because otherwise I think it could move up and down inside the dynamo casing.
I fitted the new bearing, cleaned and tidied up the shields and used shallow-headed setscrews with nyloc nuts in place of the rivets
DSC_5130 by peterthompson, on Flickr
 
Hi Peter,
My understanding with the Fiat 500 engine is the front end is gearbox side , and the rear end is the pulley side.
That's my impression anyway from all the info i read from various manuals.

Im sure you will find out which end is which when you come to fit the bearings.
 
To wrap that up, the front bearing at the pulley end is a 62201-A-2RSR.
I paid a lot more than the internet at a bearings factors, but we discussed the nature of cheap bearings and I am satisfied that the dynamo will be OK for a long time now.
 
stevehg said:
Have to agree there, with things like bearings and track rod ends, buy the best you can afford. :)

It's interesting that only one is a C3 not both. Does the pulley end run cooler?

cheers, Steve
Click to expand...

I doubt it!!!
They couldn't find C3 written on it despite that one was quite legible.
The bearing does have an infinitesimal amount of play when cold and it's rated to run at 13600 RPM as opposed to the Fiat's 4,500! (guess) so fingers crossed.
It should be so much better than the dry old thing that came out I'm not losing sleep about it:)
Nice to have done a little mechancal job properly and to keep a perfectly good dynamo going which has years of life in it rather than buying a refurbished one.
 
Last edited:
An update because I have been overhauling my second dynamo. Previously I didn't show much detail of the rear bearing sealing arrangement. This is the awkward bit that needs rivets taking out and two steel covers and a felt seal each side to be removed. I haven't seen detail of it elsewhere.
MAL_2183 by Peter Thompson, on Flickr
I had some tubular nuts and thin setscrews with very shallow heads surplus in the fitting-kits for some internal door handles. I found that these are perfect as a replacement for the long, solid rivets that have to be destroyed in order to get at the bearings.
MAL_2184 by Peter Thompson, on Flickr
I will be trimming them to length and then using Loctite to make sure that they don't unwind; the image shows them still unsecured.
MAL_2188 by Peter Thompson, on Flickr
 
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