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Old 3 Weeks Ago   #16
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Re: 126 650cc engine transplant..

Quote Originally Posted by The Whitakers View Post
if I kept the alternator, ill look to see if there is a thread relating to the exchange.


Not sure why I have these crazy ideas and set these stupid time scales.....

Setting time scales is good for getting things done; but it can take the pleasure out of things and make them into a task.

All the information is spread about on this Forum but first consult the King of Electrics.

https://www.fiatforum.com/500-classi...ml#post3189473
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Old 3 Weeks Ago   #17
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Re: 126 650cc engine transplant..

There is not a problem about retaining the Dynamo on the 650 engine and assuming that it is working ok at the moment it would be one less thing to worry about on the engine swop. The only minor issue is the fact that it might be necessary to cut a tiny 1cm corner from the fan tinware due to a slight difference in the crankcases. I was told that the late production of the 126 in Poland included an economy model that ran a dynamo.
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Old 3 Weeks Ago   #18
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Re: 126 650cc engine transplant..

Quote Originally Posted by the hobbler View Post
Simple answer---no! The alternator and the dynamo have different mounting methods to the crankcase and the aperture in the fan housing is of a slightly different shape. It HAS been done, but the person who did it said, and I quote, "never again".
I am not an electrician, but I have been told that it is not a difficult mod. !st of all though, which type alternator is on your 'new' engine---the early 650s had a completely remote regulator, the later ones had an integral regulator. On some, the regulator is a small unit bolted to the casting (part of the alternator) that bolts to the crankcase. If you can let the Forum know which one you have, I am sure that the 'electrical brains' can let you know how to re-wire the system.

Apologies I overlooked this reply...…..I'll take some pics and post them tonight...……


Do you have to 'host' pictures or can they be just attached?
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Old 3 Weeks Ago   #19
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Re: 126 650cc engine transplant..

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Re: 126 650cc engine transplant..

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Old 3 Weeks Ago   #21
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Re: 126 650cc engine transplant..

#Update ...…


Bit of a manic tear down last night!....surprisingly enough though the amount of wear is minimal throughout. You can still see the honing in the cylinders and no lips whatsoever at the top and bottom of the piston stroke. The cam is like new and the big ends and mains are cool although I have a set of big ends so i'll change them just because why not...…


Ordered all the bits for the rebuild so the rest of the week will entail clean down and re-assemble ready for the swap at the weekend...…..


I'll take pics as an over view but wont have time to go to much into detail...…


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Old 3 Weeks Ago   #22
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Re: 126 650cc engine transplant..

I'll be watching this thread with interest as a 126 transplant is something I'd like to do when time permits. I've noticed that some of the prices being asked for used 126 engines have got a bit silly. I've seen a seized one on eBay for £450, just the engine, no gearbox!

Can anyone confirm that a 500 gearbox with 126 bellhousing will fit a 126 engine? I read somewhere that the 500 gearbox is a stronger unit than the 126, is this correct?
I'm not too fussed about synchro as I enjoy double declutching, but fitting a 126 engine and transmission is probably the best solution and will allow me to mothball the entire 500 engine and transmission.
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Old 3 Weeks Ago   #23
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Re: 126 650cc engine transplant..

Quote Originally Posted by Hobo1960 View Post
I'll be watching this thread with interest as a 126 transplant is something I'd like to do when time permits. I've noticed that some of the prices being asked for used 126 engines have got a bit silly. I've seen a seized one on eBay for £450, just the engine, no gearbox!

Can anyone confirm that a 500 gearbox with 126 bellhousing will fit a 126 engine? I read somewhere that the 500 gearbox is a stronger unit than the 126, is this correct?
I'm not too fussed about synchro as I enjoy double declutching, but fitting a 126 engine and transmission is probably the best solution and will allow me to mothball the entire 500 engine and transmission.

I believe you are correct in saying the 500 box is stronger but to be fair the amount of power you can get out of these lumps isn't going to blow a mesh box apart...….get a mesh box in there mate......and yes you have to swap the bell housings over (or so I have been told)….
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Old 3 Weeks Ago   #24
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Re: 126 650cc engine transplant..

It sounds like you have got yourself a good engine there. If it has minimal wear I would definitely not replace the big end bearings as the ones you have a most likely the factory originals, best quality and already run in
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Old 3 Weeks Ago   #25
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Quote Originally Posted by Hobo1960 View Post
I've noticed that some of the prices being asked for used 126 engines have got a bit silly. I've seen a seized one on eBay for £450, just the engine, no gearbox!
It may be an unfair comparison as I am currently in Sicily, but I just bought my 650 engine complete with trans and 28IMB carb for €400.
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Old 3 Weeks Ago   #26
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Re: 126 650cc engine transplant..

Specifically a 126A1 engine in supposedly running condition (I doubt it) from a salvage yard.
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Old 3 Weeks Ago   #27
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Re: 126 650cc engine transplant..

It is quite an easy job to fit a '126' bell-housing to a '500' gearbox. Support the gearbox so that it is standing vertically, with the bell housing at the top. Remove the boot holders on the side of the box and then the big bolts that hold the bell-housing to the gear-box body. Carefully remove the bell-housing , making a note where the bearing play adjuster rings are (in order that you dob't upset the diff adjustment). If you are in any doubt as to the condition of the drive-shaft splines, this is the time to fit new shafts and couplings. Remove the '500' bell-housing---fit the '126' bell housing and bolt in place. Naturally, clean all mating surfaces and put a light smear of 'goo' on the mating surfaces. Refit the drive-shaft boot rings and clutch operating parts as required.
Despite the fact that I have a '126' 'box in my 500, I still tend to double-d-c on most down-shifts--much more fun! Remember, unless you are VERY good with your down-shifts, only select 1st gear when the vehicle is stationary--I tend to slip into 2nd very briefly (to align the gears) prior to selecting 1st
All the best with the conversion---let us know if there is anything that you need help on---it is what this Forum is for.
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Old 3 Weeks Ago   #28
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Quote Originally Posted by Hutbed View Post
Specifically a 126A1 engine in supposedly running condition (I doubt it) from a salvage yard.
Well that’s what I have just got, why is it special? I note it has double valve springs so it must be fast lol...
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Old 3 Weeks Ago   #29
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Quote Originally Posted by the hobbler View Post
It is quite an easy job to fit a '126' bell-housing to a '500' gearbox. Support the gearbox so that it is standing vertically, with the bell housing at the top. Remove the boot holders on the side of the box and then the big bolts that hold the bell-housing to the gear-box body. Carefully remove the bell-housing , making a note where the bearing play adjuster rings are (in order that you dob't upset the diff adjustment). If you are in any doubt as to the condition of the drive-shaft splines, this is the time to fit new shafts and couplings. Remove the '500' bell-housing---fit the '126' bell housing and bolt in place. Naturally, clean all mating surfaces and put a light smear of 'goo' on the mating surfaces. Refit the drive-shaft boot rings and clutch operating parts as required.
Despite the fact that I have a '126' 'box in my 500, I still tend to double-d-c on most down-shifts--much more fun! Remember, unless you are VERY good with your down-shifts, only select 1st gear when the vehicle is stationary--I tend to slip into 2nd very briefly (to align the gears) prior to selecting 1st
All the best with the conversion---let us know if there is anything that you need help on---it is what this Forum is for.
Am I right in saying I need to use the 500 shafts on the 126 box?
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Old 3 Weeks Ago   #30
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Re: 126 650cc engine transplant..

Quote Originally Posted by The Whitakers View Post
Am I right in saying I need to use the 500 shafts on the 126 box?
Yes..and if your existing has the narrower, 19mm shafts you would be wise to replace them with new ones with an approximate 24mm diameter.
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