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Fiat 126 Mechanical Problem Solving / Re: Sticky drum brake puzzle ...
« Last post by andyzeetec on October 08, 2020, 02:30:49 PM »
That's great news, I know a mechanic that worked for Fiat back in the day. He said gravity bleeds the best way, (which is what I've done), but might have to pump the pedal once to get it going. The other way to get it flowing is open the bleed nipple up, then squeeze both pistons in with your fingers, then shut the bleed nipple, let the pistons come out and repeat if necessary. Also, when bleeding brakes on an older car, what you don't want to do is push the brake pedal down too far, because the seals in the master cylinder are only used to travelling a certain distance and if you push them too far they can turn inside out and then you cant bleed it at all. :o
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Fiat 126 Mechanical Problem Solving / Re: Sticky drum brake puzzle ...
« Last post by Abarth982 on October 08, 2020, 12:49:08 PM »
Well, after much disassembling, assembling, disassembling etc etc I finally got to the bottom of this ...

One of the two pistons in the wheel cylinder had seized, this wasn't readily apparent on inspection as the brakes still worked via the one good cylinder but does account for the 'stickiness'.

Anyway, I clamped the hose and put a new wheel cylinder on and bled it through for what seemed an age.  There's a lot more movement in the pedal now (maybe to be expected?) but I'm not convinced I've got all the air out.

Are there any 'tricks' to bleeding on the 126 or is it just perseverance and copious amount of new fluid?
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Fiat 126 Mechanical Problem Solving / Re: Correct battery for bis
« Last post by Njkip on October 08, 2020, 12:01:24 PM »
Just looked at the 077 batteries, the CCA varies between 380 and 440 which is much more that what's on my 063 and more than the one that's recommended.....so if a get one of those with that amperage I'm assuming it'll not cause any damage ....I guess it must be ok if Andy is running with one....
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Fiat 126 Mechanical Problem Solving / Re: Correct battery for bis
« Last post by Njkip on October 08, 2020, 10:56:05 AM »
Hi guys, thanks for the info, yeah it was load tested and it was ok....I've replaced the battery terminals and done a proper job....soldered them on.  I've made a new earth lead and fitted that...you may have a point about the starter connections as sometimes when I turn the key there's nothing, if I fiddle with the wire on the solenoid it kicks into life..... it does seem to turn over slower than I would have thought, until I attach a jump battery that is...as I've said in previous posts the car has been stood for a long time before I bought it so maybe I just need to clean the connections on the starter end....It has had an electronic ignition fitted so don't know if that's anything to do with it not fireing up...do you know if it is possible or safe to put a bigger crank AH battery on, something like a 45AH as they do one in the 063 which does fit in the battery bay.....any thoughts? As always thanks for your input (s)
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Fiat 126 Mechanical Problem Solving / Re: Correct battery for bis
« Last post by ChrisRLewis on October 08, 2020, 09:22:43 AM »
EurocarParts and CarParts4Less are stating that the 077 battery is compatible with the bis. Carparts4Less price is £64.27 with coupon with free delivery.
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Fiat 126 Mechanical Problem Solving / Re: Correct battery for bis
« Last post by andyzeetec on October 08, 2020, 07:47:35 AM »
I have a Bosch S3 077, bought one off ebay a while back. (I believe they are a special as the +/-poles are opposite ends to standard )

For info the BIS owners manual states.. Capacity  34Ah and 140A cold cranking power.

You sure the battery is good and fully charged, was it load tested, these drop testers not only check volts but apply a load to check for a faulty cell and short circuited cell. https://www.ebay.co.uk/itm/112509680843

Maybe check and clean electrical connections terminals on starter motor, worn brushes. Oilite bushes wear, check motor turns freely, but not excessive play
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Fiat 126 Mechanical Problem Solving / Correct battery for bis
« Last post by Njkip on October 07, 2020, 08:22:54 PM »
Hi all, can anyone advise me what is the correct battery for my bis, I currently have a 063 fitted ( was in when I got car) it's 30ah crank....I think it's causing some starting problems, just doesn't seem to wiz it over fast enough, so won't start until I attach a booster battery...I've had the battery tested and it fine, so I was looking at 063 but with 45ah crank, any ideas guys.....thanks...👍
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Fiat 126 Mechanical Problem Solving / Re: BIS Front shocks
« Last post by Abarth982 on October 06, 2020, 08:07:32 AM »
Thanks for info.  Mine are on the 'to do' list but a few pages away  :D
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Fiat 126 Mechanical Problem Solving / Re: BIS Front shocks
« Last post by andyzeetec on October 05, 2020, 09:38:39 PM »
Update..

For future reference incase anyone searches for BIS Shocks, these are the cheapest I managed to find front shocks for the BIS.. KYB Kayaba Front Shock Absorber part 443005, £30 the pair.
https://www.ebay.co.uk/itm/173270878855
..although the supplied rubber bushings are incorrect. No problem as these can be purchased elsewhere. I bought the bush kit from a very helpful seller on ebay, Stefania from Ricambifiat500spares. All in all still worked out cheaper than other suppliers. Note: Top bushes are different to the bottom bushes.
https://www.ebay.co.uk/itm/264653814189

So the reason I wanted to renew the shocks, one had a very slight leak and MOT was due. Once off the car, BOTH old shocks were surprisingly a lot easier to compress compared to the new ones. Fitting was straight forward once I worked out the positions of the rubbers, metal cups, washers etc, shish kebab comes to mind.
The KYB shocks have a larger diameter shaft/thread aswell. Various supplied kyb flat washers cannot be used due to the overall diameter being too large. Solution is to drill out the new bush kit or old shock washer/s to suit. So its a bit of mix and matching between the 2 bushing kits.

The front end of the car has definately firmed up, handling has also improved. pics attached front shocks and rubbers bush kit...


































Next is to source Rear shocks as the back end is a bit too bouncy, although  surprisingly the car still passes an mot. So after a bit of research the KYB part # 443006 comes up as a fit for the 126BIS which is actually incorrect. KYB's site states the mounting type as Top pin, Bottom pin which is okay for the aircooled 126 but not the 126BIS. The BIS is Top Pin, Bottom eye.
It’s only the rear shocks that are specifically different for the BIS model.
Suppliers are limited, so Ricambio looks favourite at the moment, unless of course if anyone else knows a supplier, manufacturer and part number.

https://www.ricambio.co.uk/rear-shock-absorber-fiat-126
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Fiat 126 Mechanical Problem Solving / Re: Red Wire
« Last post by michaelodonnell500 on October 05, 2020, 01:44:47 PM »
That looks like the starter solenoid wire.
You will have a wire bolted to the starter to provide cranking current. The one that is loose takes the feed from the ignition key.
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