Club126UK
Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: Bambino126 on May 08, 2014, 05:41:19 PM
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Just started getting a weird scraping noise coming from the rear left hand side of the car.
Jacked it up and found this. :o
What's wrong, and how do I put it right?
(http://i46.photobucket.com/albums/f101/tashman_/Driveshafts003.jpg) (http://s46.photobucket.com/user/tashman_/media/Driveshafts003.jpg.html)
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The hub nut is either comming loose or the wheel bearing collapsed. My money's on the hub nut. It's happened to me once :) easy fix just undo the 4 bolts holding the flange on then move the flange/driveshaft to one side and the nut is right there
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I would disconnect the drive flange and check the condition of the drive coupling :)
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So is the "drive flange" the part with the 4 bolts going through it? And the coupling the part that's been badly scraped? Sorry I don't know the right names
Do drive couplings develop play? Why would it be scraping on the piece next to it? ???
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The flange is the bell shaped piece with the four bolts in it, the drive coupling is the cylindrical piece that's been scraping. It's difficult to explain but it's hollow and filled with rubber in which a splined bush is set in the middle which the end of the hub goes though. The idea is that drive is transmitted through the flange which turns the drive coupling which then turns the splined bush via the rubber innards which is connected to the hub. The rubber is there to cushion the power however they deteriorate over time which loosens it all up which means the out cylindrical part rubs on the suspension arm.
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Ah, I get it now. Thanks.
I'll strip down that section and see where we are with it. ;)
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Ok striped it down and decided to replaced the wheel bearings and the drive couplings on both sides of the car.
When I removed the brake drum on one side a load of clips and retainers (very mangled) fell out too which might explain some weird noises I've been getting during braking. The brake shoes were worn quite low and the drum was very badly scored on the side where the brake parts had come undone and were flying around inside. So its new drums and shoes for both sides too.
Now I'm putting it all back together with the new parts and I have 2 questions.
1) The manual says to get the tightness in the bearing correct you have to wind an old piece of string around the brake drum and then attach it to a spring balance and gradually tighten the hub nut in stages until the effort required to turn the drum is 450g on the spring balance.
Do people actually do this?? It sounds like a real piece of "Fiat engineering" :lol: I don't think I've even seen a spring balance since I was in science class at primary school. Where would you even get one?
Is there a different way people set up these bearings these days?
I've only changed car wheel bearings once before in my life and that was on an old Mercedes and you set up the endfloat to 0.01mm +-0.005mm using a DTI gauge.
2) My wheel bearing kit I've received from ricambio seems to have one more part in it than the bearings that I took off the car. It's a small oil seal (on the right in my picture). Do I need it and where does it go?
Many Thanks!!
(http://i46.photobucket.com/albums/f101/tashman_/bearings001.jpg) (http://s46.photobucket.com/user/tashman_/media/bearings001.jpg.html)
(http://i46.photobucket.com/albums/f101/tashman_/bearings003.jpg) (http://s46.photobucket.com/user/tashman_/media/bearings003.jpg.html)
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When I did my bearings I just tightened them up until the play was gone and it's been fine ever since :) also if your after a set of drums I have some brand new ones for sale - Delphi ones
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Well that's what I was thinking of doing really, tightening them until there was no real play but not so tight as to cause drag.
Any idea where the small oil seal goes or is it a superfluous part?
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Yeah it's not so much a seal but a big washer that slips onto the spline just before you screw the nut on
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Ah ok thanks.
Just put it back together, the new bearings, and new coupling, done the big nut up and guess what...
The coupling is still scraping on the suspension arm. Grrr!! >:(
Now what?
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Looking back at your original picture , assuming that the swinging arm is structurally sound (they have been known to rust through) is it possible that the rear wheel has taken a bit of a knock as the clearance on the coupling does look less on the lower side ?
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Well if it's not the bearing and the nut is done up I'ld be tempted to remove the joint and sand it down somehow with an angle grinder or emry cloth and just put it down to one of those 126 oddities
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Mine has done the same since I replaced the couplings, all together properly. Think the replacement couplings might be oversized. Other than that take it all apart and clean all the crap from the area.
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Yes it's the lower side that it's catching on. Both sides of the car are scraping when turning the stub axle by hand. The only option I can really see is to remove the hub/stub axle/coupling, and get an angle grinder in there, and take a millimeter off the swing arm to give the coupling some clearance. ::)
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I wouldn't take anything off the arm, have the coupling machined a couple of mm. You need all the steel you have on the swing arm. Did you have any difficulty in tightening up the bearing against the crushable distance piece, I found it very difficult to tighten required a long lever and two people to get it tightened.
Ralph