Strange noise

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Ojak
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Hi guys,

Dont really know if i should put this under driveline or brakes, but here it goes. I have a noise sounding like bonketi-bonk-brodobom-bodonk-bonk ... well, i hope you get it wink . Started as a noise, then after a week or so the ABS lamp came on, and also i got some pumping from the abs system before the light came on.

Thought it was something to the front but then i pulled the handbrake while driving and it became louder. Had a friend listen outside and he pointed to rear right, where i had recently cleaned and luricated the handbrake linkage, and also this is where the diagnose trouble code morse signal is poiniting. So i took off the disc and had a look at the handbrake again....and cant find any problem with it angry

So, what could it possibly be!? The sound does not change with speed, seems to get louder under acceleration and when pulling the handbrake but no changes when going to neutral or 4wd or so. It fades sometimes so its much less noisy and then it comes back again all of a sudden. I have been speculating about the rear abs rotor if its broken up completely and is rumbling around inside but i find that strange. At the same time i dont understand why the abs lamp should come off from a hand brake issue? Rear wheel bearing, also strange, should be more constant sound and changing with speed i would think?

Finally (and this is why i put this in driveline forum), checking the abs rotor in the rear axle, is it difficult? I cant figure out from the workshop manual if its just to split at the bearing case, pull out the axle and then look at the rotor, or do you have to remove bearings and stuff?

If anyone had anything similar or just a good idea, please let me know!

Best regards!

Ojak
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Had another test drive today

Had another test drive today and noticed that when i reversed and pulled the handbrake there is no noise at all, then switching to drive forward with handbrake still applied the noice starts immediately. Are the two brake shoes possible to swap by mistake?

Best regards!

Ojak
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Hi again,Had a longer tour

Hi again,

Had a longer tour this weekend, did some hunting and got some offroad in the snow as a bonus. The terrain handling is nothing but superb with this little machine! I followed some forestry tractor trails to go and pull out some game and those wheel tracks are deep, but the nimble litlle Pinin can easily manouvre on the crests. Love it!

Anyway, i´m starting to suspect that my problems might be the rear wheel bearings. Took away the brake disc and had a look at the parking brake shoes and mechanism. I then realized that i could move the axle shaft assembly a bit (half a centimeter or so) sideways. I would have expected that i could pull it out and in a few millimeters, but not from side to side.

Question: Should i expect any lateral flex on the axle shaft asembly (the part that holds the wheel bolts) on the rear axle?

Best regards

Claude io
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rear bearing

I would say that you shouldn't have any free play, that much free play is, to me, dangerous. If that bearing gave up, it could block that wheel without any warning or even come out and go left while you go right. 

Happy io

Ojak
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Just curious...

Thanks Claude!

Just curious, is this what can be expected from a car thats gone 200000kms / 125000miles?

Has anyone else here had to do their rear wheel bearings and if so at what mileage?

Best regards!

Claude io
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bearing

Funny you ask this question....my io is now just a bit over the 200000 kms and I thought of replacing those bearing, just to be on the safe side as I will use it for a long trip. Now rear bearing at 200000 kms, is it expected ? I would say that it is not a strange thing to be worn at this kms. 

I do find more strange is the description of the noise, in your first post, as you said yourself, rear bearing tend to be more noisy with speed, . One sure thing, 5 mm of free play is not something to leave as it is...

Happy io

Ojak
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Have kept driving in the

Have kept driving in the meantime, havent had time to fix it, plus its winter and i dont have any garage indoors to work on this. Went out today and took of the wheel just to verify my diagnose, and hell yes - its the bearing. The whole brake disc / axle shaft assembly can be moved by hand some half cm in all directions and its leaking gear oil from within. So, plan is to buy a used complete rear axle from the scrapyard. From what i can see in the manual its a lot of special things involved in the bearing change (grinder & chisel on the beearing races, press fitting of the new part) as well as buying new shims, seals, abs rotors and so on.

Anyone done the bearing change that would be willing to comment?

Best regards

Ojak
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So, final update here. Looked

So, final update here. Looked through the chapter on changing rear bearings and decided it was too much specials tools and procedures etc for me. Got a complete rear axle from the wreckers that only had 90k kms on it. Took out the old one, put in thew one and now its fine. Trouble hit in a couple of points. The replacement axle had too short hand brake wires so i welded new fittings for it. Some of thehand brake wire holders was rusted and couldnt be reused so i welded new ones on. Finally the bushings for the rear shocks was not possible to save, so i used my lathe to do new ones in nylon instead. Now it all works fine and it passed the yearly inspection. Disturbs me a bit to see the rear bearing give up on a beam axle after this mileage but thats reality, unfortunately.

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