Grinding from back wheel

[magictricky]

Wheel seems to be grinding. More noticeable at slow crawling speed. Often quite when i dip the clutch and coast.
Any ideas please?

[NicBeeee]

Wheel seems to be grinding. More noticeable at slow crawling speed. Often quite when i dip the clutch and coast.
Any ideas please?

Which wheel do you think it is

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[magictricky]

I believe its the rear offside. passenger on my leftie

[NicBeeee]

Could be several things, I always check the easiest first.

Could be

Bush in rear hanger delaminating if the noise is intermitant

Brake shoes are worn

Handbrake cable not clamped

Wheel bearing shot

Check your wheel nuts

Could even just be a stone

Best thing to do is get as much detail on here as possible, is it a constant grind no matter if you are turning left or right, does it change pitch if you drive faster.



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[magictricky]

Thanks ever so much for your help and expertise.
All being well i'll get it jacked up either tomorrow or even saturday.
Regards

[magictricky]

Intermittent grind that changes pitch and gets faster as i drive faster. Sounds painful when driving slower. Come to think of it i recall it easing off a bit as i turned to the left but i'll have to confirm that.

[Ian Hulley]

I had this years ago ... it was a rear wheel bearing that required tightening up (and later replacing). It only did it when turning one way ... left if I remember correctly.

Ian

[937carrera]

I had this on my WBX last year just after buying it.

The first problem was that one of the shoe retaining pins had broken, allowing part of the spring to get wedged between a shoe and the drum

After solving that the problem was still there but less severe. I traced the issue to being the inside edge of the drum rubbing on the backplate, exacerbated by play in the rear wheel bearings.

My drums were beyond wear limit so they were replaced. This made the issue worse as they were deeper than the ones I removed, due to not being corroded / eroded.

I put new wheel bearings in to remove the play and cleaned up the backplates to minimise contact.

The rhythmic (wheel speed) grinding was gone and MPG improved on the next journey.

Check the play in your rear wheel bearings (a little is normal) and remove any rust from the edge of the drum and the corresponding groove in the backplate.

[magictricky]

Thank you all for your help and expertise.
Hopefully this will turn out to a nice easy little job i can tackle over the next few days.
I'll keep you posted!

[DoubleOSeven]

I’m going bet a £1 on a ceased brake caliper

[Ian Hulley]

I’m going bet a £1 on a ceased brake caliper

I also had a scraping noise AND unplanned braking when a shoe delaminated and the lining wandered around in the drum. The noise on a specific corner bit tells me it's the drum/hub allowed to move in and out and scrape on the backing plate.

Ian

[magictricky]

Had the time and a nice day to get this lot looked at.
After wrestling with the wheel nuts and getting the drum off i found about 6mm of play when moving the hub back and forth. I took the split pin out and gave the nut a 1/4 inch slight move to take up the slack and popped the pin back in. This will hopefully stop it wobbling and then grinding.
Gave it all a mini clean up by sanding inside and wire brushed the rust of the outside of the drum, brushed out the inside and lubricated the springs.
Not an expert but figured as it was all open.
Done the same to the other side (no play in that though)
Had the fronts off to have a nose and check the wheel nuts. Ran out of time as i had to nip out but will road test it tomorrow.
Hopefully the bearing isn't shot and all i've done is bought more time.

[magictricky]

Again thank you all for your help.
Fingers crossed i'ts ok on the road test

[CJH]

...i found about 6mm of play when moving the hub back and forth. I took the split pin out and gave the nut a 1/4 inch slight move to take up the slack and popped the pin back in.

That much play in the hub nut isn't a good thing. Those hub nuts are supposed to be done up to an extremely high torque - I can't remember the value, but imagine putting all your weight on the end of a 6ft scaffold pole.

I had the same thing - I'd tighten it up but it would loosen again within a year. I couldn't figure it out, as the split pin prevents it from turning, but one time when I was tightening it up again it slipped a thread. I realised the threads in the hub nut were quite worn, and I now think that the sideways force (e.g. during cornering) was probably causing the hub nut to jump a thread. I replaced the hub nut and it's been fine since.

[Ian Hulley]

Those hub nuts are supposed to be done up to an extremely high torque - I can't remember the value, but imagine putting all your weight on the end of a 6ft scaffold pole.

2 fat blokes on a 6ft pole and that's Official

Ian