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Merry Christmas and a teeny problem

  • Thread starter Thread starter Tamara
  • Start date Start date
T

Tamara

Guest
I have an 85 450L with the rear drum brake. I get a rhythmic scraping sound from the rear end and can't figure out the cause. We taken the tire off, inspected the drum brake, the rear axle, chain sprocket and everything looks good. We reassembled the rear end and the rhythmic scraping sound is still there but much reduced. Anyone have any ideas where I should look next?
 
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I'm curious what you find out Tamara. I still have to do my rear drum brakes too.


Ed
 
Wheel bearings just a tad worn and allowing the rim to toddle a bit? They are grease well at the pivots and they are fully returning to the neutral position? Those would be my two first things to check.
 
Internals

Internals

chuck hahn said:
Wheel bearings just a tad worn and allowing the rim to toddle a bit? They are grease well at the pivots and they are fully returning to the neutral position? Those would be my two first things to check.
Click to expand...

Good call Chuck.

So it's not the shoes scraping...it's quite possibly the bearings.


Ed
 
The brake HUB is seperate from the rim and is held still by the stabalizer bar. The rim rolls around the pads, and if the bearings are going the rim can spin out of round, so to speak, and every now and then the pads will touch off. Same theory if the hole in the hub or the axle itself has some extra play.
 
You can try centralizing the shoes and back plate,loosen rear wheel roll if forward and backwards applying the brake to wriggle everything into position then holding brake on after the last roll and apply tighten up the axle.Otherwise could be an out of round drum ,knackered bearing/s ,stuffed chain catching the chainguard
 
Have you checked your chain isn't rubbing the chain guard and the wheel is properly aligned? Sometimes the swing arm marks are not very accurate.
 
Thanks for the ideas Chuck! We'll check those this weekend.

Tatu, the chain is not rubbing on the guard. Checked that this morning. The tire is properly aligned. We were pretty careful about getting the tire just right when we remounted it after checking the brakes.
 
Take you pinky and put it in the bearing hole and see if you feel any kind of looseness of the inner and outer races. Up and down and side to side. The bearing should also roll without any feeling of notchyness...like a roller or a race has worn in flat spots anywhere.
 
are the bearings dry? repack with grease and see if the noise disappears. if it does, replace the bearings anyway
 
Sprockets out of round or chain stretched in one place causing a tight/loose situation which wear's the cush drive and causes weird noises and worn bearings.

Thoughts ?
 
I'm in agreement with a bearing issue. I think you should have the wheel off and see if you can determine any play in it. It should be easy enough to feel and you might get a better sense of it if you put the axle through the wheel and "wiggle" it with your hands. If you support the ends of the axles on jack stands and rotate the wheel you might be able to duplicate that noise.

Good luck and let us know what you find.
 
chuck hahn said:
Take you pinky and put it in the bearing hole and see if you feel any kind of looseness of the inner and outer races. Up and down and side to side. The bearing should also roll without any feeling of notchyness...like a roller or a race has worn in flat spots anywhere.
Click to expand...

Thanks for the tip :).
 
spyug said:
I'm in agreement with a bearing issue. I think you should have the wheel off and see if you can determine any play in it. It should be easy enough to feel and you might get a better sense of it if you put the axle through the wheel and "wiggle" it with your hands. If you support the ends of the axles on jack stands and rotate the wheel you might be able to duplicate that noise.

Good luck and let us know what you find.
Click to expand...

That's a good idea. I know what we'll be doing Saturday.
 
We took the rear end apart. Bearing spin pretty smooth but they have brand new grease. The chain and sprocket were thoroughly cleaned along with the drum brake being inspected. I was only able to go for a very short drive (rain was coming in) but it seems the sound is gone. If the weather cooperates tomorrow, I'll go out for a longer ride and see if we've licked the problem.
 
I have found that shoes can swell up with moisture and that the feathered edge of the shoe can rub before the rest of the shoe contacts the hub.

Results in the rhythmic contact which you can fell up your right foot.

You could just drive a bit doing a bit of hard breaking in a controlled space.

I had a bike once that also had a problem with the linkage.

24 may have a curve in it that will cause the breaks to partly lightly engage with swing arm movement.
29 can become grooved exacerbation the problems.

Ill bet 20 bucks its not the wheel bearings.
44.gif
 
chuck hahn said:
Take you pinky and put it in the bearing hole and see if you feel any kind of looseness of the inner and outer races. Up and down and side to side. The bearing should also roll without any feeling of notchyness...like a roller or a race has worn in flat spots anywhere.
Click to expand...
The best advice!
 
I actually have a new #24 on the way. When we took everything apart yesterday, the threads on the end of it are in pretty rough shape. I may order a new 29 even though visually it looks fine.


JEEPRUSTY said:
I have found that shoes can swell up with moisture and that the feathered edge of the shoe can rub before the rest of the shoe contacts the hub.

Results in the rhythmic contact which you can fell up your right foot.

You could just drive a bit doing a bit of hard breaking in a controlled space.

I had a bike once that also had a problem with the linkage.

24 may have a curve in it that will cause the breaks to partly lightly engage with swing arm movement.
29 can become grooved exacerbation the problems.

Ill bet 20 bucks its not the wheel bearings.
44.gif
Click to expand...
 
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