Merry Christmas and a teeny problem

[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?

[GSXR7ED]

I'm curious what you find out Tamara. I still have to do my rear drum brakes too.


Ed

[chuck hahn]

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.

[chuck hahn]

Hole in the hub maybe worn out a bit and the hub shifts and lets the pads scrape???

[GSXR7ED]

Internals

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.

Good call Chuck.

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


Ed

[chuck hahn]

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.

[daturat100r]

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

[tatu]

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.

[Tamara]

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.

[chuck hahn]

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.

[Agemax]

are the bearings dry? repack with grease and see if the noise disappears. if it does, replace the bearings anyway

[Mekanix]

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 ?

[spyug]

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.

[Tamara]

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.

Thanks for the tip .

[Tamara]

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.

That's a good idea. I know what we'll be doing Saturday.