Doing the annual service on the bike; drained out the final drive oil and removed the filler plug to let it all drain freely. Just spinning the brake disc assembly... is this noise 'normal' or is it indicative of bearing problems inside the FD? Bike is 2008 GSA with 48k miles. Serviced regularly including final drive oil changes every year.
Final drive noise - normal or bad?
- Thread starter tornadof3
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- final drive hexhead
I have to say , none of mine have made that noise
Push your brake caliper towards the disc with your hand and then try, it could be the brake pads touching the disc, hard to tell with the camera picture and sound but worth a go.
Sorry just noticed your caliper is disconnected, my apologies.
Thanks for replies gents. So I don’t remember it sounding like that in the past. Just so I can budget, if it did need new bearings/final drive rebuild, what sort of ££££ would I be looking at? I don’t think this would be a job for me but I could take the FD off and take it somewhere
Sounds like road grit rubbing against the fibre thrower ring on the seal.
As in from the outside or having worked into the internals?
Recently changed my FD oil / lubed splines etc and found the ABS cable had been rubbing against the brake disk (worn down the outer sleeve of the cable), check its not rubbing!!
what did the oil look like ? silvery ? run a magnet through it !
Oil looked clean, just a few grey dots of moly lube from greasing the shaft. No leaks and no free play… thinking I will just look around for any grit eg between brake disc and hub and clean it up. As suggested, would probably see metallic swarf in oil. Perhaps I’ll drain the oil again after 1 or 2 k just to check
If I recall doing the job on my own bike correctly, the splined hub BMW call a "flange" that the brake disk bolts to has a fibre thrower ring bonded to it that sits just inside the final drive outer casting, obviously external to the oily bits. I suspect it is there in case of seal failure to prevent leaking gear oil from saturating the brake disk/pads. On my bike it had a gritty sound when turning the rear spindle, sorted with a wash out with WD40 then a degrease of the brake disk. I can't check it again now as I traded the bike about a year ago, but it was making the same sound as yours.
Great info, will definitely try that wash-out as you suggest and sounds very much like as you describe. Thanks forum
Really hard to guess from the video...
Pukmeister's suggestion sounds like a good one based on the video
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It may be the output bearing behind the flange, these are a stand alone bearing (not in the oil bath on the 2008 GSA).
I have seen these dried out and full of rust at half this age and mileage.
Spraying the WD40 around the back of the disc mounting flange may have allowed some wd40 to get past the bearing seal (as water often does) and lubricated the bearing for a while stopping the noise.
These are a standard 2Rs type bearing but will require special tools to change it, Mikeyboy is your man.
I have seen these dried out and full of rust at half this age and mileage.
Spraying the WD40 around the back of the disc mounting flange may have allowed some wd40 to get past the bearing seal (as water often does) and lubricated the bearing for a while stopping the noise.
These are a standard 2Rs type bearing but will require special tools to change it, Mikeyboy is your man.
if the rear wheel has a bit of movement in relation to the hub... like wheel bearing slop on a normal bike (on mine if you push the back down when its on the centre stand, as the wheel hits the ground you get a donk as the slop is taken up), is this a whole bevel rebuild or a separate smaller job of a bearing in the aluminum bit ?
I think I would be really quite worried if my FD was making noises anything like you describe when pushing it down while on the centre stand [then hitting the ground]. Can't believe the 'slop' your talking about on your bike is the FD??!! Swingarm or suspension slop maybe... But you did recently mention your bike was a death trap on some Dunlop's. Maybe that's why?
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