Metal flakes in the final drive oil
- Thread starter Comfy Old Boots
- Start date
Quite likely Big bearing fucked then!
BUTsplit it and see what is its like away from the rest of the drive...
If it moves freely then likley you have a problem up front probably the front or input bearing
Also if ordering spares? order the ABS sensor o rings and the BIG o ring that goes around the edge of the FD and get yourself a tub of red rubber grease anything rubber get a slather of grease as its rebuilt that will help prevent water / dirt / salt ingress and consequentially corrosion if you need to split it again in the future
Thank you too for the advice. I'm eager to find out what the problem is and I'll wait to see what's going on before I order any parts. I have possible solutions to the problem open to me and that is encouraging and reassuring.
Also, I rode the 850 this morning to work and the final drive is smooth and quiet. The 1150 feels very very rough. I had an inkling something was wrong when i test rode it but had the '1150's are not as smooth as 850's ' at the back of my head. Anyway, cheers.
Excuse my ignorance but is this the input shaft on the left and why can't I see a bearing listed in the parts fiches on Max bmw?
http://www.maxbmwmotorcycles.com/fiche/DiagramsMid/B0000749.png?v=04282014
try this http://www.maxbmwmotorcycles.com/fiche/DiagramsThumb/B0004374.png?v=04282014 It is under 33 Rear Axle & Suspension.
Not sure what you mean by input shaft, that would be at the front of the gear box, you are looking at the pinion.
Not sure what you mean by input shaft, that would be at the front of the gear box, you are looking at the pinion.
Ah, Packer mentioned the input shaft and I was hoping he was referring to the part I showed.
The part on the left of your pic is "basically" the input shaft of the final drive
but is really the pinion as in Crown wheel and pinion
but is really the pinion as in Crown wheel and pinion
Last edited:
The part on the left of your pic is "basically" the input shaft of the final drive
but is really the pinion as in Crown wheel and pinion
Ah good. I was keeping up 
Look here
Mark Huggett, website is www.bmwbike.com. If the above link doesn't take you to the correct page just follow the:- products; online shop; R models 4v; Serie R21 and then track down to the final drive section. Lists all the bits for the pinion assembly with BM part nos. with their prices to compare with your dealer offer or Motoworks, Moto-bins, Sherlocks etc.
Edit, linked the image. Huggett's prices are in Swiss Francs
Mark Huggett, website is www.bmwbike.com. If the above link doesn't take you to the correct page just follow the:- products; online shop; R models 4v; Serie R21 and then track down to the final drive section. Lists all the bits for the pinion assembly with BM part nos. with their prices to compare with your dealer offer or Motoworks, Moto-bins, Sherlocks etc.
Edit, linked the image. Huggett's prices are in Swiss Francs
Thanks Packer.
Ehm Owen You do not want to be buying any of those bits!
you don;t have the gear to change them in Normal DIY situation !
you don;t have the gear to change them in Normal DIY situation !
You need
1 of these TRA51182 large O ring
1 of these TRA42210 Large Bearing
1 of these TRA63482 Large Seal
2 of these BRA27220 ABS sensor O rings
and about 200cc's of GL5 specifiction Gear oil
1 of these TRA51182 large O ring
1 of these TRA42210 Large Bearing
1 of these TRA63482 Large Seal
2 of these BRA27220 ABS sensor O rings
and about 200cc's of GL5 specifiction Gear oil
This has all the potential to turn into a car crash thread.
It is more that I know Owen and he has more youthful enthusiasm than is healthy and he would give it a bloody good try to get those bits out and probably cost himself more money in the long run
He's well capable of doing the big bearing and seals etc But he hasn't the heavy duty stuff for the input bearing and the other bits
Eh hang on, I'll not be spending a penny until I know what's in there. If there's a hole in the Bevel box like the link you posted, I'll be spending my money on beer. If it's just bearings, I'll buy those then. I was just trying to confirm which bit was being mentioned, not suggesting I was going to buy the whole lot
Thanks for the subsequent vote of confidence though!
Thanks for the subsequent vote of confidence though!
Ahhhhhhhhhhhhhhh You did not say this Grass hopper.....
the bit that was working as a boring bit was part 7 in this drawing it had moved on the rear of the pinion (input shaft wotsit), I do not know how but it had moved back towards the crown wheel and was buffing it too
You will know right away If its done it as you will see a whole circle of 2 1/2 cm rather than a wee one of 1cm
I'm going to look tomorrow morning. I'm not going to have a chance to clean it with paraffin but I did put new oil in the box yesterday and rode two miles, so I'm hoping that will have flushed a lot of the crap out. I'll take some photos...
I don't have time to split the box this morning. I dropped the oil though and this is what I found:
This one too. The jagged piece was in there two. About five to ten times the amount of chunks came out on Monday. I'll split it later and look. Also, the photo does not show all the sparkly stuff in the white container.
Pah, this is when you worry ..
When your crown wheel turns from this...
To this......
When your crown wheel turns from this...
To this......
No dismantling needed - Very simple - Just pull the final drive flange seal out and you can see the bearing cage... or whats left of it in your case.
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