BMW K bikes (Bricks)

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1Back to top Go down    PARTS NEEDED FOR REPAIR OF FD LEAK? on Wed Oct 11, 2017 1:05 pm

tagaz

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Bike is '85 K100RT

Oil leaked from fd onto wheel/tire/pavement.
Spoke to previous owner & learned not all seals replaced when apart for spline lube.

My question: what parts should I order to fix leaking fd?
I want to have the necessary parts before dis-assembly.



Thanks in advance for any and all replies.

Troy

    

2Back to top Go down    Anyone? on Thu Oct 12, 2017 10:22 am

tagaz

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Anyone?

Am I asking the wrong question?
Am I asking in the question incorrectly?
Am I asking in the wrong forum category?

TIA,

Troy

    

3Back to top Go down    Re: PARTS NEEDED FOR REPAIR OF FD LEAK? on Thu Oct 12, 2017 10:35 am

RicK G

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First you need to determine where the leak actually is. Front seal usually will leak from the joint between the drive and swingarm. The big seal which is covered by the wheel will leak onto the disc and will be easy to determine if the wheel is removed. Third the oil can escape from the breather which is right on top of the housing rearward of the caliper.
The rear seal would be the most likely but to start with check the oil level which should be level with the bottom of the thread of the filler hole.
Get your VIN and go to Real OEM.com and put the last 7 digits into the serial number box, click search and it will tell you the year/month and from that the correct drawings come up with part numbers and seal sizes etc.

http://www.realoem.com/bmw/enUS/select


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down    Re: PARTS NEEDED FOR REPAIR OF FD LEAK? on Thu Oct 12, 2017 7:19 pm

indian036

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I had a similar issue with my '85 K100RT.

In my case it was the seal where the final drive output comes through the housing, item 1 in the diagram athttp://www.realoem.com/bmw/enUS/showparts?id=0504-EUR-06-1985-K589-BMW-K_100_RT_84_0504,0505,0514_&diagId=33_1565 As Rick says, that is the most likely culprit for you, too.

Since I was going to dismantle the drive, I also ordered and installed the equivalent smaller seal on the input shaft and the large O ring that seals the two halves of the housing at the join. I would recommend you do the same. Drain and filler cap sealing washers as well.

Clean and carefully inspect the surfaces that rotate inside the seal. Hopefully, there will be no issue, unlike a tractor mounted post hole digger that I am renovating for my son. In operation, it is identical to the K100 final drive. Badly pitted surfaces have given me some interesting work, but it is much less of an issue if there are small leaks happening in that case.

Ideally, you would check the backlash with the gear meshing, and adjust the shims (as in add, subtract or exchange) on the input and output shafts. This also assumes you have spare shims of different thicknesses on hand for the purpose. In practice, unless there are noises or other indications, most of us normal people just take care to not lose them and replace them as they were.

Bill


__________________________________________________
1985 K100RT VIN 0028991 My original Very Happy (Historic rego)
1985 K100RT VIN 0029036 BOB the Blue Old Bike (Historic rego)
1990 K100LT VIN 0190452 Work in progress
1984 K100RT VIN 0023022 Work needing lots of progress

1986 K100RT VIN 0090542 Work needing lots and lots of progress
1993 K1100LT VIN 0183046 Work in progress
1993 K75S VIN 0213045 Newest toy, slightly non-original
    

5Back to top Go down    Thank you for the replies on Mon Oct 30, 2017 12:30 pm

tagaz

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Many thanks for the replies.
Very much appreciate you taking the time to help this newbie to brick bikes.

Regards,

Troy

    

6Back to top Go down    Re: PARTS NEEDED FOR REPAIR OF FD LEAK? on Mon Oct 30, 2017 12:44 pm

92KK 84WW Olaf

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August 2016: 68k miles Mine leaked at the vent of all places, due to the oil running extremely hot. Changed the oil even though it was fresh and the problem resolved. Never found out the cause.

February 2017: 78k miles Did a major job, clutch rear main seal etc. Also new seal to the final drive.

April 2017: 80k miles Felt all was not right and ran a check on the final drive again. Got second opinion, it was barely perceptible...big bearing replaced and problem solved. Also this was the cause of the problem previous August.

89k miles now and all is well.

If you suspect something don't leave it or you will lose the bevel drive as well.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

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