BMW K bikes (Bricks)

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1Back to top Go down   Oil leak Empty Oil leak Mon Oct 16, 2017 6:01 pm


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Seems I have a leak. Suspecting either main seal or the o ring on the output shaft. Have started my reading up on how to go about it. What I'm wondering is; what other issues are likely to crop up during the job? I'm thinking rusted bolts etc, other jobs to do whilst the gearbox is out and stuff like that. Hopefully I'll try and order parts all at the same time.
Cheers.  Oil leak 78846


2Back to top Go down   Oil leak Empty Re: Oil leak Tue Oct 17, 2017 6:28 am

92KK 84WW Olaf

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Life time member
I did that job back in February and did everything else while in there.

A few things....

New rear seal....get the BMW one, not the alternatives.
New O ring.
I put in new clutch plate, Sachs is good and they make the BMW ones so don't buy the BMW badge.
Also new clutch bolts, flywheel nut.
Did the gearbox and final drive seals too.
Also replaced driveshaft boot, clutch pushrod boot and their clips, clutch pivot arm bearings [pig to get old ones out].

If you are in that far worth taking out sprag clutch and doing a clean on it.

I knew my alternator monkey nuts were good, but easy enough to get at any time.

New exhaust nuts, studs, gaskets.

WD40 the whole darn lot for ages before hand, anything you need to be opening including the exhaust studs/nuts, . Its so worth it.

1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 45,920 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500

3Back to top Go down   Oil leak Empty Re: Oil leak Tue Oct 17, 2017 6:59 am


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While your doing it fit a grease nipple to the clutch arm. Greasing it stops water and road crap getting in and pushes any out.
Regards Martin.Oil leak Clutch10


4Back to top Go down   Oil leak Empty Re: Oil leak Tue Oct 17, 2017 8:46 am


Life time member
Life time member
Be careful removing the gearbox on your K75. Unlike the K100 you can't remove the clutch push-rod first and it very easily damaged. Get three or four 8mm studs at least 100mm long to replace the GB bolts as you remove them and slide the GB back clear of the push-rod.

There's a special tool for aligning the clutch when reinstalling. If you have one.... throw it away. Its easier to do it by eye.

After you've removed the swing arm, clean out the pivot bearings and check for any slack or side movement. If they're ok pack them really well with new grease.


1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 Oil leak Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90

5Back to top Go down   Oil leak Empty Re: Oil leak Tue Oct 17, 2017 5:10 pm


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Fantastic! Thanks very much for the advice. That'll all be built into my planning!
I'll probably give myself a couple of days so I hopefully won't be to rushed.


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