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Old 07-25-2012, 04:19 PM   #1
scootac OP
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Greasy Airhead wheel--WHY?

OK,,, this started last fall,,, finally getting around to taking things apart.
The facts: '81 R100RT,,, 116K miles. A little ride showed oil/grease thrown out around the rim of the rear wheel. Got it back home without a problem. It's been sitting since,,, doesn't show any dripping where it's parked. So I decided to tear things apart,,, and with the help of all you Airheads,,, hopefully get it back on the road where it belongs!
So here's some pics of my problem,,,

The rim with the oil and dirt...















And finally,,, a drop!!!


I'm a long ways from being a mechanic,,, but things look OK to me till the last pic where there's finally leakage. So question is,,, what's next? I looked at a parts fiche and see there's gaskets and bearings hiding in there,,, so I'm assuming/hoping they need replaced and things will be fine and dry!?!!? How hard is it to tear this apart and replace those parts? Any special tools needed? I did put a socket to the 8 bolts and each one loosened up. Maybe that's why I got a drip to show though? There had been no gear oil on the floor under the bike until I took the wheel off and loosened those 8 bolts. Are the bearings pressed on/off? What else do I need to know before getting in too deep? Is there something I'm missing and it's something besides gaskets and bearings?
Help me get this beast up and running down the road!
THANKS for any help and advice!!!
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Old 07-25-2012, 04:50 PM   #2
wirewrkr
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For starters there's waaay too much spline lube on them splines. It's slinging right off.
I would just reseal the out put seal and the cover gasket and go from there. It ain't rocket science.
Buut if your not comfortable, pay an expert to do it.
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Old 07-25-2012, 05:08 PM   #3
Beater
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1. The grease is due to a PO or you loading those splines up with grease ... and not quite getting it into the grooves. because it didn't quite get in there ... it slung off due to the centrifugal force of the wheel spinning. This isn't bad per se ... but next time you really want to get it into the bottom of that wheels splines. The splines need grease, and some of it can (will?) fly off. If you don't like it, get a monolever.

2. The oil drip. This is fixable ... and not too bad. In the parts fische there is a large O-Ring that goes around the outside of that spline. It is faulty. If all of the oil gets out ... then your final drive WILL fail. An that would be really bad. It's also not hard to tackle yourself. There are a number of bolts around the outside of the disc that appears to hold it all together. Take those off, and the o-ring is inside.
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Old 07-25-2012, 05:26 PM   #4
Beater
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Damn. I owe you a beer.
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Old 07-25-2012, 05:28 PM   #5
Wirespokes
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My first thought was the spline lube. And after reading your explanation for the drip my thought is to make sure those 8 bolts are tight and leave it alone!

Clean off all that grease really well and apply some spline lube (doesn't take much - just a thin film) and call it good. Google 'Snowbum BMW', go to his search page, search for spline lube and he's listed a few that work well.

Lots of guys use a 50/50 mix of Honda Moly 60 and Chevron blue industrial grease. I don't recall the name of it, but it's pretty stringy, and that's what you want.

BTW, those are some beautiful splines! They must have recently been renewed.
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Old 07-26-2012, 01:37 AM   #6
ME 109
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Yeah, love those splines!
Too much grease.
Could be the oil seal too.

I'm thinking oil leak due to spline replacement....

O ring? where's that?
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Old 07-26-2012, 03:15 AM   #7
boxerboy81
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No o-ring, just a gasket between the cover and the body of the fd.

I'd take the cover off and inspect and replace the gasket.
In the meantime, if delivery is gonna be a while, I'd re-torque those cover bolts, clean everything up, ride and watch what happens.




From your pictures, it looks ok.
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Old 07-26-2012, 06:52 AM   #8
scootac OP
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THANKS everybody!!!
I'll try to take those 8 bolts out and take that cover off,,, see what I find next.
It doesn't sound like that should give me trouble,,, be able to see some seals at the point I guess. Thanks for the advice about greasing the splines too. I'll clean them off and re-grease.
THANKS again!!!!
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