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Old 06-13-2012, 12:50 PM   #1
JLeather OP
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Is there a thread or article on fixing oil leaks at the cooler lines?

My 1100GS has had some crust around the two lines that exit the block on the upper RH side. After a recent oil change it now leaks just enough to leave a few drips on my pants after a long ride. I ride this bike to work, so that's unacceptable. I see in quite a few threads where this is mentioned as a common leak, but I haven't found any articles or threads actually showing a fix. Are the O-rings a commonly available size, and is it a difficult job? Any pitfalls?
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Old 06-13-2012, 01:22 PM   #2
mouthfulloflake
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you could likely simply tighten the fixture slightly, but

according the parts fiche, its a 16x20 sealing ring, likely you could source something at a local auto parts store, copper or aluminum

( its a metal ring that the bolt goes thru)

64 cents,

10 07 11 9 963 252 GASKET RING - A16X20 (to 12/97) 3 $0.64
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Old 06-13-2012, 01:24 PM   #3
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Or do you mean the vent hose on the side opposite the starter?
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Old 01-09-2013, 06:27 AM   #4
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Well, just now got back around to this. I didn't want to risk damaging anything during riding season. My battery crapped out a few weeks ago (it's a WestCo from 2007) and since I had to take the tank off anyway I figured I'd address this.

The oil cooler line adapter that threads into the block was loose. In fact it was surprisingly loose. I unscrewed it fearing the worst but the threads in the block look fine and there are no cracks in the boss as far as I can tell. I have a couple questions before I put it back together. Looking at the microfiche it seems something was changed in '97 (my bike is a '95). The threaded adapter and the aluminum crush washer are only listed for up to '97 machines. There is no adapter or washer listed for post-'97 machines and the oil line changed in '97 as well. Does anyone know what changed and why? Was this leak a common problem with the '95 setup?

Also, there appeared to be some sort of sealant or threadlocker on the threaded adapter when I removed it. Anyone know what it was or may have been? I suppose it could have just been baked oil sludge but it seemed like a threadlocker of some sort. Also, I've had bad luck with some of the aluminum crush washers BMW likes. They require pretty high torque to seal properly, and on an older engine I'm always worried about stripping one again. My drain plugs all use plastic crush washers now with much success. Is the upper line the supply or return for the cooler? Could I get away with a plastic washer there, or atleast perhaps a copper one?
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Old 01-09-2013, 06:46 AM   #5
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The sensor on the top/right/forward part of the engine near the cooler line is the oil temp, right? While I'm here I think I'd like to replace that washer too, in case they're both leaking. Is it aluminum, and is it under much pressure?
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