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BMW R-Series Discussions of the Boxers EXCEPT the GS/GSA

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  #1  
Old 11-06-2016, 12:49 PM
MMathison MMathison is offline
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1994 R1100RS Misting Oil Out Rear

Took my recent acquisition for a 300 mile ride. Bike has oil on rear components: exhaust pipe, shaft drive, rim. Any thoughts as to cause? 55,000 miles on bike that had owned by a BMW mechanic. Bike also has a strong smell of gas, but doesn't seem to be leaking anyway.
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Mark
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  #2  
Old 11-06-2016, 01:57 PM
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Re: 1994 R1100RS Misting Oil Out Rear

Contact the PO and ask him some questions. Perhaps even pay him to fix it? With oil anywhere near the rear tire, I wouldn't ride it.
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Old 11-06-2016, 04:22 PM
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Re: 1994 R1100RS Misting Oil Out Rear

Mine leaked from the final drive seal once. Blamed it on me riding in rain on dirt road.
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Old 11-06-2016, 06:17 PM
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Re: 1994 R1100RS Misting Oil Out Rear

Quote:
Originally Posted by cousi
Mine leaked from the final drive seal once. Blamed it on me riding in rain on dirt road.
Whaaat?
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  #5  
Old 11-06-2016, 07:06 PM
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Re: 1994 R1100RS Misting Oil Out Rear

Quote:
Originally Posted by MMathison
Took my recent acquisition for a 300 mile ride. Bike has oil on rear components: exhaust pipe, shaft drive, rim. Any thoughts as to cause? 55,000 miles on bike that had owned by a BMW mechanic. Bike also has a strong smell of gas, but doesn't seem to be leaking anyway.
Where on the exhaust pipe?
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  #6  
Old 11-06-2016, 11:29 PM
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Re: 1994 R1100RS Misting Oil Out Rear

I fell in love with a blue one (1992??) it was a piece of junk. Good luck. I still see them on the road though.
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Old 11-07-2016, 07:06 AM
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Re: 1994 R1100RS Misting Oil Out Rear

Quote:
Originally Posted by Beech
I fell in love with a blue one (1992??) it was a piece of junk. Good luck. I still see them on the road though.

1994 was the first year in the USA I believe.
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Old 11-24-2016, 06:43 PM
Lowndes Lowndes is offline
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Re: 1994 R1100RS Misting Oil Out Rear

MMathison,

I had a very similar problem with my '99 R1100S, with only 11K miles, this summer. Oil on the rim, right side mostly, and elsewhere. I believe our bikes share very similar paralever and final drive components.

I read a bunch about oils and compatibility with the seals used during this time (1990's). It seems that synthetic oils leach the softeners from the polymer seals leaving them hard and much less able to respond to minute movement, and faster wear. Newer seals use polymers that resist the effects of syn oil.

The PO of my bike claimed that all lube had been replaced with syn oil. So, I replaced the large 5" dia rear wheel seal (Bob's BMW # 01 33 12 7663482 Shaft seal 85X110X10 1 ea $41.62), EZ job, maybe 2 hours, remove the wheel and hub only, replace the seal, and lubed with dino oil. That fixed mine.

Then the pinion shaft seal began a slow drip from paralever boot. THAT seal is a pain. I'll just check and add lube for now on that one. Not much mess, just the FD housing arm for the paralever.

If you still have the OEM brake lines, you're living on borrowed time.

Good luck!!


Lowndes
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Old 11-24-2016, 11:36 PM
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Re: 1994 R1100RS Misting Oil Out Rear

Get a couple cans of spray brake cleaner an de grease your bike. Go for a short ride, 5 minutes or so, come back and look. If nothing ride longer. Spray foot powder on clean suspected sections will show the smallest seepage. Transmission and final drive oil smell sulphur like. Rub your finger in it and take a sniff.
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Old 12-29-2016, 02:07 PM
MMathison MMathison is offline
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Re: 1994 R1100RS Misting Oil Out Rear

Thanks all--going will probably replace 'easy' seal and watch it thereafter. Mark
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Old 05-02-2017, 09:34 PM
MMathison MMathison is offline
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Re: 1994 R1100RS Misting Oil Out Rear

turned out that it was the pinion seal for the oil misting around the final drive area. The gas smell turned into a gas leak. The fuel distributor and pressure regulator were replaced. These items and the brake bleed resulted in $860 bill.
Separate subject: With the caveat that this is a 3d 'for fun' bike (therefore not intended for long trips)--and because I have only had it out for one long day, the jury is still out on whether or not I will keep it. The low bars result in some neck pain and it is a bit tight on the bike; but the after-market suspension (weber?), handling, torque, relatively light weight is all quite excellent. The Corbin seat is worthless for a passenger (7" butt room vs. 11" stock seat), but I would need a backrest before my wife even thinks of getting on it. Would be nice, because she likes the bike (vs. the Valkyrie which is bit noisy for her). We'll see...either I keep it or go for an RT, Triumph Trophy and even a Moto Guzzi Norge.
Mark
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Old 05-31-2017, 07:58 PM
Lowndes Lowndes is offline
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Re: 1994 R1100RS Misting Oil Out Rear

$860!!!??? OUCH.

Mostly labor, I'd imagine. The pinion seal is a pain. I had a weep in my pinion seal, '99 R1100S, changed to a dino oil from syn and it stopped. Too late to try that on yours.

Where on the "Fuel Distributor" was it leaking, did they say?? A split in a line or the pressure reg valve??

Corbin made a dual seat with a backrest for the R1100S. I had one, sold it to a member, cheap. Never used it. He loves it. You might look for one for the RS. I have the Corbin solo and really like it. Very comfortable.
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Old 06-05-2017, 09:25 PM
MMathison MMathison is offline
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Re: 1994 R1100RS Misting Oil Out Rear

$240 labor/3 hours pinion seal: though mechanic did thorough look at shaft to ensure it was the pinion seal. Leaking fuel was fuel distributor ($140) and Pressure regulator ($102). I also had brakes bled--so not unhappy with the total.
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