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51
The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Ingo on May 08, 2026, 03:19:35 PM »
I've never had that particular area apart, but nonetheless follow the manual.  There are plenty of parts that need heat and/or freezing for removal/install. For example steering bearings, certain housing covers like on the old boxer's gear box... This also applies to cars...
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The Motobrick Workshop / Re: The Dreaded Under-The-Tank 4 Pin Connector (85 K100rs)
« Last post by gard on May 08, 2026, 09:29:13 AM »
I got the new gears installed in odometer, seems to be working correctly. while in there I replaced all the instrument cluster bulbs with LED, the green backlite bulbs are sensitive to polarity so I checked each bulb with a battery and checked which side of each socket connected one of the 2 ground pins. Some bulbs flicker a little at idle but work fine on the road. The turning indicators are much lower power but they are directed out so it is fine.

I determined the male pins in the tank connector are 0.082" diameter so I used a 0.080" metal pin to check that each of the female pins are compressed to be a snug fit. All connections under tank, fuel relay, ECU, FI and inside instrument cluster cleaned and hit with deoxit.

Bike is running good after all the tune-up work last year, waiting for it to stop raining and get a little warmer.

Need new tires now. Sigh, it seems like every time I turn around its another $100 or 3
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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Laitch on May 07, 2026, 12:04:01 PM »
Just follow the instructions. Some components in both autos and motos are heated either to release, or fit, by expansion. Bricks are no exception. Also, in Bricks BMW occasionally used a type of Loctite on some fasteners that must be heated so the fastener can be unscrewed. Ignore all this and you'll likely be spending more time than usual with screw extractors, drills and torches.

You and Toto aren't in Kansas anymore.
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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Kevin1100 on May 07, 2026, 10:55:05 AM »
Haha that's fair, it's actually a pdf copy I'm more than happy to share with anybody who would like one too. I will rephrase my question. I have never seen the need to heat components on the cars I've worked on in the past. Since from the diagram it seems that it's parts bolted together, what does the heating do?
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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Laitch on May 07, 2026, 10:31:52 AM »
Quote from: Kevin1100 on May 07, 2026, 09:57:42 AM
The manual says to heat the housing cover to 100 degrees C, is that really necessary?
Somebody else might be able to put that manual to good use if you don't intend to believe it. Post it for sale for at no cost to anybody who is interested in it on eBay.nl. Consider that as your good deed for this month. :laughing4-giggles:
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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Kevin1100 on May 07, 2026, 09:57:42 AM »
That's awesome guys, thanks both. Looks to be a pretty simple job, or am I mistaken? From what I can gather it's a question of removing the brake disc and the crown wheel housing cover and it'd be the first thing I see. The manual says to heat the housing cover to 100 degrees C, is that really necessary? And is this job doable while keeping the bearings in place or would I need new bearings as well? They seem quite costly and mine are in good order still as far as I can tell.
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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Laitch on May 07, 2026, 09:13:38 AM »
Quote from: Scott_ on May 07, 2026, 08:14:41 AM
https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51711&rnd=10232024
part #1.

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The Motobrick Workshop / Re: Leaky seal on rear drive? K1100LT
« Last post by Scott_ on May 07, 2026, 08:14:41 AM »
https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51711&rnd=10232024

part #1.
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The Motobrick Workshop / Leaky seal on rear drive? K1100LT
« Last post by Kevin1100 on May 07, 2026, 04:02:48 AM »
This is the first bike I have (and have worked on). I have quite a bit of experience working on old cars but on this bike I'm still trying to find out what is what exactly. When taking the rear wheel off I noticed the wheel bolts were wet with fresh oil (I have replaced the final drive oil recently). At that point I wasn't sure if that was a problem or maybe that's normal on these bikes, but then I found a lot of greasy old oil on the brake disc as well. I have added a picture on which you can see black sooty grease behind the ABS ring and also in the brake disc vent holes. It's no big leak because there's no dripping or anything but an oily brake disc is not something I see as a wortwhile mod to this bike. I've been looking online a bit but can't find exactly what my problem might be. It's probably just a seal behind the brake disc but I was wondering if you all might be able to give me some pointers in the right direction, for example what the name of the seal would be. The PO kindly gave me his BMW service manual too which I have found helpful up until this point. It's great if you know what you are looking for, less great if you are grasping.

Thanks in advance!
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The Motobrick Workshop / Re: K100RS running hot
« Last post by Laitch on May 03, 2026, 09:04:56 PM »
Thanks for the update. You've got the touch, by Glory; happy trails!
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