BMW K bikes (Bricks)


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1Back to top Go down    battery holder on Fri Apr 08, 2016 5:15 pm

riddle the sphinx

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the lower half of the battery clamp, the alloy plate the battery sits on...

(bikes a 88' K100 LT)

on mine this is only secured to the transmission box by one bolt, front right. the others hold rubber mounts that just sit on top the transmission. I have a feeling that these other mount should also be attached to the trans, do these need replaced or is this normal?

cheers

Brett

    

2Back to top Go down    Re: battery holder on Fri Apr 08, 2016 5:54 pm

indian036

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All being original, the rubber mounts have a 6mm threaded post top and bottom. The bottom one screws into threaded holes in the gearbox top, the top one goes through the battery carrier and is held on by a nut.

Common enough for the threads on the posts to be worn or corroded away. Maybe 3 or 4 new rubber mounts needed, and hopefully the threads in the gearbox are ok.

I had to do a similar job on Bob the Blue Old Bike recently.

Bill


__________________________________________________
1985 K100RT VIN 0028991 My original Very Happy (Historic rego)
1985 K100RT VIN 0029036 BOB the Blue Old Bike (Historic rego)
1990 K100LT VIN 0190452 Work in progress
1984 K100RT VIN 0023022 Work needing lots of progress

1986 K100RT VIN 0090542 Work needing lots and lots of progress
1993 K1100LT VIN 0183046 Work in progress
1993 K75S VIN 0213045 Newest toy, slightly non-original
    

3Back to top Go down    Re: battery holder on Fri Apr 08, 2016 6:10 pm

Holister

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You can buy 6mm rubber bobbins cheap enough from Motorworks although most engineer supply companies would have something similar. They're on my list for replacement
Motorworks part No FRA33028
http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=6&Q=battery+mount&x=0&y=0

If the rubber is busted it could be a bit of an issue getting them out of the GB housing if there is corrosion. a soak in something penetrating will help.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

4Back to top Go down    Re: battery holder on Fri Apr 08, 2016 6:22 pm

riddle the sphinx

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yeah so it seems I have 3 part rubbers stuck in the bell housing. happy days. I didn't think this was right. any tips on removing the remaining rubbers and bolt? if I scrape the rubber off, whats the chances of enough threaded bar sticking out to get some grips on?

    

5Back to top Go down    Re: battery holder on Fri Apr 08, 2016 10:06 pm

RicK G

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There will be a small plate on the top of the threaded section, welded to it, and you can sometimes get a hold usung vise grips or use a small cold chisle to knock it undone far enough to get hold of it.
those rubber mounts are very common on many GM cars they are used under the air box. They are a tad longer so you need to use 4, you cant mix them.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

6Back to top Go down    Re: battery holder on Sat Apr 09, 2016 3:21 pm

Dai

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Before you cut the rubber off, try gripping then with molegrips or a pipe wrench and twist/pull. Based on my own experience my bet is that they will come out straight. The threads on the anti-vib mounts will be completely rusted away and all that's holding them in is corrosion. Hopefull you'll find that the threads in the gearbox are intact but you will need to clean them up with a 6mm x 1mm tap before screwing new ones in.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

7Back to top Go down    Re: battery holder on Sat Apr 09, 2016 4:44 pm

riddle the sphinx

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@Dai wrote:Before you cut the rubber off, try gripping then with molegrips or a pipe wrench and twist/pull. Based on my own experience my bet is that they will come out straight. The threads on the anti-vib mounts will be completely rusted away and all that's holding them in is corrosion. Hopefull you'll find that the threads in the gearbox are intact but you will need to clean them up with a 6mm x 1mm tap before screwing new ones in.

funny enough, I just read about this in one of your posts, good info in there cheers.
new rubbers ordered. blown away by what beemer charge for them. obviously I went for the 2 quid version.
........actually i feel like a bit of a twat, I keep discovering something else needing replaced and instantly order it, I've paid 3 separate postage charges this week. nugget.


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'88 naked K100RT
    

8Back to top Go down    Re: battery holder on Fri Apr 15, 2016 6:55 pm

riddle the sphinx

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Right, you know one of those jobs that should only take 10 minutes...........

Bloody things. I've got 3 threads with domed ends locked solid. Fair play I tried to do it in a hurry whilst waiting for the wife but mole grips did nothing but chew them to peices so I decided to drill them and use the stud extractors. I've now got one with a broken extractor inside to deal with.

I'm done for today. I'll pick this up with a cool head and less time constraints.


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'88 naked K100RT
    

9Back to top Go down    Re: battery holder on Fri Apr 15, 2016 8:17 pm

WoodyAUK75

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Just attacked this job on mine, as I noticed the battery was resting against the rear guard. On my bike, the bobbins are in good nick, but the thread is gone out of the holes in the case. There is thread further down, so I will probably put some other rubbers there and bolt through them.

    

10Back to top Go down    Re: battery holder on Fri Apr 15, 2016 8:54 pm

charlie99

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rs components have many different rubberised stud type mounts

check here

http://au.rs-online.com/web/c/fasteners-fixings/levelling-vibration-control/stud-mounts/
I used one of their products to remount my battery tray ...just had to cut off the top stud length to suit
after retapping the lost threaded sections on the gearbox to get some grip ...as the first 12 mm or so was gone worked well


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

11Back to top Go down    Re: battery holder on Fri Apr 15, 2016 9:31 pm

WoodyAUK75

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Thanks Charlie, ordered some now.

    

12Back to top Go down    Re: battery holder on Sun Apr 17, 2016 1:43 pm

sidecar paul

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When I replaced my battery holder rubbers, I made some polythene washers to go between the metal disc of the new rubbers and the aluminium casing of the gearbox to reduce the chances of corrosion.

So, hopefully, the next time I need to replace them, I won't have to resort to a hammer and chisel to get them off the gearbox. affraid

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

13Back to top Go down    Re: battery holder on Sun Apr 17, 2016 7:55 pm

Holister

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I managed to get one of mine out without damage. Broke one and left the other 2 alone. The one I got out I applied some aluminium grease used on exhaust studs (like copper slip) on the thread. At least that one should come out easily when I get replacements.
Cheers


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

14Back to top Go down    Battery carrier rubbers on Mon Apr 18, 2016 6:12 am

Gordon Smith

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SPAREX Ltd, suppliers of agricultural mechanical parts have a choice of all sizes of rubber mounts in packs of 25. If there is an agricultural engineer in your locality try him or if not google Sparex. Price wise they are on a par with Lidl measured against Bmw. Hope this can be of use to anyone.

    

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