BMW K bikes (Bricks)

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JDiggamus

JDiggamus
active member
active member
Hello,  I just got a 1984 BMW K100RS 4 days ago and I wanted to do some routine maintenance/service since the bike was sitting in a garage for nearly 10 years prior to me getting it.  I started off with lubing the splines, however, when it came time to remove the swing arm for the final drive I couldn't.  I removed all four bolts, 2 were pretty rusted the others were in decent shape.  Based on the research I've done, most say you should be able to wiggle and shake the final drive and swing arm loose in order to separate them.  No such luck.  It's sealed pretty tightly and looks to be seized. I sprayed some PB blaster in the bolt holes and on and around the seam a bunch, let it sit then blasted it again.  I was able to get a little wiggle after that but barely any.  I cant fit a screwdriver in the seem in order to pry it open.  I ordered some Kroil to help cut through the rust, hopefully, that will do better than PB Blaster.  I took a rubber mallet to it but didn't want to hit it too hard in fear of damaging the final drive. 

Anyone experience this problem before?  Does anyone have any recommendations?  

Thanks!!

    

duck

duck
Life time member
Life time member
Since you never know what prior owners have done it is possible that somebody put some sort of adhesive or sealant on that surface.

Banging the final drive with a rubber mallet won't hurt it.

Another thing to try would be putting the bolts back in part way and tapping them with a hammer (within reason) to back the final drive off.

If you have a knife that you don't care about then you might try tapping that into the seam once you get a little opening.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

charlie99

charlie99
VIP
VIP
could the po have run some sealant around the joint between the final drive and swing arm ?

don't forget here are 2 x locating dowels on the final drive that , if corroded could be adding some resistance to separation and movement

good luck


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFinal Drive and Swing arm are seized. Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

duck

duck
Life time member
Life time member
@charlie99 wrote:don't forget here are 2 x locating dowels on the final drive that , if corroded could be adding some resistance to separation and movement

good luck

Good point. The final drive needs to come straight back to come off since those dowels won't allow for twisting.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

RicK G

RicK G
admin
admin
Yeah give it a darn good flogging with a rubber hammer and make sure to catch it before it hits the floor.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I like Duck's suggestion to put the bolts back in and hammer on the heads.  Just make sure to have them almost all the way in.  A 1/16th inch of play is all you need.  A hardwood block and a heavy hammer should do the trick.

It might be wise to use four disposable bolts to prevent damage to the good ones.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Heat is yo friend.


__________________________________________________

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-P  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

Laitch

Laitch
Life time member
Life time member
If the final drive input shaft is seized to the driveshaft by corrosion, using wheel rotation snapped backward and forward several times to fracture the bond created by corrosion within the splines then pounding on the final drive with Thrash Metal vigor using a dead blow hammer might produce enough vibration to free it up.


__________________________________________________
1995 K75 81,000 miles
Final Drive and Swing arm are seized. Usa-lo10
    

charlie99

charlie99
VIP
VIP
@Laitch wrote: then pounding on the final drive with Thrash Metal vigor using a dead blow hammer might produce enough vibration to free it up.
Final Drive and Swing arm are seized. 44271


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFinal Drive and Swing arm are seized. Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

duck

duck
Life time member
Life time member
Before you remove the final drive it's a good idea to drain the gear oil from it.  If you don't then you have to keep it upright to keep gear oil from leaking out of the breather hole at the top if you put it on its side.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

duck

duck
Life time member
Life time member
@Two Wheels Better wrote:Heat is yo friend.


Really? On a K bike?  Do you have asbestos knees?  Laughing


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

12Back to top Go down   Final Drive and Swing arm are seized. Empty Final Drive and Swing arm are seized. Tue Jan 08, 2019 2:16 am

JDiggamus

JDiggamus
active member
active member
Thanks to all who have replied.  All great suggestions, I will exhaust them all until I get the damn thing separated.  Ill report back once I do to let you all know what did the trick.

    

92KK 84WW Olaf

avatar
Life time member
Life time member
Dowels can seize as said and IMHO that's the most likely cause of the problem. Heat first, then you could slacken the bolts very slightly, do them back up almost hand tight and do a slow ride on it to see if it will crack what is likely to be corrosion between dowels and the aluminium. Knife in there definitely wont separate it.

Will watch this one as its on my list for my new 83 K100RS.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

14Back to top Go down   Final Drive and Swing arm are seized. Empty Problem Solved! Wed Mar 06, 2019 5:07 pm

JDiggamus

JDiggamus
active member
active member
Hi all, sorry for the delay but I was able to fix the problem.  I bought some "Kroil" and wiggled the swing arm and also whacked it with a rubber mallet until I was able to get some give and then I poured some kroil into the creases.  Rinsed and repeat.

Thanks for all your help!

Splines were in great shape btw


__________________________________________________
--------------------------------------------
1984 BMW K100RS
Los Angeles, CA
last 7 of VIN# 0019268
;BMW;
    

Dai

Dai
Life time member
Life time member
Well, there's good news! Very Happy


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

charlie99

charlie99
VIP
VIP
Final Drive and Swing arm are seized. 112350


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFinal Drive and Swing arm are seized. Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

brickrider2

brickrider2
Life time member
Life time member
"Splines were in great shape btw"


How many miles are on the clock?


__________________________________________________
1996 K1100LT
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Big thumb


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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