BMW K bikes (Bricks)


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1Back to top Go down   [solved]K75 leaking rad Empty [solved]K75 leaking rad Sun Oct 21, 2018 12:26 pm

Chayko

Chayko
active member
active member
My k75 has just developed a leak on the lower rt side between the metal rad body and the plastic side- looks like the seal behind the metal to plastic crimping has failed. Is this repairable?

Thanks
Bob

    

2Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Sun Oct 21, 2018 1:22 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I would get a used radiator.  Radiator leaks are pretty rare, yours is the first I've seen in a number of years on forums.   Replacing your leaky one is the fastest, most reliable fix.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Sun Oct 21, 2018 9:45 pm

Dai

Dai
Life time member
Life time member
The radiator on LFB sprang a leak earlier this year, about 6000 miles ago. I chucked a bottle of Radweld in and that sorted the problem. Mind you, there's a backup radiator hanging on the wall just in case, but Murphy says I'll never need it now.

https://www.holtsauto.com/holts/news/radweld-work/


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

4Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Thu Oct 25, 2018 6:45 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
Mine split a couple of years ago, after some searching on ebay I got an 1100 radiator (complete with cap, the final revision and the one that actually reliably works!) for £35. There are loads of them about, but for you I guess postage may be an issue?


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL, '01 R1100GS
http://justbikethings.blogspot.co.uk/
    

5Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Thu Oct 25, 2018 7:58 pm

brickrider2

brickrider2
Life time member
Life time member
Can you describe the "final revision?"  I was under the impression that the only change made to the radiators was when the early 3-row models were later replaced by 2-row radiators.  
There are all aluminum radiators on offer on eBay.  They apparently are made in China.  They are quite nice in appearance.  I wonder who has had personal experience with one.


__________________________________________________
1996 K1100LT
    

6Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Fri Oct 26, 2018 5:42 am

K75cster

K75cster
Life time member
Life time member
You should be aware that a K75 radiator is about 290mm across it and the K100 is about 330mm, if you have a K75 with a radiator cowling it will matter.
On the other hand it might just need a squeeze to re-crimp it


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

7Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Fri Oct 26, 2018 6:09 am

charlie99

charlie99
VIP
VIP
brickrider2 wrote:Can you describe the "final revision?"  I was under the impression that the only change made to the radiators was when the early 3-row models were later replaced by 2-row radiators.  
There are all aluminum radiators on offer on eBay.  They apparently are made in China.  They are quite nice in appearance.  I wonder who has had personal experience with one.

i have seen pics of the insides of one of those radiators
and I wouldn't be ordering one at all ..

whilst the outsides looks fine   the finish is crappy internally with dags of metal obvious everywhere ...they might indeed work , but for how long ??


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

8Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Fri Oct 26, 2018 12:22 pm

brickrider2

brickrider2
Life time member
Life time member
That's unwelcome news indeed, Charlie.  If (when?) the OEM radiator goes tits up, there are few options apart from very expensive BMW spares.  I've tried to repair a couple of K100 radiators and both were failures.  Sad


__________________________________________________
1996 K1100LT
    

9Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Fri Oct 26, 2018 6:50 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
brickrider2 wrote:Can you describe the "final revision?"
I think there are three versions of rad cap, maybe four. They get progressively better at working/not blocking up until the final version which came on the 1100s which finally seems to be reliable. Mine had started to collapse the pipe that goes through the crank cover as the system couldn't breathe in and was a vacuum - it seems to be a common complaint.

As an aside, mine has run rich/cold ever since I fitted the later radiator - anyone know if this is normal? I am cretinous enough to have reused the washers on the temperature sensor/plug though so it could well just be that making the connection a higher resistance than it should be.


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL, '01 R1100GS
http://justbikethings.blogspot.co.uk/
    

10Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Sat Oct 27, 2018 3:38 am

Chayko

Chayko
active member
active member
An update on the leaky radx turns out there is nothing wrong with the rad, a pinhole leak in the rad hose was the issue - has been replaced and all is now drip free. Thanks for the comments and suggestions!
Bob

    

11Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Sat Oct 27, 2018 4:06 am

Rick G

Rick G
admin
admin
[solved]K75 leaking rad 212902


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

12Back to top Go down   [solved]K75 leaking rad Empty Re: [solved]K75 leaking rad Sat Oct 27, 2018 6:41 am

Dai

Dai
Life time member
Life time member
Isn't it nice to find it's the cheap/easy bit! Very Happy


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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