BMW K bikes (Bricks)

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

Chayko

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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    Re: [solved]K75 leaking rad on Sun Oct 21, 2018 1:22 pm

Point-Seven-five

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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:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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

Dai

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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/


__________________________________________________
'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)
    

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

Snod Blatter

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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 Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

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

brickrider2

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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.


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1996 K1100LT
    

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

K75cster

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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


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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    Re: [solved]K75 leaking rad on Fri Oct 26, 2018 6:09 am

charlie99

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@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 ??


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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
    

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

brickrider2

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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


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1996 K1100LT
    

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

Snod Blatter

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@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 Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

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

Chayko

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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    Re: [solved]K75 leaking rad on Sat Oct 27, 2018 4:06 am

RicK G

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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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

Dai

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


__________________________________________________
'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)
    

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