BMW K bikes (Bricks)


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MartinW

MartinW
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Life time member
The sight glass on my K75's overflow tank is full of fatigue cracks. I ran an ad a few months ago chasing a replacement to no avail. A mate has got four of them in much the same condition. I was waiting for Motorworks to reopen. However I got a bit bored today and decided to have a crack at milling one out of a piece of round 25mm clear acrylic. I have access to a turret mill when the Trades Guild is open but they are currently closed for Christmas New Year.

So I reverted to my trusty drill press with it's cross slide vice. I have previously milled aluminium and wood on it. I used router bits in the drill press and finished it off with files and a bench grinder with buff wheels and polishing compound. I will give it a bit more buffing tomorrow and will eventually remove the tank and replace the old one with the new one. I'm pretty happy with how it came out, I did pick up a couple of tips from a couple of guild members. When milling acrylic there is no need for high speed and keep spraying it with WD 40. This will stop it sticking to the tool and the job and helps in keeping it's clarity. One of the guild guys did offer to make one on his small CNC machine but where's the fun in that.
Happy New Year regards Martin.
Radiator Overflow Tank Sight Glass Replacement. Pc310011
Radiator Overflow Tank Sight Glass Replacement. Pc310010


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1992 K75s
    

duck

duck
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Life time member
That's some pretty impressive DIY. cheers


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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
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
    

MartinW

MartinW
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Life time member
Thanks Duck but once I got going it wasn't that hard. The cross slide vice is one of my better investments, and the tip with the WD40 really helped. It stopped the swarf from melting onto the tool and the job, which was a problem when I previously tried to cut acrylic. I just have to make slight adjustments to make the ends equal and uniform. Then I can carefully cut off the old sight glass and glue on the new one. I'm thinking of using black Sikaflex but that will have to wait till tomorrow as it's New years day and the shops are closed.

Happy New year regards Martin.


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1992 K75s
    

Crazy Frog

Crazy Frog
admin
admin
like Big thumb


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Radiator Overflow Tank Sight Glass Replacement. Frog15Radiator Overflow Tank Sight Glass Replacement. Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

Rick G

Rick G
admin
admin
Instead of Sikaflex try Bostic "seal n flex" it is exactly the same and half the price


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"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
    

MartinW

MartinW
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Life time member
Thanks Rick I have just looked at the price $19.00 Au for a small tube.
Happy New Year regards Martin.


__________________________________________________
1992 K75s
    

MartinW

MartinW
Life time member
Life time member
Rick I ended up with Selley's polyeurethane Flexseal $11.30 Au a tube from Bunnings. Sight glass all finished and installed. I used a mini cut off disc saw and a 1/4" air burr grinder to remove most of the old sight glass. The tank is recessed into
sight glass so care is needed trying to grind off the edge of the glass. So as not to damage the body of the tank I hot glued pieces of an old hacksaw blade to the tank. This made the hole process a lot easier and safer. I started off gluing the hacksaw blade at an angle eo do the ends but ended up just holding the blade while grinding off the excess. The blade can be lifted off the tank easily and the glue easily removed.

As I was unsure of what to expect once the old sight glass was removed I had left the of the new one just flat. I ended up just milling it out to a depth of 3mm with a 2.5mm rim. A bit more polishing with a 1/8" air burr and mop ensued on the recess which probably wasn't needed. After making sure it was a good fit I cleaned up both bits with wax and grease remover . I ran small bead of sealant in the corner of the recess smoothed it out evenly with my finger and stuck it on. I'm very happy with he end result and hopefully it will out last me.
Regards Martin.Radiator Overflow Tank Sight Glass Replacement. P1020012
Radiator Overflow Tank Sight Glass Replacement. P1020010
Radiator Overflow Tank Sight Glass Replacement. P1020011
Radiator Overflow Tank Sight Glass Replacement. P1020014
Radiator Overflow Tank Sight Glass Replacement. P1020013


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1992 K75s
    

redrockmania

redrockmania
Silver member
Silver member
I wonder if clear Silicone tubing can't be used as a replacement. Several manufacturers rate their silicone tubing as coping with 200C temperatures with short term max temperatures of 260C. Anyone tried clear silicone tubing as a replacement?

    

MartinW

MartinW
Life time member
Life time member
There are two types of sight glass one is the tube type and can be replaced. The other is the built in clear acrylic type built into the tank which is deemed non replaceable. My home made one is still going.
Regards Martin.


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1992 K75s
    

redrockmania

redrockmania
Silver member
Silver member
Thanks MartinW for your excellent earlier posts on making a replacement sight glass for the later model radiator overflow tank. My 2 overflow tanks are the earlier types with the clear tube used. I've decided to proceed with clear silicone tubing as replacements on the basis of their superior heat tolerance. I'm still interested in tube type used by those who have done a replacement:- type of tube used, how long ago, how the replacement is performing.

    

Dai

Dai
Life time member
Life time member
I replaced LFB's tube with silicon about eight-nine years ago. You can still see the coolant level pretty clearly but the tube is getting slightly clouded from the crap that's come off the inside of the radiator. You're never going to avoid that.


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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
    

92KK 84WW Olaf

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I have some tube in my shed and have done some but I have two more now to do.

No idea what the tube is though, 88 [Will Crean] gave it to me a long time ago.


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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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 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
    

88

88
Life time member
Life time member
92KK 84WW Olaf wrote:I have some tube in my shed and have done some but I have two more now to do.

No idea what the tube is though, 88 [Will Crean] gave it to me a long time ago.

So long ago I cant remember Olaf but I think it came off a drain cleaning kit. Either way the hose only works for those later type expansion bottles. The one above is the sight glass type.


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Radiator Overflow Tank Sight Glass Replacement. Ir-log1188....May contain nuts!Radiator Overflow Tank Sight Glass Replacement. Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1 - 1989 - AKA Titan (unique K1/K1100RS hybrid by Andreas Esterhammer)
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K100RS - 1991 AKA Ronnie. Cafe racer project bike
K75RTP - 1994
K75C - 1991 AKA Jim Beam. In boxes. 
K1100LT 1992 - AKA Big Red (gone)
K100LT - 1988 - AKA the Bullion brick. Should never have sold it.
    

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