BMW K bikes (Bricks)

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1Back to top Go down   Radiator oxidation Empty Radiator oxidation Wed Jun 09, 2021 8:12 pm

bmwk100rs

bmwk100rs
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Hi everyone,

I recently purchased a 1987 K100RS with only 53K miles on it. The bike starts and runs fine, and it has not leaked fluids on the garage floor since I rode and parked it two weeks ago. Today, I started to do a full inspection to replaces fluids and any necessary part (e.g. bearing, seals, clutch, etc.).  However, the first thing I noticed it was the oxidation and water marks on the radiator. Is this normal on the K100s or could this be caused by a crack in the radiator or damaged hose or loose clamp.  Any advice on how to check or test it will be appreciated. TIA!

Radiator oxidation Img_0610
Radiator oxidation Img_0611

    

2Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Wed Jun 09, 2021 11:27 pm

Snod Blatter

Snod Blatter
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Considering the radiator and engine are made of aluminium I find the brown rust quite strange. Are you sure it hasn't just been splashed through a really muddy puddle or something?

When mine leaked (twice now..) I just had a wet patch in the fins and blue antifreeze crystals underneath the radiator. Nothing like this.


__________________________________________________
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/
    

3Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Wed Jun 09, 2021 11:46 pm

moriarti

moriarti
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No its not normal. Im thinking wrong antifreeze or caustic cleaner has been used. Remove rad. Flush and test including hoses.Sould you find a load of crap flush full system to be safe.


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

4Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Thu Jun 10, 2021 9:10 am

Dai

Dai
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I think that's possibly been splashed on from somewhere else. Check the grill on the lower front fairing - if that's rusty then it could be your discolouration source. Riding through a rusty puddle could also have done it. Also if the coolant has been in there for a long time I have also seen the inside of two radiators turn rust-coloured and the coolant came out looking lke a sluice from the Mississippi. It's obviously not a leak because otherwise as Snod says, you'd see a leak point.


__________________________________________________
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
    

5Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Thu Jun 10, 2021 5:05 pm

Laitch

Laitch
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That looks like arid-land deposits. Did you get it from around San Bernardino, from around Palm Springs or east of Escondido? Smile 

Disconnect the battery ground cable from the transmission after you've ridden it when you intend to put it away for days or weeks at a time. When the battery voltage drops, the starter relay contacts could fuse and you'll wonder why the starter won't shut off. If you habitually connect the battery to a battery tender that might be sufficient, if the battery is still in good condition. A battery isolator switch is a useful addition.


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1995 K75 81,000 miles
Radiator oxidation Usa-lo10
    

6Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Tue Jun 15, 2021 4:40 am

bmwk100rs

bmwk100rs
active member
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Thanks everyone for your comments and suggestions.  Today, I removed the radiator and used a compressor to blow out from the backside dirt and bugs. After that, I sprayed both sides with a garden hose on low pressure to flushed off the exterior.  It looks much better now (see pics below).  However, it seems that it's time to replace hoses and clamps for the engine intake L connection. Or, should I just clean them up and tie the clamps. What do you think?

Radiator oxidation Img_0711
Radiator oxidation Img_0712

Radiator oxidation Img_0713

    

7Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Tue Jun 15, 2021 11:23 am

Dai

Dai
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Life time member
Cooling system hoses usually survive years of abuse. I would, however, pull them off the thermostat housing and clean the ally spigot. It almost certainly looks worse than it really is, but as you're that far in anyway...

That radiator looks in really good condition, BTW.


__________________________________________________
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
    

8Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Tue Jun 15, 2021 12:21 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
+1 on Dai's advice. My experience is that the only way these hoses fail is through a crash.

Judging from the photos, I suspect hard water was used in the cooling system. Remove the hoses and all the cruddy cooling parts and do a vinegar soak for a couple hours followed by a good rinse.

Put everything back together and then do a complete cooling system flush with distilled water and vinegar to clean out the passages. You might have to do it a couple times to clean things out completely. Based on the mineral deposits in the photos this is critical to have good cooling.

Last, keep your fingers crossed that the water pump is still good.


__________________________________________________
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
    

9Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Tue Jun 15, 2021 1:28 pm

Laitch

Laitch
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Life time member
@bmwk100rs wrote: should I just clean them up and tie the clamps. What do you think?
I'm involved in coffee titration right now so comprehension is still slow. What is meant by tie the clamps?


__________________________________________________
1995 K75 81,000 miles
Radiator oxidation Usa-lo10
    

10Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Tue Jun 15, 2021 9:00 pm

bmwk100rs

bmwk100rs
active member
active member
@Laitch wrote:What is meant by tie the clamps?

Haha! I meant tighten the clamps!

Point-Seven-five + Dai wrote:Remove the hoses and do a vinegar soak for a couple hours followed by a good rinse.  Then, do a complete cooling system flush with distilled water and vinegar to clean out the passages.

Good suggestion, will do exactly that.

I'm also planning to rebuild the oil+water pump.

Thank you, both!

    

11Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Yesterday at 5:34 am

bmwk100rs

bmwk100rs
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After I removed the hoses to to do the vinegar soak, I noticed a little tube without any hose attached to it. Is that normal? Is it some kind of breather pipe?

Radiator oxidation Img_0715
Radiator oxidation Img_0714

    

12Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Yesterday at 8:33 am

Dai

Dai
Life time member
Life time member
That's for you special people in Cali-for-ni-a Very Happy . It's an emissions breather which I believe is specific to that state. Cap it off and ignore it.


__________________________________________________
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
    

13Back to top Go down   Radiator oxidation Empty Re: Radiator oxidation Today at 3:24 am

bmwk100rs

bmwk100rs
active member
active member
@Dai wrote:It's an emissions breather which I believe is specific to that state. Cap it off and ignore it.

Thanks Dai for confirming. Should it be connected to the hose that connects to the fuel tank?

Radiator oxidation Img_0717

    

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