BMW K bikes (Bricks)


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1Back to top Go down   cooling fan Empty cooling fan Today at 12:21 am

letsgetpractical

letsgetpractical
active member
active member
My cooling fan comes on when I am stuck in traffic for more than 1 minute even when outside temp under 60 F.  I some how remember it not coming on in cooler temperatures but I may be mistaken.


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I own a 1985 KRT 100 Bmw
    

2Back to top Go down   cooling fan Empty Re: cooling fan Today at 8:21 am

92KK 84WW Olaf

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Life time member
If the fan comes on and not the warning light then its doing what is should.

Maybe a cooling system flush and fresh coolant might be in order and check you have the system full and no air locks.

I imagine you have the cast water pump impeller, not much to go wrong on it. But a sticky thermostat could give you issues so check out the rad cap seal and the thermostat.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

3Back to top Go down   cooling fan Empty Re: cooling fan Today at 10:19 am

Dai

Dai
Life time member
Life time member
If the bike does have the cast iron impeller then it can turn into a lump of rust and pretty much stop pushing coolant around. I wish I'd kept or photographed the one I took out of LFB; it literally was just a lump of rust. I spent hours cleaning it and then binned it anyway for the better pressed steel one. It's worth taking a look and it's an easy job. All you need is a 5mm allen key and a tube of RTV to reseal the pump cover.

Oh - and either new coolant or a clean bucket to catch the current lot in Very Happy Fastest way to drain the coolant is to pull the pipe off the side of the pump. It will take hours if you use the official method of taking out the 6mm drain bolt.


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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
    

4Back to top Go down   cooling fan Empty Re: cooling fan Today at 3:41 pm

letsgetpractical

letsgetpractical
active member
active member
Dai wrote:If the bike does have the cast iron impeller then it can turn into a lump of rust and pretty much stop pushing coolant around. I wish I'd kept or photographed the one I took out of LFB; it literally was just a lump of rust. I spent hours cleaning it and then binned it anyway for the better pressed steel one. It's worth taking a look and it's an easy job. All you need is a 5mm allen key and a tube of RTV to reseal the pump cover.

Oh - and either new coolant or a clean bucket to catch the current lot in Very Happy Fastest way to drain the coolant is to pull the pipe off the side of the pump. It will take hours if you use the official method of taking out the 6mm drain bolt.
thats good advice, will have to check that out.


__________________________________________________
I own a 1985 KRT 100 Bmw
    

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