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K100-forum.com » Technical, repair and troubleshooting » Electrical » Starting the fan replacement tomorrow! Any vids or primers around?

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SniperX

SniperX
Silver member
Silver member
Need to know what all has to come off so I don't over do it or remove bits that don't need to be removed. Is there a write up or a video where someone shows the process? I have all the parts.


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

duck

duck
Life time member
Life time member
Drain coolant.
Remove fairing lowers and radiator panel.
Remove the gas tank and unplug the fan connector under the left side of the tank.
Undo hose clamps on all hoses going into the radiator.
Remove 5mm Allen bolt that holds the top of the radiator to the frame.
Rotate the top of the radiator forward and down until it comes off of the rubbers at the bottom of it.
Remove the two screws that hold the bottom of the fan to the radiator and then pop the top of the fan off of the rubber at the top.


__________________________________________________
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
    

SniperX

SniperX
Silver member
Silver member
duck wrote:Drain coolant.
Remove fairing lowers and radiator panel.
Remove the gas tank and unplug the fan connector under the left side of the tank.
Undo hose clamps on all hoses going into the radiator.
Remove 5mm Allen bolt that holds the top of the radiator to the frame.
Rotate the top of the radiator forward and down until it comes off of the rubbers at the bottom of it.
Remove the two screws that hold the bottom of the fan to the radiator and then pop the top of the fan off of the rubber at the top.
Wow sounds easy thanks again Duck!

Cheers!!


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

Flip2

Flip2
Silver member
Silver member
Still in the process of getting my new fan and overide switches for it hooked up, was hoping I could start the bike up with the radiator off and airintake box loosely attached along with the gas tank and FICU hooked up but it didn't start , any obvious reason this won't work ? Wanted to try the circuit out for the switches before hand

    

duck

duck
Life time member
Life time member
You want to a run a motor without any coolant in it? affraid


__________________________________________________
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
    

Flip2

Flip2
Silver member
Silver member
Was under the impression a minute or so would be ok , is that terribly wrong?

    

Laitch

Laitch
Life time member
Life time member
Flip2 wrote:Was under the impression a minute or so would be ok . . .
Where did you get that impression?


__________________________________________________
1995 K75 90,000 miles
    

Flip2

Flip2
Silver member
Silver member
i saw something online that said in theory a small amount of time wouldn't do damage(car engine) but although they didn't recommend it and I also asked someone( not that they are Bmw bike mechanics) who is familiar with engines . what damage might happen if run for that amount of time , ?

my bike never started (which sounds might be a good thing) but curious why it didn't ?


    

92KK 84WW Olaf

avatar
Life time member
Life time member
Just firing up and killing it immediately won't be a problem, but perhaps the temperature sensor without water was reading as an overheat situation which will then prevent start up.


__________________________________________________
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
    

Flip2

Flip2
Silver member
Silver member
Ok that's a relief thanks , I guess I'll have to reassemble the cooling system first

    

Laitch

Laitch
Life time member
Life time member
Flip2 wrote:i saw something online that said in theory a small amount of time wouldn't do damage(car engine). . .
my bike never started (which sounds might be a good thing) but curious why it didn't ?
The more I think about this, the more I'm convinced you should do it and let us know the outcome. There's always the risk that you'll cook the engine and be without a ride until you get a replacement, but that's the price of experimentation. It's not nearly the risk that adventurers like Alan Shepard, Ernest Shackleton, and Larry Walters undertook.

As far as the engine's not starting, that likely to be the result of your having components in various stages of disassembly.


__________________________________________________
1995 K75 90,000 miles
    

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
SniperX wrote:
duck wrote:Drain coolant.
Remove fairing lowers and radiator panel.
Remove the gas tank and unplug the fan connector under the left side of the tank.
Undo hose clamps on all hoses going into the radiator.
Remove 5mm Allen bolt that holds the top of the radiator to the frame.
Rotate the top of the radiator forward and down until it comes off of the rubbers at the bottom of it.
Remove the two screws that hold the bottom of the fan to the radiator and then pop the top of the fan off of the rubber at the top.
Wow sounds easy thanks again Duck!

Cheers!!
Pretty much like Duck says - and fairly easy to do the removal. The top allen bolt is normally hidden by the rubber mounting block at the top of the radiator, but it is easily moved aside. Those two fan mounting screws can be a sod to remove (I had to drill mine out as they were solid, even with liberal does of penetrating fluid). 

While you're in there, it's worth removing the temperature sensor and cleaning it and its electrical connections. Also take the time to clean the radiator cap to make sure it's working properly.

Reassembly of the radiator and fairings is a bit of a PITA - getting everything lined up takes a little patience.(especially getting the grommets on the front brake hose and ABS sensor wire (if you have ABS) back into the crooked slot on the radiator fairing.


__________________________________________________
Starting the fan replacement tomorrow! Any vids or primers around? Uk-log10 Starting the fan replacement tomorrow! Any vids or primers around? Sco-lo15
                              Paul  Starting the fan replacement tomorrow! Any vids or primers around? 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 82,818 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (82,684 miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine gone to Dai) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

Flip2

Flip2
Silver member
Silver member
Was thinking of wiring up my led indicator directly to to the new fan wire since I'm already splicing the old connector back to the fan , my question is the fan wire is roughly 18 awg and the led wire is 22awg is there a hazard in doing this ? shorter life to led or fire hazard? Would prefer to know when ever the fan is on.

    

92KK 84WW Olaf

avatar
Life time member
Life time member
You will hear the fan kicking in....invested in a nice new one a few months ago and it works nicely. I found riding in 35c it comes on even while riding in traffic at 20mph.


__________________________________________________
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
    

Flip2

Flip2
Silver member
Silver member
I do remember hearing the old fan cutting on before but I also wear ear plugs so a visual would be nice

    

Rick G

Rick G
admin
admin
Make sure the LED is made for 12Volts or if a 2.2 Volt LED put a 470 ohm resistor in series to stop the LED frizzleing.


__________________________________________________
"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
    

Flip2

Flip2
Silver member
Silver member
yep it's 12volt rated. just trying to follow proper wiring guidelines . thNks

    

Gaz

Gaz
Life time member
Life time member
Flip2, your LED indicator will show when there is power going to the fan but by my reckoning it will not show if the fan is actually spinning.

Just a thought.

Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

SniperX

SniperX
Silver member
Silver member
Starting the fan replacement tomorrow! Any vids or primers around? 18835684_1402216019871554_7511962397750102266_n

I have the fairing off and the tank and such but can't find that 5mil bolt someone eluded to that I need to remove to get the rad off. Any pics or can one describe it for me? BTW got the trunk mounted. Turns out it is for a K bike but the K100RT in 85 did not have provision for it other than a couple of the 4 bolt holes drilled. I was lucky enough to drill the other two in the exact spot! Trunk is a right peach! Bad pic but it's torn apart again!


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

Rick G

Rick G
admin
admin
Above the radiator and slightly to the right. They usually have a 5mm Allen head but is possible to be a 10mm hex head.


__________________________________________________
"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
    

duck

duck
Life time member
Life time member
SniperX wrote:Turns out it is for a K bike but the K100RT in 85 did not have provision for it other than a couple of the 4 bolt holes drilled. I was lucky enough to drill the other two in the exact spot! Trunk is a right peach! Bad pic but it's torn apart again!

If you had taken the tail cowl apart then you would have seen the pilot holes that are cast into all K tail cowls.

Starting the fan replacement tomorrow! Any vids or primers around? Tail_c10


__________________________________________________
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
    

SniperX

SniperX
Silver member
Silver member
RicK G wrote:Above the radiator and slightly to the right. They usually have a 5mm Allen head but is possible to be a 10mm hex head.
is it accessed from the rear of the rad or the right top side?


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

SniperX

SniperX
Silver member
Silver member
duck wrote:
SniperX wrote:Turns out it is for a K bike but the K100RT in 85 did not have provision for it other than a couple of the 4 bolt holes drilled. I was lucky enough to drill the other two in the exact spot! Trunk is a right peach! Bad pic but it's torn apart again!

If you had taken the tail cowl apart then you would have seen the pilot holes that are cast into all K tail cowls.

Starting the fan replacement tomorrow! Any vids or primers around? Tail_c10

True, but I was easily able to fugue out where they went by using a caliper and marking the holes in the frame (rear rack) and doing a little measurement. Probably saved about an hour or more. 


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

duck

duck
Life time member
Life time member
2:10


__________________________________________________
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
    

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K100-forum.com » Technical, repair and troubleshooting » Electrical » Starting the fan replacement tomorrow! Any vids or primers around?

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