Dear Colleagues,
My 907 started to leak coolant the other day…
Tracing back the leak I found it came from somewhere behind the radiator.
After disassembling the fairing and the radiator+fan I got to the faulty part: the aluminium tube where the 2 temperature sensors and the fan thermoswitch are placed.
In the picture you can hardly see but the green spot is the leaking point on the right side end (just where the hose connects to the tube).
Coolant leak
- Josep907
- Posts: 7
- Joined: Tue Mar 22, 2016 1:55 pm
- model: 907 I.E.
- year: 1992
- Location: Catalonia (Spain)
Coolant leak
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"I am tough but asphalt is tougher!"
Josep.
Josep.
- Josep907
- Posts: 7
- Joined: Tue Mar 22, 2016 1:55 pm
- model: 907 I.E.
- year: 1992
- Location: Catalonia (Spain)
Re: Coolant leak
Then I disassembled the tube to found a high degree of corrosion.
The SAMCO hoses and SAMCO wide clamps had done a good job holding the leak for a while until the coolant found its way.
The SAMCO hoses and SAMCO wide clamps had done a good job holding the leak for a while until the coolant found its way.
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"I am tough but asphalt is tougher!"
Josep.
Josep.
- Josep907
- Posts: 7
- Joined: Tue Mar 22, 2016 1:55 pm
- model: 907 I.E.
- year: 1992
- Location: Catalonia (Spain)
Re: Coolant leak
Both temperature sensors and thermoswitch use aluminium washer but thermoswitch additionally had a suspicious pink product that I did not expect.
Is anybody familiar with this pink substance? I wonder if this is serial Ducati fitment or an amendment to prevent something.
Is anybody familiar with this pink substance? I wonder if this is serial Ducati fitment or an amendment to prevent something.
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"I am tough but asphalt is tougher!"
Josep.
Josep.
- paso750
- paso grand pooh-bah
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Re: Coolant leak
maybe someone used sealant. Sometimes if used a very long time the coolant will leave some residue. Pink, blue, green depending on what colour the coolant has.
I`m wondering about all the black stuff on the sensors.
I`m wondering about all the black stuff on the sensors.
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- paso grand pooh-bah
- Posts: 1883
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Re: Coolant leak
the pink stuff looks like dried Loctite gasket maker. You could probly fix that hole with a bit of epoxy steel or devcon , that's if its not corroded to bad , making a new one probly wouldn't be that bigger deal
I wish I was young again............Id be heaps smarter than last time
- higgy
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Re: Coolant leak
looks like a perfect job for alumalloy
http://www.alumaloy.com/
http://www.alumaloy.com/
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- Josep907
- Posts: 7
- Joined: Tue Mar 22, 2016 1:55 pm
- model: 907 I.E.
- year: 1992
- Location: Catalonia (Spain)
Re: Coolant leak
Thanks for your words and apologize for my slow reply (I only check the forum occasionally...).
One funny thing is that corrosion built from outside to inside of the tube (starting just were the hoses ends: there some very tinny coolant leak and air's oxigen met each other).
I got a NOS tube from Stein-Dinse and reassembled the 2 sensors and thermoswitch using mid strength threadlock LOCTITE (just in case). Particularly I was concerned about large thermoswitch thread as I feared high adequate tightening torque could bend the new tube.
As for the black substance... I suspect all internal galleries are covered in this. It looks like black paint hard flakes but it is like ash: when you touch with the tip of your fingers it melts like powder.
I washed the cooling circuit three times with distilled water and refilled with MOTUL MOTOCOOL FL (red). So far it runs fine.
One funny thing is that corrosion built from outside to inside of the tube (starting just were the hoses ends: there some very tinny coolant leak and air's oxigen met each other).
I got a NOS tube from Stein-Dinse and reassembled the 2 sensors and thermoswitch using mid strength threadlock LOCTITE (just in case). Particularly I was concerned about large thermoswitch thread as I feared high adequate tightening torque could bend the new tube.
As for the black substance... I suspect all internal galleries are covered in this. It looks like black paint hard flakes but it is like ash: when you touch with the tip of your fingers it melts like powder.
I washed the cooling circuit three times with distilled water and refilled with MOTUL MOTOCOOL FL (red). So far it runs fine.
"I am tough but asphalt is tougher!"
Josep.
Josep.
Re: Coolant leak
Josep
It may be the pink is some kind of anti-seize as you say the tube is aluminum and the sensors are either steel or brass? There looks to be a crush washer for the sensors so torque value is probably low. I have had the tube out of my bike but could not break loose the sensors as I thought they were probably seized up and did not want to damage the tube.
It may be the pink is some kind of anti-seize as you say the tube is aluminum and the sensors are either steel or brass? There looks to be a crush washer for the sensors so torque value is probably low. I have had the tube out of my bike but could not break loose the sensors as I thought they were probably seized up and did not want to damage the tube.
RMR
1992 907ie
2001 900SS
2017 Supersport S
2014 BMW Sertao 650
2017 Cadillac ATS-V
1992 907ie
2001 900SS
2017 Supersport S
2014 BMW Sertao 650
2017 Cadillac ATS-V