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Old 13-Jan-2009, 05:03 PM
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keith888 keith888 is offline
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Cooling system leaks

I was losing a small amount of coolant from the 888 at the DSC trackday and occasionally on hot days (ie about once last year). I've finally got around to having a good look and I don't seem to be overheating as there is no sign of it blowing out the expansion tank. Its difficult to see for certain but I do have signs of a bit of seepage past a couple of clips on the water hoses and a clear drip from the bleed screw on the vertical cylinder (which is certainly tight).

To play safe, I've got a set of Samco hoses and clips on order (Racebikebitz.com are still giving a 10% discount and free SS clips to DSC members). I also want to add a radiator sealant while I am at it so can anyone recommend something for Ducati engines?

Thanks,

Keith
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Old 13-Jan-2009, 05:14 PM
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DSC Member nelly nelly is offline
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Personally, i don't like the sealants Keith. there's lots of small water passages that can block and the mechanical seal on the back of the pump impellor could be compromised.....
A safer bet would be to have the system pressure checked, either in situ or have the rad checked off the bike.
The expansion tanks can cause problems. They are getting old now and the plastic can harden and crack. Can be quite obscure when cold but opens up when hot and under pressure.
On the bleed screw, try a new copper washer and/or a dap of sealant on the threads.


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Old 13-Jan-2009, 06:34 PM
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keith888 keith888 is offline
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Thanks Neil. I assumed that the bleed screw would have a copper washer of some sort that could do with a change. I'm pretty sure the tank and rad are OK as there were no incriminating dried blobs of antifreeze around them. Based on the deposits the bleed screw or leaking hoses/clips look most likely. Radiator sealants always seem to provoke controversy even though many manufacturers use them from new! I take your point about the small coolant passages though so I'll try without and see now I get on.

Keith
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Old 17-Jan-2009, 12:04 AM
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phil911 phil911 is offline
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Keith,

Avoid to fill up the tank above the MINIMA line.
Don't be scared to fill it 1 cm. below the line !!!
Check if the tank cap isn't obstructed . There's a hole on top for air pressure !!!
Check the rad cap as well, the internal spring must be free ...

Regarding the tank cracks, they often are located around the single nut incorporated into the plastic ...

Phil911
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Old 17-Jan-2009, 11:57 PM
Douglas851 Douglas851 is offline
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I have never put any water in the white plastic tank, and water has never appeared in it. The rad is always full when checked. This applies to two 851/888s i have owned over a number of years and many thousands of miles and several track days.
The rad cap seals the rad, so I cannot see what the tank is for except to catch any overflow.
Am I missing something?

Douglas
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Old 18-Jan-2009, 12:18 PM
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phil911 phil911 is offline
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First few minutes after have started the engine, the thermostat is still close and about half of the coolant quantity becomes warm, reason why the rad coolant level is full.
Next step after few minutes when the thermostat is open, the coolant circulates all around the engine and the coolant level is going down.
In order to avoid a too high coolant temperature and air entries into the circuit through the tank, (air entries supposed to create knockings !!), it's necessary to fill in the tank to compensate for coolant variation ...

I wouldn't take the risk to disregard this detail ...
Our babes are considered as "oldies" now, let's pay attention to the smallest detail !!!

Phil911
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