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Old Sep 19th 2013, 02:14 PM   #1
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Strange Coolant Leak

My bike has developed a strange problem with a coolant leak. Riding the bike normally everything is OK, but if the bike gets hot while stationary, 100C plus, it dumps some coolant a short while after the engine is stopped. The coolant is coming out of the right ride of the bike about 6 to 9 inches back from the front of the fairing. I think this is where the overflow pipe comes down from the expansion tank. Once it starts flowing, it comes out quite fast, but only for a short while.

It's been back to the dealer, who was skeptical and couldn't reproduce it so they gave bike back to me, but it did it a second time within 30 minutes of getting back from them. I'm wondering if it's not sealed properly (faulty rad cap?) and the coolant is boiling once the coolant stops circulating when the engine stops. There's no residue from any coolant anywhere round the engine.

I guess it dumps about a 1/4 pint in in the space of a minute or two after the engine is stopped, but it doesn't seem to lose any coolant while running, as far as I can tell.

Any ideas?

Last edited by PaddockStand; Sep 19th 2013 at 03:50 PM.
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Old Sep 19th 2013, 02:19 PM   #2
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I had the same issue when I first brought my bike from the dealership, turned out that the rad cap was not sealed off properly.

Leak was in the same spot. Hope that helps
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Old Sep 19th 2013, 02:43 PM   #3
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My Tri is at the dealer now for the 7,500 miles service and they found an oil leak in the gasket and the coolant leak. First time i've seen it discussed.
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Old Sep 19th 2013, 03:36 PM   #4
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There are two drain hoses for the coolant system, one is on the centreline and runs down the front of the sump between the silencers and the other is on the right side of the bike and exits about 6 inches back from the front of the faring. Anyone know which one is the radiator overflow and which is the expansion tank overflow, I can't figure it out from the workshop manual drawings.

The cooling is coming from the one on the right side if the bike:



I think a faulty rad cap is a strong contender.
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Old Sep 19th 2013, 05:54 PM   #5
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I had my hose connecting to the overflow tank become faulty. It's the one connected to the very top of the radiator. When it was still it was fine, but once it developed pressure I pushed on it and it was cracked right at the fitting.
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Old Dec 23rd 2013, 10:26 AM   #6
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Just developed this issue. Haven't had a chance to investigate cause. Any resolution on yours Paddock?
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Old Dec 23rd 2013, 11:07 AM   #7
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The system runs cooler when the bike is moving of course but while it's stopped with no air flow it gets hot quick sounds like classic air in the system to me.

1) The best way to solve it if you don't have an radiator air purge kit is to empty the overfill bottle
2) Run the engine until about 176 F
3) Wait until the engine cools down and the system get unpressurized
4) remove the radiator cap carefully
5) Add coolant to the top of the neck just below the overfill hose. (The level should go down as air is purging into the overfill bottle along with coolant.)
6) install cap
7) repeat steps 2-6 until the Radiator overfill is at the proper level.

This will take some time don't rush it this will get the air out. Your engine will run cooler with less air in the system and the air won't push the coolant out the drain hose.
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Last edited by ScrapperX; Dec 23rd 2013 at 11:13 AM.
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Old Dec 23rd 2013, 12:48 PM   #8
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Originally Posted by slnvail View Post
Just developed this issue. Haven't had a chance to investigate cause. Any resolution on yours Paddock?
Faulty rad cap. Hasn't done it again since it was replaced. This was after the third occurance and at my suggestion to the dealer who couldn't diagnose what was wrong. I then had to wait three weeks for the replacement cap to come from Italy as it was out of stock at Ducati.

I think what happens is that the faulty cap means the coolant system isn't pressurised and when you stop the bike the residual heat in the block causes the coolant, that is no longer circulating, to rapidly boil. When this happens steam pushes past the faulty rad cap into the expansion bottle causing it to overflow. If its the same problem you should see the coolant coming out of the expansion tank overflow pipe on the right side of the bike a few inches back from the front of the faring.

Get your dealer to replace the rad cap under warranty and check the coolant level. If they have difficulty getting an official cap, I think it's just a fairly standard motorcycle radiator cap you could buy elsewhere. Six weeks after it first happend I was about to do this out of desperation when the official one finally turned up. If you have to go down this route, just get the same type of cap, one with a valve for the expansion tank, and the same pressure rating. I think its stamped on the top of the cap.
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Last edited by PaddockStand; Dec 23rd 2013 at 12:50 PM.
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Old Jun 16th 2017, 06:04 PM   #9
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I know this is an old thread but I believe I'm having the same issue. Had a coolent leak in the same spot after a ride. Went for a second ride and no issues. I have a radiator cap on order from the dealer but not coming in till next week. Weather is suppose to be nice this week end and wanted to ride. My question is has anyone else had this issue and as long as the temp dosnt get hot would there be any issues.
Thanks for any input.
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Old Jun 16th 2017, 07:05 PM   #10
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Just go buy a radiator cap that is the same pressure from any auto store

Also its known that the water pump + thermostat housing is faulty and leaks coolant, if your thermostat housing is leaking when replacing request that worm type clamps are used instead of the click together clamps.
Thanks from Marmoot and PGH1199

Last edited by Halo2; Jun 16th 2017 at 08:44 PM.
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