Coolant overflow (V4R-23)

I drop the bike AD, and problem was ( as many says here)… waterpump…..they order new one, and I hope to get bike back next week….
They said, Ducati make 7 x updates that pump, and I have latest version…still some problemos..Hope it working now.

Sutki said:

I drop the bike AD, and problem was ( as many says here)… waterpump…..they order new one, and I hope to get bike back next week….
They said, Ducati make 7 x updates that pump, and I have latest version…still some problemos..Hope it working now.

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Ooof. That sucks.

How hot does your bike get at the track? I.e. do you ever see 4+ bars on the temp display?

Don’t worry. Someone here who’s an expert will post exactly what Ducati needs to do to fix the water pump issues.

Add my bike to the list. Twice puked some coolant today. Probably 1/4 cup coolant each time. I think it’s happening when you don’t get a good cool down lap. I can see the overflow tank boiling when it happens so I don’t think it’s the pump. It’s all coming out of the coolant overflow tube. Resorted to coming in 5 min early to do an easy lap. I also made a spray bottle to soak the water and oil rads to drop temps as fast as possible. So far so good

@Sutki has it happened to you since changing the water pump?

SuperDomestique said:

Add my bike to the list. Twice puked some coolant today. Probably 1/4 cup coolant each time. I think it’s happening when you don’t get a good cool down lap. I can see the overflow tank boiling when it happens so I don’t think it’s the pump. It’s all coming out of the coolant overflow tube. Resorted to coming in 5 min early to do an easy lap. I also made a spray bottle to soak the water and oil rads to drop temps as fast as possible. So far so good

@Sutki has it happened to you since changing the water pump?

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No, everything is fine for cooling, but now is leaking oil. They didnt do very good job for sealing that motor after replacing waterpump…

Crazy to see the comments on this video. Seems like if you track your V4, you’ll eventually run into this coolant leak issue

bp_SFV4 said:

Don’t worry. Someone here who’s an expert will post exactly what Ducati needs to do to fix the water pump issues.

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The fix for the pump is obvious.

SuperDomestique said:

Add my bike to the list. Twice puked some coolant today. Probably 1/4 cup coolant each time. I think it’s happening when you don’t get a good cool down lap. I can see the overflow tank boiling when it happens so I don’t think it’s the pump. It’s all coming out of the coolant overflow tube. Resorted to coming in 5 min early to do an easy lap. I also made a spray bottle to soak the water and oil rads to drop temps as fast as possible. So far so good

@Sutki has it happened to you since changing the water pump?

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SD what are you using for coolant?

baggerman said:

SD what are you using for coolant?

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Stock. Bike should be able to do slow laps without overheating w stock cooling system

SuperDomestique said:

Stock. Bike should be able to do slow laps without overheating w stock cooling system

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Go to distilled water and waterwetter. As I've commented before I expect the pump to have been revised for the 2025 model. If they did this right you should be able to retrofit to the earlier models (new pump casting and drive gear change is what I expect). I've only found 2 revisions on the pumps, the first was a seal change to stop the pumps from putting coolant into the oil (so they only leak to the outside) and the second was the drain line for when they do leak to the outside.

baggerman said:

Go to distilled water and waterwetter. As I've commented before I expect the pump to have been revised for the 2025 model. If they did this right you should be able to retrofit to the earlier models (new pump casting and drive gear change is what I expect). I've only found 2 revisions on the pumps, the first was a seal change to stop the pumps from putting coolant into the oil (so they only leak to the outside) and the second was the drain line for when they do leak to the outside.

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Meh. Shouldn’t have a problem from the get go. Just another place where Ducati cut corners and engineered a subpar product. It may be a technologically amazing engine but if it can’t hold together then what’s the point?

This was a mistake that wasn't caught in the prototype testing probably due to them building too few for testing. Common error driven by the bean counters. The pump casting (and internals) were hard tooled. Meaning they would have to modify the tooling to actually fix the problem. Somebody made the calculation that the cost of the field failures under warranty related to this would cost less than an actual fix. The band aids that were applied didn't force a tooling change nor caused any scrap. The engineers probably devised a real fix early on but due to costs it wasn't cut in. And I expect that the engineers weren't all that happy about it (meaning if had been up to them it would have already been cut in). That why I expect the 2025 pumps to have a casting change. The material folks could get close to full useage of material of the previous design and do a clean cut-in at the model change. If they have any down rev pump material it will be consumed with by the 2025 SF's I expect and when the SF is revised it will get the new design. The delayed cut-in (year behind?) of the SF allows them to consume down rev parts and minmize scrap costs.