Water pump replacement

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Spud312r said:
Can someone explain what increasing the Pumps shaft diameter has anything to do with the radiator water pressure and weak pump seals ??


I have had 3 water pumps go on my 2018 V4s track bike and was told my 4th pump was rev 7 !!!
I also never had any high temperature signs, as the dash stayed in its normal zone

Obviously I sold the bike in 2023 after that 4th pump was installed as I had no confidence in the engine and didn't want to get fluid on my back wheel, I was looking at the new model but Ducati wouldn't tell me what was causing the pump to fail....

I do like the temporary fix of adding fluid pipes to the output of the pumps scavenge ports - saves crashing for sure, but still only a plaster on the problem

Even with the 2025 model, the engine is basically the same, what makes you think they have changed the pump design ?!?!?!?!
Click to expand...
The seal thing is a bit hard to explain. As the shaft diameter is increased the seal face loading can be kept the same as the seal is being made thicker and more robust and more resistant to being overwhelmed by excess pressure. I don't think there was seven water pump revs. Less water pump revs than oil pump revs (4?) I think. I did read a press release about the entire cooling system (water and oil) being revised on the 25's. When the 2025 parts PDF's show up I expect we'll see another pump rev.
 
My dealer replaced the water pump on my 22 sf v4s under warranty but didn't change the oil☝️- is this ok?
 
I certainly asked for an oil change at my expense after that - just wondering if that's technically part of the replacement process?
as I can see in shade's guide
shade said:
First is to drain the oil and coolant.
Click to expand...
 
My 2020 has pretty low miles, just a shade over 2,000. Most of them track. When ordering a new pump for a pre-emptive replacement how do I know I'm getting the latest revision part? Does anybody have the part number handy?
 
theclaw said:
My 2020 has pretty low miles, just a shade over 2,000. Most of them track. When ordering a new pump for a pre-emptive replacement how do I know I'm getting the latest revision part? Does anybody have the part number handy?
Click to expand...
ducati omaha...oem part finder....click on 2024, find the part in the pdf....then cross check part number with 2020

then report back haha...i have a 2020 and i may do same preemptive work

jag
 
If you're handy enough to separate the driving gear and circlip from the water pump and want to save a few dollars, the pump part number itself is 2I24920511K

If you want a new driving gear and fully assembled unit that you only have to bolt on, the pn is 24920612A

I wouldn't recommend trying to replace the seals on the engine cover side. It can be done but they're press fit, the magnesium is easy to mar

Cross country Ducati
 
SirJAG said:
ducati omaha...oem part finder....click on 2024, find the part in the pdf....then cross check part number with 2020

then report back haha...i have a 2020 and i may do same preemptive work

jag
Click to expand...

2020 Part number, 24920512F

2024 Part number, 24920511F

Astral11 said:
If you're handy enough to separate the driving gear and circlip from the water pump and want to save a few dollars, the pump part number itself is 2I24920511K

If you want a new driving gear and fully assembled unit that you only have to bolt on, the pn is 24920612A

I wouldn't recommend trying to replace the seals on the engine cover side. It can be done but they're press fit, the magnesium is easy to mar

Cross country Ducati
Click to expand...

Which seals are you refering to? The pump itself is $426 and the entire assembly (24920612A) is $907 which includes about $300 to assemble all seven parts. I don't see any engine seals in this parts diagram.

Screenshot 2025-02-14 072501.jpg
 
See 24 - the clutch cover slides over a bushing on the water pump side that keeps the impeller/rotating gear in place to mitigate the gyroscopic movement. You'll notice it has to be aligned when putting the clutch cover back on. The aligment pins on the cover help, but it wont sit flush without sitting inside the #24 seal. #27 is the seal for the oil pump, which I replaced since I was already in there. There's 2 tools (#7 - one to loosen and one to tighten) from Ducati you'll need to prevent the engine gear, that contacts the water pump drive gear, from rotating and not applying the torque needed to loosen/tighten against the gears. The pump is bolted onto the engine case but the drive gear is seperate.
1000005524.jpg

1000005525.jpg

1000005526.jpg


I swapped the water pump at the same time during a shift linkage upgrade, few photos of the pump and internals
 
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$900 for a fully assembled unit and labor is ridiculous imo - the impeller/gear is somewhat easy to seperate from the pump so I decided to rebuild the cover where I could and keep the same impeller/drive gear
 
I didn't get a photo with the tools installed, but they sit in the gear cog. In short it prevents the gears from pushing against each other during tightening/loosening, and they also make sure the cogs are properly aligned when setting the assembled water pump back in place. Another thing to look for on the dry clutch is the main oil seal, ensure the small spring stays on it as it goes back over the clutch hub (where the clutch basket bolt holes are at)

1000005527.jpg
 
#36 - there's a whole process to seating it properly on a new seal. If you reuse the old one, open it slightly to get it around the hub and then install the clutch bowl (35) over it. As long as the spring stays on the inside and tighten it correctly you should be good

1000005528.jpg
 
theclaw said:
My 2020 has pretty low miles, just a shade over 2,000. Most of them track. When ordering a new pump for a pre-emptive replacement how do I know I'm getting the latest revision part? Does anybody have the part number handy?
Click to expand...
I would wait until the 2025 parts catalogues are up and see if they rev'ed again.
 
SuperDomestique said:
Amazing that they’ve been out for 2-3 months and the parts fiches are still not posted to the public…
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Yeah I haven't ordered any of the parts for the motor on the bench because I'm waiting to see the if they revised the water pump yet again. They said they went to the R oil pump for all desmo V4's but is that the 24 R pump or did they rev the oil pump again for 25. Hopefully we'll see it out soon. Then I'll have to wait a month for the really overpriced parts ($240 for an exhaust valve so I bought a head off fleabay for $250 that has nice ones.). Rings, bearings, seals, head gaskets you're closing on $2K. Oil pumps are about $700 etc. Parts cost and lack of aftermarket support of any kind (no aftermarket shim kits even, ducati's getting about $20 a shim) is why nobody wants to blueprint these. If I were going to race one of these, I'd buy a nice low mileage spare before the V4's start getting more mileage on them and decent spare motors get pricey.
 

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