UK Monster Owners Club Forum .: Technical :. Engines, Clutch, Gears » s4 water pump impeller??

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Old 11-02-2020, 07:58 AM   #1
jerry
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s4 water pump impeller??

the plastic impeller on the water pump looks quite pitted and worn,, but no one here knows how to get the damn thing out to replace it ,, I was going to order one when back in Uk but how do you get the damn thing out ???
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Old 11-02-2020, 11:05 AM   #2
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If it's like a 916 (would think it is?) then there is a retaining circlip on the shaft behind the bearing - you need the left side cover off to get at it.

Would advise to replace bearings/seals whilst in there.
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Old 11-02-2020, 11:36 AM   #3
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Have you seen how much they are Jerry?
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Old 11-02-2020, 08:54 PM   #4
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Quote:
Originally Posted by Darren69 View Post
Have you seen how much they are Jerry?
no are they expensive ? ,, but to get the circlip out has defeated me and the local amchine shop i might bring case to UK ,, the bearings seem ok ish but the impellor looks pitted although all the blades are in good shape

will post a photo tommorow
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Old 11-02-2020, 10:01 PM   #5
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Quote:
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...but the impellor looks pitted...
Cavitation perhaps?
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Old 12-02-2020, 09:07 AM   #6
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https://www.ebay.co.uk/itm/Ducati-Mo...kAAOSwSutaMP3Z
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Old 12-02-2020, 09:55 AM   #7
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thats a total ripoff,, cant afford that must be an alrenative
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Old 12-02-2020, 10:34 AM   #8
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I thought it was a misprint but Stein Dinse list price is 145.19 euros thats without postage and VAT.

Part number 25120026B Ducati Water pump gear 996
Ducati Wasserpumpenrad 996
Substitute for: 25120014B

That other part number is the old one and was 204 euro.
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Old 12-02-2020, 06:23 PM   #9
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I assume that it's cast? I wonder if you could get the fins milled off to leave a flat surface and then fit a SLM or DMSL 3D printed replacement blade set? Probably not cost effective unless you have an impossible to get part.

The pitting I've come across was a water pump on an enduro bike. I figured a bit of it was the alloy the blades were made of had corroded which makes me think that it was the anti freeze component. Cavitation is maybe possible but the blades operate in a closed chamber which means when the pump spins up the pressure in the pump rises which would tend to suppress cavitation.
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Old 12-02-2020, 06:57 PM   #10
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Looks extortionately expensive for an impellor.
If it's running ok and it's only the pitting that seems to be the problem, could you try coating it with some sort of resin or sealer, something similar to the type recommended for the petrol tank repair in the recent thread? Just a thought.

Crazy prices for replacement bits for our bikes. Would be interesting to see how much it would cost to build a complete monster (any model) from replacement bits. I'd imagine it'd be into many tens of thousands of ús.
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Old 13-02-2020, 02:43 AM   #11
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its made of some kind of plastic probably ABS The bearing is a little suspect too and I dont know about the seal,, It impossible to get the circlip out ,,its recessed but no room to get pick or any tool in ??

im not well might have Corona virus so I cant do much
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Old 13-02-2020, 06:35 PM   #12
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Yea way overpriced, but what caused the plastic to become pitted I wonder?
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