impeller replacement

[Ken Heyman]

I removed my sea water pump impeller  a few days ago. I have a sherwood pump. I compared this impeller to one that came as part of a Universal Diesel parts replacement kit for a mxp25 (contained fuel filters, oil filters belts etc.). It appears to be of a different size than the one I removed. The width and length of the blades of the replacement  are longer. Also the slot for the "key" is  wider. It will probably fit but I can't find a part number on the old impeller in order to inquire of universal. Any suggestions? I guess I could let Universal sort it out with a phone call.

Thanks  in advance,

Ken

[Tom Soko]

Ken,
It could be that the impeller in the spare parts kit is for an Oberdorfer pump.  Both  Sherwood and Oberdorfer were used on the M25XP.

[Ron Hill]

Ken : When you ordered that kit did you state that you had a Sherwood?
The Oberdofer impeller has 6 blades and as I recall a Sherwood impeller has 8 or 10 blades.  
Think that you need to call Universal/Westerbeke.  

[Ron Hill]

Ken : As mentioned your engine could have 3 different pumps Oberdofer, Sherwood or a  Johnson.  
BTW, if you look on page 34 of your owners manual you'll find that a
Sherwood impeller has 12 blades and as I said an Oberdofer has 6 blades.