Green light at navigation panel and Oberdorfer raw water pump

[Jim Hardesty]

Replaced the old Sherwood raw water pump with the new Oberdorfer today. Pretty straightforward swap out with the guidance provided here on the forum. Thanks all!

I suggest you rebuild the "old" Sherwood pump.  The rebuild kit wasn't much money and was easy to install. Nice to have a spare.
Jim

[Paulus]

Thanks Ron for the correction on the green light.
Paul

[Gulfsailor]

Thanks. I plan to rebuild the Sherwood using the information posted here.  Now I'm looking for the best price for the kit. Prices are all over the place....Depco vs other online sources. 

Stay Cool Pumps $92 https://staycoolpumps.com/store/p313/_Repair_Kit_For_Sherwood_Pumps_G903_,_G908.html

Marine Pump Direct $133 https://marinepumpdirect.com/sherwood-major-repair-kit-25108/?gclid=EAIaIQobChMI4a6I1PvIgwMVHU1HAR2WlADmEAQYASABEgIJBfD_BwE

[Ron Hill]

Rick : I wrote a detailed article on rebuilding Sherwood Pumps (Mainsheet tech notes).  Make sure that you use a stainless "C" clip, because the copper/bronze "C" clip will be eaten alive by salt water!!  I note that in my article!!

A few thoughts

[Gulfsailor]

Thanks Ron.  I read your article and it will provide a good roadmap to follow.

[KWKloeber]

Here is the image....I think.

I don't know which pump model you installed BUT here's the facts for anyone else who wants to make the switch


The older engine models (m-25, XP, 35, etc) that are NOT "B" model engines, the Ob pump is the N202M-16, "square" mounting flange.  If your Sw pump was a bolt-on (like the way older bolt-on Sw pumps) it will be a direct replacement.

If your Sw has a round, clip-on base you remove 6mm set screws from the TWO (unused) mounting holes on the gear cover. Install 6mm studs in the four holes in the cover and bolt up the Ob pump.
Hint: the square Kubota mounting gasket is better than the Wedterbeke one.

You can use the direct replacement N908M Ob pump BUT it's unnecessary to spend the extra cash for it.

If you have the "B" series engine the direct replacement is the N908M Ob pump.
BUT that's also an unnecessary extra cost if you are handy with a Dremel or angle grinder.   The N202M-16 pump can be reworked to be a bolt-on mount pump on the "B" engines.


(If the Sw was clip-on) once you remove the two setscrews in the gear cover and install the studs the pump land will look like the below, ready for the bolt-on N202M-16 pump.

If anyone has any oddball situation or questions just email me.