Trying to find a replacement M25 Oberdorfer raw water pump..help! [Solved]

[1911tex]

Folks I am trying to find a replacement raw water pump for my Universal M25, 5421. If anyone out there has a model number, please advise. This unit on my engine works fine, but I want a correct fitting Oberdorfer or Westerbeke for a backup to this old pump that has been sealed to keep from leaking..pretty obvious! Does not leak but is ill fitting. Can anyone help? Photo below and answer from one source. I also sent a photo and request and no answer yet to: www.westerbeke.com.

Larry Butchart (Fisheries Supply Support Desk)
Mar 17, 11:52 AM PDT

Sorry, we can't tell you which is right for your application.
Larry Butchart
Customer Service
206-634-4603
lbutchart@fisheriessupply.com

 

[Alan Gomes]

Folks I am trying to find a replacement raw water pump for my Universal M25, 5421. If anyone out there has a model number, please advise. This unit on my engine works fine, but I want a correct fitting Oberdorfer or Westerbeke for a backup to this old pump that has been sealed to keep from leaking..pretty obvious! Does not leak but is ill fitting. Can anyone help? Photo below and answer from one source. I also sent a photo and request and no answer yet to: www.westerbeke.com.

Larry Butchart (Fisheries Supply Support Desk)
Mar 17, 11:52 AM PDT

Sorry, we can't tell you which is right for your application.
Larry Butchart
Customer Service
206-634-4603
lbutchart@fisheriessupply.com

Give Depco Pump a call. It *might* be the Oberdorfer pump shown on p. 138 of their catalog. They are a great source of info in any case.

 

[1911tex]

Thanks Alan, will do mañana ! And thanks!

 

[1911tex]

Just received this reply:

Thank you for your inquiry.
Part number 301357 PUMP, SEA WATER is in stock and has a list price of $522.00.
There is also a kit for that pump PN 200212 – this is not currently in stock and has a list price of $354.20 and approx. 14-21 day lead time.
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Parts can be ordered through your Local Westerbeke Distributor/Dealer or our website www.westerbeke.com

Your email does not indicate your location however, you can locate your local distributor or dealer via clicking Locate Distributor https://www.westerbeke.com/distributorlocator.htm found at the top of any Westerbeke.com page along the blue line.

Thanks again for your inquiry. We appreciate your business!

Sincerely,

Westerbeke Corporation
150 John Hancock Road
Taunton, MA 02780
Phone: 508.823.7677
Fax: 508.977.4330
www.westerbeke.com

Important Note: Technical information is provided for your reference and convenience. Westerbeke recommends that your engine, generator, or climate control system is serviced and/or installed only by an authorized Westerbeke distributor or dealer.

 

[GrandpaSteve]

This is the one I used, works great - https://www.pumpsandpartsonline.com.../rubber-impeller/rubberimpellerpumps/N202M-16

I ordered the engine-side paper gasket from Catalina direct.

 

[tenders]

Is this the same Oberdorfer pump as used by the good ol' Universal Atomic Four? If so, Don Moyer has a new-and-improved version with better bearings and seals. He has two pumps on this page, one for the original raw-water side of the engine and another for the raw-water side of an engine that's been converted to freshwater cooling. I have owned the first one for several years and it has been trouble-free.

They replace Oberdorfer models N202m-07 and N202m-03.

Pumps & Parts – moyermarine

moyermarine.com

MMI flange pump – moyermarine

moyermarine.com

Sea water pump – MMI 501 pedestal pump – moyermarine

moyermarine.com

Don further mentions: "NOTE: For Universal diesel owners, if you you’re currently using an Oberdorfer 202M-3 or 202M-7 pump, or the newest version of these pumps with an “N” prefix, your engine will already have the necessary adapting hardware that is required to convert to our MMI 502 Flange Pump. If you’re currently using a pump with four bolts in its mounting flange, you will need one of our adaptor plates and a shaft adaptor to convert to an MMI 502 Flange Pump (see product numbers DIES_01_560 and DIES_02_561.)"

 

[1911tex]

Thank you GrandpaSteve!

 

[1911tex]

Thanks Tenders....gotta think this one through! I guess I am totally confused.

 

[Navman]

If no success, try Hansen Marine. They are soooo good with universals.

 

[Christian Williams]

For what it's worth in real world terms I've replaced two pumps and ran into zero complications. Sometimes photos help clarify.



This was an old Sherwood. It was held onto the face of the M25 by clumsy brackets and only two bolts. It faced backwards, and looked jury rigged.

This is the face of the M25 block, with its four threaded holes.



This is an Oberdorfer replacement. I think I bought it from Catalina Direct and it was the only one they recommended for the M25.



At least the original Sherwood required a slotted spacer to meet the axle by which the engine turns the pump. If you put it in wrong, the slots didn;t engage and the impeller didn't spin and no water came out the exhaust. So I would pull the pump, fiddle with it, and reinsert.



The Oberdorfer pump on the current boat went right on and needs no spacer.

Some models have an O-ring, some have paper gaskets, and my Sherwood was sealed only with gasket goo. I'd say that if the thing doesn't leak, good enough.

 

[1911tex]

Christian...just what I have been looking for! I can't read the Oberdorfer model number...too blurry...can you clarify?? And a big thank you!

 

[Christian Williams]

N202M16

Water Pump Replacement or Retrofit, 1/2" Oberdorfer

Catalina Direct, publishers of the Catalina 22 and Catalina 25 Owner's Handbooks and the largest supplier of parts and Lewmar winches for Catalina Yachts in the country

www.catalinadirect.com

 

[1911tex]

Christian I hope you get paid big bucks for your unlimited Ericson knowledge ! Thank you!

 

[Rocinante33]

N202M16

Water Pump Replacement or Retrofit, 1/2" Oberdorfer

Catalina Direct, publishers of the Catalina 22 and Catalina 25 Owner's Handbooks and the largest supplier of parts and Lewmar winches for Catalina Yachts in the country

www.catalinadirect.com

Here is another one for price comparison. Moyer seems to be a bit more money but it may be worth it for the thumb screw removable cover. See Christian’s reference to the proper model #

Departments - Oberdorfer Model 202M Rubber Impeller Pumps - Universal Engines | San Diego Marine Exchange

store.sandiegomarine.com

 

[1911tex]

So many of you recommended the N202-M16 so that is the direction I went...Thank everyone of you so very much!! Stay healthy! Stay out on the water so you can eliminate the crowds!!!!

 

[turkey11]

Folks I am trying to find a replacement raw water pump for my Universal M25, 5421. If anyone out there has a model number, please advise. This unit on my engine works fine, but I want a correct fitting Oberdorfer or Westerbeke for a backup to this old pump that has been sealed to keep from leaking..pretty obvious! Does not leak but is ill fitting. Can anyone help? Photo below and answer from one source. I also sent a photo and request and no answer yet to: www.westerbeke.com.

Larry Butchart (Fisheries Supply Support Desk)
Mar 17, 11:52 AM PDT

Sorry, we can't tell you which is right for your application.
Larry Butchart
Customer Service
206-634-4603
lbutchart@fisheriessupply.com

Hi Tex, after a lot of searching, I found someone, you, who has my same setup. I have confirmed they do not sell a pump with the two holes needed to fit over the studs on your adapter plate. Mine is fused with the block now and would not budge. I got a pump, but did you end up having to drill your own holes? I think I can do it right, if I screw it up, that is 380 bucks down the drain.