Leaking Oberdorfer water pump - SailNet Community
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post #1 of 22 Old 04-28-2017 Thread Starter
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Leaking Oberdorfer water pump

I have an Oberdorfer water pump (202M 07 model). I need to remove it to replace the impeller as I have a V-Drive and the pump is way up under the cockpit floor. Anyway, yesterday when I did this I noticed some rust on an engine part under the pump and after replacing the pump noticed a steady drip coming from the pump hard to tell from where.

So where might the leak be on the pump and what do I need to do to (a) find the leak and (b) repair it?

Could it be dripping at the Grease cup? I can clearly see the hose connections and the leak is not from those. And it does not look like it is leaking from the front plate cover. The water is dripping off the bottom of the main pump body.

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post #2 of 22 Old 04-28-2017
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Re: Leaking Oberdorfer water pump

Look for a teeny weep hole at the area of where the pump body casting encases the input shaft .... if there's any sign of rust or water in this weep hole .... you need to rebuild the pump to replace the seals / bearings and to make sure the input shaft isn't 'scored'/damaged.

Oberdorfer pumps, especially when rebuilding, require some quite precise 'gaps' (precision spacing) between the seals and the bearings .... especially on Oberdorfer-type (knock off/imitation) pumps on many Japanese made engines. These 'as assembled' gaps allow a calculated volume/amount of water between the spaces to provide proper 'cooling' of the seals and the shafting in the area of the seal.
Most Japanese (licensed) versions of the Oberdorfers will have these specified 'clearances' listed in their 'mechanics shop manuals'. One sets-up these spec. clearances with wire-type 'feeler gages', etc. when press-fitting the seals and bearings during their installation.
If you don't have a shop manual simply use a 'wire type' feeler gage and measure for any 'gap' before your disassembly ... and return to the correct 'gap' when you reassemble with new parts.
For actual Oberdorfer made pumps, go to the Oberdorfer website, choose the correct P/N of the pump and look up in their database for the correct 'gap' (if any).

FWIW - if your engine is Japanese made and its over about 15-17 years of age, a high probability is that the pump has become functionally obsolete ... and a new pump will be costing about $400+. Re-sealing and bearing replacement is sooooo much cheaper.
If you have the 'gap' specifications and don't have the expertise of setting up 'gaps' when press-fitting the replacement parts, any 'automotive' machine shop (every large town has one) is probably the best and most economical place to press-in the seals and bearings - about a 20-30 minute job and probably at less cost than you buying yourself a proper set of 'wire-type feeler gages'.
;-)
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Last edited by RichH; 04-28-2017 at 10:02 AM.
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post #3 of 22 Old 04-28-2017 Thread Starter
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Re: Leaking Oberdorfer water pump

Ah. OK. I'll take it off and look for signs of rust. I don't have the tools or knowledge to re-build it myself. But it was rebuilt in 2011 I'm pretty sure. So I'm surprised that it might need that done again.

The pump is attached in an Universal M50 and original - probably 1983.

Thanks for the great reply - much appreciated.
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Re: Leaking Oberdorfer water pump

Don't waste your time rebuilding it. Buy a Moyer Marine MM502 pump.

-Bolt-on replacement.
-Packless bearings eliminate the need for greasing. No grease cup.
-Knurled screws for quick impeller replacement.
-Rubber O-ring replaces old paper gasket on back plate.
-No snap-ring to bother with when replacing the impeller.

Moyer Marine Atomic 4 Engine Rebuilding and Parts
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Re: Leaking Oberdorfer water pump

ummmm ..... He's got a Pearson 367 Cutter rig which originally had either a Westerbeke W40 (40 hp) or Universal 5444 (44 hp) diesel (both now 'obsolete').
The Oberdorfer or licensed Oberdorfer-type is probably the most common marine engine water pump used ... and each engine mfg/mod. (can) uses a different variation.
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Re: Leaking Oberdorfer water pump

Yup - still have the M50 5444.
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Re: Leaking Oberdorfer water pump

He said an M202 07. That's exactly the pump used on later Atomic-4's and Universal M25's and M30's if a Sherwood pump wasn't used. The MM502 is a direct after-market replacement.

It would be simple enough to remove your pump and compare it to the photo. Moyer Marine is also extremely supportive and would gladly tell you if there is a reason why it wouldn't fit.
Not only that, I'm sure they'd allow you to return it for a refund if it didn't fit.
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Re: Leaking Oberdorfer water pump

Downwind marine, new oberdofer pump m202 07 $226 just bough one a while back Oberdorfer Model 202M Rubber Impeller Pumps - Universal Engines - Engine Driven Pumps - Pumps - Downwind Marine
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post #9 of 22 Old 04-28-2017 Thread Starter
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Re: Leaking Oberdorfer water pump

My Oberdorfer 202M 07 does look like the MM502 pump. Still trying to decide if I should rebuild or replace.
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Re: Leaking Oberdorfer water pump

I would replace rebuilding never seems to last as long
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