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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > rebuilding Oberdorfer Pump
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: rebuilding Oberdorfer Pump Reply to Thread
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Topic Review (Newest First)
03-05-2013 09:30 AM
mariab
Re: rebuilding Oberdorfer Pump

Bronze is a little hard to find in 3/8" NPT, you may have to settle on brass. Not ideal, they will just have to replace the fittings more often. Plastic will break too easily.
03-05-2013 06:48 AM
pvajko
Re: rebuilding Oberdorfer Pump

Great! Thanks. I was just wondering if I need to replace the HX zinc every year, but looks like I better do.
03-04-2013 11:49 PM
eherlihy
Re: rebuilding Oberdorfer Pump

Brass is OK in this application, as it should be protected by your H/X zinc.
03-04-2013 06:33 PM
pvajko
Bronze fittings?

I'm replacing my Oberdorfer n202-15m pump and just wondering what fittings to use. I have a 3/8 NPT to 5/8 barb elbow and a straight 3/8 NPT to 5/8 barb nipple on the old one, I don't know if it is bronze or brass.

I read that brass fittings don't work well with bronze, and while buying fittings made of brass does not seem to be a problem, I'm not able to find any bronze fittings with 3/8 NPT anywhere.

Wonder what others used? Is brass ok? Plastic?
04-10-2012 11:23 PM
deniseO30
Re: rebuilding Oberdorfer Pump

The black rubber impeller primed from the bucket in about 5 seconds E. The globe impeller is about 3/64ths too thin. It's pumping like a champ again!
04-10-2012 11:17 PM
eherlihy
Re: rebuilding Oberdorfer Pump

D- Before you replace the impeller, you can coat it with dish soap and it will prime.
04-10-2012 07:31 PM
deniseO30
Re: rebuilding Oberdorfer Pump

Did a search on sailboat owners and Maine Sail's Musing, Seems the Globe impellers are a problem. So I'll order another spare from Moyer or one of the others. Defender is $37 actually more then Moyer's at $33
04-10-2012 06:22 PM
deniseO30
Re: rebuilding Oberdorfer Pump

Going to re-activate this thread!

Rebuilt my OBD pump a few years ago. "Time to change the impeller" me thinks!

Noooo Problemo! Out with the old it; was still good but lost it's "spring" and the vanes were not coming back to straight. So we put the new one in. It's a globe "run dry" I also have a OEM spare. So get all together. it won't prime. Just like 3 yrs ago when I tried the Globe impeller! ARRRG Put the good OEM impeller in.. and it pumps! go figure the globe blue run dry looks identical in every way. but it won't prime and pump.

Looks like OBD pump impellers are going for over $30 now. just amazing what things cost for "marine" applications.

How could an impeller that's identical not work? My only guess is it's too soft?

yes, have the thin OEM paper gasket, no it doesn't drip water, seals are still good.
04-02-2012 10:30 PM
Stu Jackson
Re: rebuilding Oberdorfer Pump

None taken. You nailed it, it's crud. Seemed that the pump/engine gasket might have been leaking a tad, so the engine started to go all crud-dy on me. When the OEM pump started to go back in 1998 or 9, that whole section of the engine started to get rusted out. I painted it with Rustoleum gray primer, never did get to paint it in the Universal Bronze (have a can) also understand that GM Camel (#286) also works. As you can see from other pictures in that link, it's time to paint again.

It's truly amazing how salt water can "migrate" around.

A friend wrote this on our C34 Board:

When we first posted it the #286 GM Camel paint was available at Track auto stores (1998?). When Track was bought up, I guess that the metallic copper paint went with the buyout? Just look for some metallic copper auto paint.
BTW, the front of the accessory end of the engine (Oberdoffer/Sherwood and the internal water pump is mounted to) is an aluminum alloy!! The bell housing is also an aluminum alloy. The Hurth transmission body is also an aluminum alloy. The only part of the engine that can rust is the cast iron Kubota block and the steel oil pan.!
Don't get me wrong, because aluminum alloy will corrode somewhat if salt water stays on it. I have never painted my new injectors, because salt water should never get up that high. To preclude the chipping of paint you can also get the same protection from BO Shield (waxy) spray.
04-01-2012 07:55 PM
eherlihy
Re: rebuilding Oberdorfer Pump

Stu - Not meaning any offense, but; What is that crud on your timing case cover?
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