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Old 05-07-2017, 10:00 PM   #1
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Oberdorfer Pump Model 403M

It looks like this pump has been discontinued. It's the clamp on style . Does anybody know of a replacement pump of another brand that will work .Engine is Perkins 6.354 NA

Thanks
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Old 05-07-2017, 10:19 PM   #2
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This is the pump that is on our Perkins 6.3544M...https://www.jabscoshop.com/marine/pu...aded-ports.htm
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Old 05-07-2017, 10:24 PM   #3
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Give George Hecht at Depco a call. The 403M still shows in their catalog.
http://online.anyflip.com/ucrc/jfuq/...dex.html#p=137

Tell George I retired and that's why I haven't bothered him in a while.
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Old 05-08-2017, 05:17 AM   #4
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Quote:
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This is the pump that is on our Perkins 6.3544M...https://www.jabscoshop.com/marine/pu...aded-ports.htm
Thanks Mike , that looks just like my pump . Jabsco may be easier to get parts for.
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Old 05-08-2017, 05:19 AM   #5
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Give George Hecht at Depco a call. The 403M still shows in their catalog.
http://online.anyflip.com/ucrc/jfuq/...dex.html#p=137

Tell George I retired and that's why I haven't bothered him in a while.
Thanks Parks , I will give him a call today . I would like to rebuild this one and maybe get a spare pump . Looks like he carries the Jabsco pump that will fit
also .
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Old 05-08-2017, 06:14 AM   #6
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Obendorfer is good equipment , should be EZ to rebuild .
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Old 05-08-2017, 05:35 PM   #7
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Replaced o ring on strainer and on pump face . So far so good .Still getting some air bubbles in strainer .
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Old 05-10-2017, 06:32 AM   #8
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."Still getting some air bubbles in strainer ."

Use your finger and shmeer heavy grease on each place the air could come from.

With patience you will find the leak.
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Old 05-11-2017, 05:36 AM   #9
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."Still getting some air bubbles in strainer ."

Use your finger and shmeer heavy grease on each place the air could come from.

With patience you will find the leak.
Just on the suction side or on every connection ? What will the heavy grease do to show me the leak ?
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Old 05-11-2017, 12:26 PM   #10
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Just on the suction side or on every connection ? What will the heavy grease do to show me the leak ?
Hi Marty, I had never heard of the grease trick until FF suggested it. It kind of makes sense. Start greasing the connections at the seacock and work your way to the strainer. When the bubbles stop you will have found the problem. The grease isn't meant as a fix, just a diagnostic tool.
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Old 05-11-2017, 01:48 PM   #11
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Hi Marty, I had never heard of the grease trick until FF suggested it. It kind of makes sense. Start greasing the connections at the seacock and work your way to the strainer. When the bubbles stop you will have found the problem. The grease isn't meant as a fix, just a diagnostic tool.
Ok that's only a couple places it could be . Thanks FF and HopCar .
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Old 05-11-2017, 07:04 PM   #12
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."Still getting some air bubbles in strainer ."

Use your finger and shmeer heavy grease on each place the air could come from.

With patience you will find the leak.
This worked quick .Thanks
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Old 05-12-2017, 05:48 AM   #13
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"This worked quick .Thanks"

Where was the air leak , how did you fix it?
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Old 05-12-2017, 07:35 AM   #14
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Looks like it's at the top of the strainer . I replaced the o ring a couple days ago but it still wasn't sealing good enough . I had to put some mojo on the cap with a hammer to get it to seal . I may not have the right seal there . Either that or the surface needs to be remachined or might need all new bronze strainer , but for now it's working. Thanks for the grease tip .
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Old 05-14-2017, 12:54 AM   #15
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Next time lightly grease the O ring itself. Maybe the sealing area of the strainer has a ding that needs to be attended to or maybe need a thicker O ring.

A good bronze strainer should last a LONG time but they were not finely machined so some times a bit if fiddling may be needed like on my old Perko. Once closed though it's closed.
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