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  #1   IP: 23.115.191.11
Old 07-27-2022, 09:39 PM
Golfdad75 Golfdad75 is online now
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Obendorfer pump

Are all Obendorfer pump model 202m7. The only number I can find on my pump is 8595. Is there any trick to rebuilding it.?
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Old 07-28-2022, 09:43 AM
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Depending on cavity wear, it may not be rebuildable. Sure, bearings, seals and shaft are all replaceable but if the cavity in which the impeller spins is worn to a point where there is no longer a good seal on the edges of the impeller vanes, the time has come for complete pump replacement.
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Golfdad75 (07-29-2022)
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Old 07-28-2022, 12:26 PM
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How would I know

Is there anything to tell me that
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Old 07-28-2022, 01:27 PM
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The biggest issue is it won't prime/pump anymore. If you need to replace, I highly recommend the Moyer 502 pump..it moves way more water than my 202m3 did.

Throw up a picture, someone here can probably identify it. The difference between the 202m3 and 202m7 I believe is the size of the "shoe" in the cavity..the 7 has a bigger shoe and in theory pumps more water. Also check the inside of the plate...that should be smooth, and a worn pump will have noticeable wear from the impeller.
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Last edited by sastanley; 07-28-2022 at 01:30 PM.
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Golfdad75 (07-29-2022)
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Old 07-28-2022, 07:39 PM
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I took the pump to a marine pump guy and he said to just replace the seals. He also told me that I probably was my own worst enemy, I put too much grease in. He told me 1/2 pump every 6 months with a 10 oz gun. I blew the seals out.
In the last 10 days I have put in a new rwc impeller, rebuilt the starter, new solenoid, new hoses to the rwc, cleaned the strainer and dropped the carburetor and cleaned it. Now new impeller and seals in the fwc. I am hoping for a respite. But I have to admit it has been pretty reliable until now.
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Old 07-28-2022, 07:55 PM
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Those old Oberdorfer 202 pumps DO wear out. I fought with one for years - new shaft, new seals, etc. I figure time working on the pump is time I could spend sailing. Get the new Moyer pump and enjoy your life.
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  #7   IP: 104.174.83.118
Old 07-31-2022, 05:54 PM
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Quote:
Originally Posted by Golfdad75 View Post
Is there anything to tell me that
Using a dial caliper measure the width of the impeller and the depth of the pump cavity. Subtract the latter from the former. If the answer is negative the pump is done.
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1977 Catalina 30
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  #8   IP: 23.115.191.11
Old 08-01-2022, 12:01 PM
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Thanks one more question

Thanks for that information. After replacing the seals it runs about 130. Previously it ran at 160. If I use a infra red engine thermometer do I shoot willy nilly or are there certain spots to check.
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Old 08-02-2022, 08:36 AM
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I've attached one of the worksheets we used during the testing of the Moyer Marine thermostat showing all the temperature measurement locations.
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File Type: pdf A4 temp worksheet RWC with Tstat.pdf (33.2 KB, 17 views)
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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