Riddle me this fellas:
Oberdorfer 202M7 pump.
Engine has sat for at least 5 years, properly winterized on the hard.
I remove old impeller. It's not cracked, but is a bit deformed.
I install a new, seemingly identical impeller. The package even said "Oberdorfer" on it, and referenced the pump models it's compatible with.
With the new impeller, the pump simply cannot pull water from the seacock.
I put the old impeller back in, and "bam" pulls water and pumps like a champ.
Obviously, running with a 5 year old impeller is not acceptable. I tried lubing the new impeller, but it didn't help. The old impeller is not lubricated and still pumps fine. No, the metal hub is not torn out center of the new impeller. The old and new impellers seem identical in every measurement.
Also- What is the difference between the "N" designation and the older, 202M7 model?
Lastly, here's something that makes NO sense to me whatsoever:
When I replace an impeller on my Atomic-4, it slips easily off the shaft when I remove the cir-clip. When I needed to remove and install the impellers from this other engine, I needed to use a hammer and drift to tap the shaft through the impeller hub. That's not normal, is it?
What say the quorum?
Oberdorfer 202M7 pump.
Engine has sat for at least 5 years, properly winterized on the hard.
I remove old impeller. It's not cracked, but is a bit deformed.
I install a new, seemingly identical impeller. The package even said "Oberdorfer" on it, and referenced the pump models it's compatible with.
With the new impeller, the pump simply cannot pull water from the seacock.
I put the old impeller back in, and "bam" pulls water and pumps like a champ.
Obviously, running with a 5 year old impeller is not acceptable. I tried lubing the new impeller, but it didn't help. The old impeller is not lubricated and still pumps fine. No, the metal hub is not torn out center of the new impeller. The old and new impellers seem identical in every measurement.
Also- What is the difference between the "N" designation and the older, 202M7 model?
Lastly, here's something that makes NO sense to me whatsoever:
When I replace an impeller on my Atomic-4, it slips easily off the shaft when I remove the cir-clip. When I needed to remove and install the impellers from this other engine, I needed to use a hammer and drift to tap the shaft through the impeller hub. That's not normal, is it?
What say the quorum?
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