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Old 12-29-2018, 10:29 PM   #21
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My Jabsco 10970 once stopped pumping after an impeller change. Had me stumped for a week or so until I called Jabsco. The tech advised me to check the wear plate opposite the cover side of the impeller. I didn't even know there was a wear plate. I carefully pried it out and installed the replacement plate Jabsco sent to me for free. Worked like a champ!

He also mentioned the option of reversing the back plate to use the fresh side as the inside cover. He said the imprinted part numbers on the back wouldn't be a factor in the plate seal. I haven't tried that yet but am keeping it in mind if ever needed.
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Old 12-30-2018, 09:09 AM   #22
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Looking at a closeup of the photo, it appears the impellor isn't set in the pump cavity all the way. That, combined with wrong o-ring and it'll never prime.
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Old 12-30-2018, 02:43 PM   #23
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More great replies. I like Ski’s test method. I also need to confirm the complete pump wasn’t removed and the installed correctly. Will look into o ring size and rear plate as well. Update soon-
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Old 12-30-2018, 02:55 PM   #24
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The photo in this link may help: https://www.northern-lights.com/m673l3-65-kw/

Based upon what I see in the link (I should have checked this before commenting) and in your photos it is mounted properly but still worth double checking its rotation just in case. Seems like you have plenty ammo to troubleshoot with now...
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Old 12-30-2018, 05:36 PM   #25
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Maybe sucking air somewhere. I had a similar problem . With the advice of a fellow TF member I swabbed heavy wheel bearing grease on every possible place it could be sucking air prior to the pump. I found my air leak , it was the cap at the top of the strainer.The oring was hard so I replaced it.
If a connection is sucking air it will suck the grease in and seal .
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Old 12-30-2018, 05:44 PM   #26
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FYI, there are boxes of 400+ O rings in a vast range of sizes to be found on Ebay. I splurged $18.50 for the allegedly oil/fuel resistant version. No excuse for not having the right size at hand.
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Old 12-30-2018, 08:13 PM   #27
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I hope they came in more than one box.
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Old 12-30-2018, 08:26 PM   #28
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Quote:
Originally Posted by diver dave View Post
I hope they came in more than one box.
In one oblong purpose designed hard plastic box. Sizes from tiny to 53mm, I was after the 10 deck fill size O rings, but some of the rest some will be handy.
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Old 12-30-2018, 08:57 PM   #29
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a defective impeller, wrong o'ring, you expected it to pump?
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Old 01-03-2019, 12:15 AM   #30
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Thanks all for the support.
Dock neighbor updated me and it’s “fixed”. The solution was reported to be a check valve installed past the pump. (This hose initially had an anti siphon loop).
I know.
This leaves many unanswered questions for me. But he is understandably proud of his results-
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Old 01-03-2019, 03:20 PM   #31
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