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TOPIC: 1963 Johnson 28hp Seahorse not pumping water

1963 Johnson 28hp Seahorse not pumping water 1 month 3 weeks ago #145141

Hi Guys,
I'm new to classic boating and need a hand. My son and I are working on a 16' fiberglass Duo. I picked up an awesome running
1963 Johnson 28hp outboard for it. The son of the original owner said it was always a reliable and great running motor that his
dad took care of. From sitting so long he suggested it probably wouldn't hurt to put in a fresh impeller. As is, it was piddling out.
The old impeller had a couple broken fins. We installed a new one and can't get any discharge. We triple checked installation and lining everything up. i checked and blew out all passageways, no discharge. i can't believe it's anything major but I don't want to screw up this sweet old motor for my ignorance.

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1963 Johnson 28hp Seahorse not pumping water 1 month 3 weeks ago #145146

Running it in a pail? If so perhaps not in enough water. Are able to test it on the boat in a lake?

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1963 Johnson 28hp Seahorse not pumping water 1 month 3 weeks ago #145147

We've been using a trash can filled to the top. Water level is a few inches above the intake.

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1963 Johnson 28hp Seahorse not pumping water 1 month 3 weeks ago #145148

Thank you for your response. Put the lower end back together and filled the barrel up higher than usual. The motor pumps GREAT!

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1963 Johnson 28hp Seahorse not pumping water 1 month 3 weeks ago #145149

Had the same issue with my 65 33hp seahorse a few years ago...

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1963 Johnson 28hp Seahorse not pumping water 1 month 2 weeks ago #145206

The pumps are not self priming. You have to have the water line in the tank well above the pump.

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