Topic: 1948 Sportwin gas tank – what is it? – Antique Outboard Motor Club,Inc

This topic has 8 replies, 4 voices, and was last updated 3 years, 7 months ago by lindy46.

Viewing 9 posts - 1 through 9 (of 9 total)

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June 20, 2022 at 1:24 pm #261717
lindy46
Participant
What is this hole in the bottom of my Sportwin gas tank? Pour gas in and it runs right out.
June 20, 2022 at 4:17 pm #261726
lindy46
Participant
Figured it out. Rubber expansion bulb inside. I put acetone in the tank to dissolve some old dry varnish and, you guessed it – it dissolved the expansion bulb!
June 20, 2022 at 6:33 pm #261738
Buccaneer
Participant
US Member
My uncle gave me one of these motors years ago, and said it run good,
before his son took it to school for small engine class, lost the piston rings,
etc. I finally found new rings, went all through it, but never got it running
right. The flywheel wobbled, shaking the motor, making me think my cousin bent the crankshaft
some how!

The motor was “over designed”, or perhaps too futuristic for it’s time.

Prepare to be boarded!
June 20, 2022 at 11:09 pm #261753
Mumbles
Participant
If you remove all of the Phillips screws on the bottom and split the tank, you can clean the tank and patch that hole at the same time. The gas cap has probably shrunk quite a bit and will leak any excess pressure buildup. I think this is a Sportsman tank in the photo but you get the idea.
June 21, 2022 at 10:48 am #261771
lindy46
Participant
I found a metal plug which fits perfectly. What’s the best way to seal it? Silicone? Epoxy? JB Weld?
June 21, 2022 at 2:47 pm #261789
Mumbles
Participant
If the plug is a snug fit, JB might work but I’d prefer to use a Belzona epoxy.
June 22, 2022 at 10:55 am #261802
lindy46
Participant
Very snug fit. I had some JB Weld on hand so I tried it. I’ll let it cure a few days and see what happens.
June 22, 2022 at 11:58 am #261807
joecb
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US MEMBER PAY BY CHECK
My experience with any of the epoxy and silicone sealers is that long term exposure to gasoline will cause them to deteriorate. Short term they are OK. So with our motors, typically we fuel them , run them for a day or so then drain the fuel, epoxy should be good. Some guys swear by “Seal- all ” for gasoline.

simple to test… put test sample in a jar of gasoline and check it after a few days.

Joe B
June 22, 2022 at 1:35 pm #261812
lindy46
Participant
A couple more pics, one of the tank and one of the magneto. I was surprised to find good coils and suspect they are not original. Points look good and are set to .018-.020 inches. I cleaned them and will try firing her up if my tank seal job works.
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