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Anyone ever take the “two piece” Martin 20 gas tank apart?
It has machine screws around the bottom perimeter, and on the top side, inner perimeter.It’s aluminum, so no rust of course, but it was thick was old dried gas crud and a bunch of rubber stuff inside.
I’m not sure what the factory sealed the seams with, or if it was really meant to come apart again.I shook it with acetone and screws inside off and on for two days, and it was better, but not near good enough
to run the motor. My last attempt was a muriatic acid dilution, which didn’t do a whole lot other than make the
upper seam start leaking after a few minutes. The acid was reacting with something, as the tank started getting
a little warm. I thought best not to leave the acid in too long, so I washed it out with lots of water.
Prepare to be boarded!
I took mine apart and found ton of gunk inside, as you have. I can’t see a slosh sealer working with all that crud from the original seal in there.
Upon advice of another member on this forum, I resealed it with an aircraft tank sealer, figuring if it was good enough for airplanes, it must be good enough for an outboard. He was right, it worked great.I’ll have to search and find the info for the product. Be back inn a few………
Frank, I’m sure that tank sealer is great stuff, but not sure it’s going to be worth the money for
this little Martin, and I have POR15 and Kreem in my supply cabinet. I’ve used Kreem twice
now, and kind of like that.Maybe I’ll have to try harder to get the tank apart. If I continue with the torch to heat the seams
up “Ted” will go up in a puff of smoke.I checked the compression at 75 psi before I tore the motor apart, so thought I was good
to go. I was disappointed today when I could not get it to rope start, using a temporary fuel tank.
Finally got the drill out and couldn’t get it to run for more than a few seconds in the test tank.
Finally took it out of the water and it did stay running, but of course, I couldn’t run it long enough
to ever try adjusting the carb.
I’ll probably recheck compression tomorrow.Looks like a Martin 20 Racer!
Prepare to be boarded!
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