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Antique Gas Engine Discussion Meet collectors of hit and miss engines, ask questions about collecting, restoring and showing antique flywheel engines.

Antique Gas Engine Discussion

Wet Head Question

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Old 06-03-2005, 09:20:54 AM
Sonny Sonny is offline
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Default Wet Head Question

Hi I Have A Wet Head That Has A Small Crack Will Gas Tank Sealer Work From The Inside Of The Head To Help Seal The Crack Thanks Sonny
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Old 06-03-2005, 10:37:09 AM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Wet Head Question

Sonny, remember these engines run at zero pressure unlike the radiator in your car which might run at 15 PSI or more. That means that things are in your favor when trying to seal a leak.
Be sure sealing is the method that you want to use however. If you seal it, you probably never will be able to change your mind and weld it, due to the crack being contaminated with sealer. (possible to grind it out if you have room I guess) If there is no way to weld it anyhow, then you have nothing to lose, and very great chances for success.

My favorite sealer is called "quik poly" and is a two part urethane epoxy that mixes like water and sets up in about 3 minutes. I'm not kidding- 3 minutes! Hard, dry, done! Even if you poured it 1/2 inch thick in the bottom of a tank. It can be drilled, sanded, tapped, machined, you name it. It soaks into rotted wood and restores it. It can even be used to replace a torn out section of a horse's hoof! You simply must try this stuff. I'm not a dealer and get no kickbacks, just a satisfied customer who saw the stuff 19 years ago and keep finding new uses for it. Call Kwik Poly in Missouri @ 314-344-8881 and tell them Kevin sent you. You may get an answering machine, just leave a message if you have to, they'll call you back.
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Old 06-04-2005, 09:18:59 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Wet Head Question

Is your crack on the exterior or in the combustion chamber? If it is in the combustion chamber where it is exposed to the heat and pressures generated by the engine firing, you will probably have to have the head welded The same applies if the crack is in the exhaust passages. Most sealers won't stand up to the heat and or pressure. If the crack is on the outside of the chamber, then JB Weld or one of the above posts will have your answer.
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Old 06-04-2005, 11:48:19 AM
Sonny Sonny is offline
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Default Re: Wet Head Question

Hello And Thanks For The Good Advice I Must Confess The Crack Is On The Water Side Not Even Sure If It Is A Crack About A Inch Very Fine But I Already Did Use Gas Tank Sealer 2 Coats It Is A 4hp Fuller Johnson Didnt Start It Yet Talked To Past Owner He Said That It Never Leaked For Him I Put Water In And No Leaks Yet Thanks Again Next Time Ill Ask Before Doing Sonny
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