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O-Rings
Posted: Sun Dec 15, 2019 11:03 am
by 6319
I have a Cessna 120 Wing Tank fuel drain with a 1/4 NPT valve which needs a new o ring. Replacement ring seems to be an MS29513-006. Aircraft Spruce catalogue says MS29513 is not compatible with Auto Fuel. Does anyone have any experience with this?
Re: O-Rings
Posted: Sun Dec 15, 2019 12:46 pm
by 8401
I changed the whole drain. they are about $16 each. If you are fast you can change them with out draining the tanks. I lost maybe a cup or two of fuel.
Re: O-Rings
Posted: Sun Dec 15, 2019 2:57 pm
by 6643
MS29513 should be OK as long as there is no alcohol in the fuel.
If the drain valve is a Curtis valve, it is not rebuildable. The seal is not an o-ring; it is a flat washer, and the valve is known not to last through the second seal. When it fails all the fuel comes out.
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