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Fuel Selector Valve
We were doing the annual on a 1973 Cessna 172M today and discovered the fuel
selector valve would not shut off the fuel - in any postion. The handle is not slipping on the shaft and there is mechanical connect through the linkage. The detents can be felt in each position and we can visually see the component turning on the exterior topside of the valve assembly. So the valve has to come out so we can examine it thoroughly. Anybody experienced this? Tom Cummings |
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"Tom Cummings" wrote in message hlink.net... We were doing the annual on a 1973 Cessna 172M today and discovered the fuel selector valve would not shut off the fuel - in any postion. The handle is not slipping on the shaft and there is mechanical connect through the linkage. The detents can be felt in each position and we can visually see the component turning on the exterior topside of the valve assembly. So the valve has to come out so we can examine it thoroughly. Anybody experienced this? Tom Cummings I just rebuilt one in a '56 which is probably the same or similar. Getting to it is difficult --- you remove two inspection plates on the belly and then you must remove the valve. You have to take the u-joint out from the cabin by pulling a few screws, iirc, and the cotter key. Just take a look at the manual. The fuel selector is operated by the movement of a cam on the selector shaft which moves ball bearings which push another larger ball off the o-ringed seat for the appropriate valve to open. When the selected valve is closed, a spring pushes the larger ball against the o-ring and retainer. When the o-rings go bad, the valve will not shut off the flow of fuel. Simple repair, and o-rings are cheap, but hell to get to and to put back. |
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