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Oil Field Engines & Related Equipment

Fairbanks ZC-52 Trouble

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Old 10-20-2006, 11:33:17 AM
Adam L. Adam L. is offline
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Default Fairbanks ZC-52 Trouble

I am currently restoring a Fairbanks Morse ZC-52 and I got it running off of the start tank perfectly. When i switch it over to the run tank i have to choke it fully to keep it running and even then it runs poorly. The fuel line assembly is new and i believe it to be set up correctly. The check valve seems to work well when i blow threw it and the line seems to be clean. Does anyone know what might be the problem?
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Old 10-21-2006, 08:10:53 AM
Allan Wright Allan Wright is offline
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Default Re: Fairbanks ZC-52 Trouble

Adam, it sure sounds like a check valve problem to me. Is the check valve in the tank or outside? Another thing to check would be to take the needle valve out and run a wire through the jet to make sure it is clear. Is there a union on the gas line that could be leaking?
Good luck with it.
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Old 10-21-2006, 08:39:30 PM
Jim Gorter Jim Gorter is offline
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Default Re: Fairbanks ZC-52 Trouble

Also check to make sure the small hole in the run side needle valve is clear and the gasket that holds the needle valve base is secure and tight, might be sucking air. Good Luck Jim.
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Old 10-22-2006, 11:07:57 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Fairbanks ZC-52 Trouble

Is the "flutter valve" alive and well? The flutter valve is the disc with a spring behind it that fits on the air inlet of the mixer. If the spring is too weak or missing or the disc is rusted or warped and doesn't seat well, that could cause it to not have enough suction to draw fuel from the tank.

The reason it runs okay on the priming chamber is that the fuel does not have to be drawn nearly as far.

Take care - Elden
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