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Oil Field Engines & Related Equipment

Fairbanks Morse ZC-52 more help!

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Old 10-24-2006, 10:24:17 AM
Adam L. Adam L. is offline
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Default Fairbanks Morse ZC-52 more help!

Your replies were very helpful and thank you. The engine is running much better now but is still misses and pops more than it should. It still runs perfect on the prime tank. When its on the run tank it will run good for a minute and then spit and sputter for a minute, then run good for a minute more. I let it run for about 30 minutes but no change.

I made sure that it was not leaking air around any of the joints and i removed the flutter valve (new) and did some work on it.
It has brand new valves, seats, and springs in the head but it blows a little gas back threw the intake. When i hold more tension on the intake valve spring this stops and the engine runs quite a bit better. Does anyone know what this means? Thanks in advance for all the help!
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Old 10-24-2006, 02:37:18 PM
Jim Gorter Jim Gorter is offline
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Default Re: Fairbanks Morse ZC-52 more help!

Sounds like you have found at least a partial answer to your problem. The new spring may still be too light to hold the intake closed. Try a stiffer spring or some guys put spacers under the spring to increase the tension a bit. While you have the spring off, move the valve in and out to check for smooth operation and turn the valve in the seat to make sure there is no carbon on the faces holding the valve open, Good Luck, Jim.
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