My "C" had the same thing wrong with it. I tried all the other ideas until a old mechanic told me that the screen would be collapsed on the pressure regulator valve. He was right, that old knowledge is hard to beat. To get at the orifice you will need to remove the cylinder head which is held on with 14 bolts. They will be either 3/8 or 7/16 bolts. Mine had the 7/16 bolts which used a gasket #354354R3 and the orifice-screen #355372R93. This screen-orifice is about 3 inches long and 1/2 in diameter with a vent opening on the threaded end. Gasket was $11.44 and orifice was $77.67. Cured the problems on mine.
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Today's Featured Article - Talk of the Town: What's in Your Tractor's Toolbox? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew so much response and proved to be so interesting that we wanted to share it with you here. The names of the people participating in the discussion have been left out to "protect the innocent" (to quote a once-popular television series).
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