Well, with zero compression, my opinion is that the valves are hanging. Unless each piston has a hole in it. even sticky rings will provide a little compression.
So, check your valves to see if they have full travel and are closing all the way. Use a small brass hammer or similar. On each valve that has a loose push rod (ie. valve is closed), tap the valve and see if it moves. It should "snap" back with a distinct sound as it seats. If the valves don't snap back or make a sound when seating, you have valve issues. Could be corroded stems or rusted seats. Either will not seat and seal.
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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