Start on the top end and verify that the exhaust valve is closing and seating. Then go from there, removing the head if you find it necessary. If the engine has been allowed to get water into the valves, there could be rust or carbon on the valve and seat. Try taking the valve rocker arm assembly off, turn the engine until this piston is up, put something into the cylinder against the valve and remove the valve spring by removing the keepers, being careful to not let the valve drop into the engine. Then chuck the valve stem firmly in a small drill motor and turn the valve while pulling and releasing against the valve seat. Apply a little WD 40 through the spark plug hole to the valve seat area. Then clamp and hold the valve shut with Vice Grips and see if compression is improved. May save a head removal. Problem could also be piston or rings damaged or connecting rod broken?
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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