Re: 1940 110 Compression

Posted by Owen_Dyneto on 2008/9/17 8:12:06
I assume you took the compression with all the plugs removed and the choke valve held open? And did you do it "dry"? If so, I'd add a tablespoon or so of oil into each spark plug hole, crank the engine over several times, and then take it again. If the readings increase significantly it indicates ring and/or cylinder bore wear, if they don't it indicates leakage at the valves which is far easier to deal with. L-head engines of this vintage typically need a valve grind every 30,000 - 50,000 miles, sometimes more frequently if driven consistently at higher speeds.

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