old car fan Posted November 30, 2019 Share Posted November 30, 2019 Anyone know what the compression should read,the manual really don't tell me Link to comment Share on other sites More sharing options...
studeq Posted December 1, 2019 Share Posted December 1, 2019 I'm not certain but I do believe they did compression testing back then (1920). Probably the reason you cannot find the specs. My guess 60lb or so. What have you got? Link to comment Share on other sites More sharing options...
old car fan Posted December 1, 2019 Author Share Posted December 1, 2019 (edited) They all are solid 45#.The manual mentions a Gauge , must be in a certain color area. Edited December 2, 2019 by old car fan (see edit history) Link to comment Share on other sites More sharing options...
STUDE48 Posted December 17, 2019 Share Posted December 17, 2019 Put a little oil in each cylinder crank it over sounds like you have either dry or worn rings. On my 20 special six I had weak valve springs, the valves were really slow to close from sitting, also they are only lubricated by the fuel mixture passing through them the stems were very gummy and dry from extended sitting pull the side cover and have someone turn the crank and watch the valves open and close. Spray a little spray oil on the stems and retest. I have 75 lbs on my 20 with the starter, I can realize 60lbs by hand and it will start with the crank. Hope this helps Link to comment Share on other sites More sharing options...
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