1939 H

[rustred]

Do u have the correct ring end gap.the spec is .004 for every inch of bore. I have see it years ago on case 900 someone installed rings from a smaller bore. The guy had to pull it should the yard to get it started. But it still ran. I replaced the rings with the correct ones and it would then start east. I would drag it around and see what it goes. Just makes no sense at all to have 0 compression.

The model D has compression release valves on each side you had to open when hand starting them. That’s how much compression they had. From what u are saying you can wheel the engine over with the plugs in and it is the same as the spark plugs out ?

 

[J.Wondergem]

The model D has compression release valves on each side you had to open when hand starting them. That’s how much compression they had. From what u are saying you can wheel the engine over with the plugs in and it is the same as the spark plugs in. ?

I think that you meant plugs out.

 

[rustred]

Yes compression stroke. Had head off three times. New gasket, and it’s the proper configuration, torqued down tight.
Yes air will push the piston down pretty fast, yet zero compression on the compression stroke. Only thing left is sleeve the cylinders and that seems to be a complete waste of time.
I might drag it around the yard today in gear and maybe everything just needs to settle in.
Don’t know what a “ticketed mechanic “ is.
went to mechanic trade school when I was young, built some pretty fast cars in the 70‘s . I don’t know new engines but know the old stuff, until now !
Thanks, Tom

ticketed, licenced, jouney man ... all the same thing.

 

[Farmalldude45]

Thanks
Four new valves, cut seats. .020 rocker clearance on both intake and exhaust. I know that’s a lot but at this point more clearance Is better.
New rings, light hone on cylinder. Cam timing correct, checked dots on gear and confirmed with visual TDC and flywheel. Not enough compression to move the needle on the gauge. Yes the gauge works. I can easily hold my thumb over the plug hole during compression cycle. Charge cylinder with air on TDC and nothing blows out of intake or exhaust port, can hear some air escape into crank case. But I should still have some compression ! Ok what did I leave out?
Thanks,Tom

In order to build compression, the cylinder must take in air. Is it possible that the intake is blocked in some way? I think you could check this by rolling it backwards, making the exhaust the intake. A long shot, I know, but you've about exhausted your options.