Re: 1950 Ford 8n Funk 6 cyl

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Posted by KCM on June 18, 2020 at 22:15:42 [URL] [DELETE] :

In Reply to: Re: 1950 Ford 8n Funk 6 cyl posted by Steven on June 17, 2020 at 22:57:47:

Noticed there are three with 0 compression. The old flatheads are notorious for valves that stick open if the engine has sat for some time. Not much oil gets up to the valve guides to keep them lubricated like an overhead valve engine. They will open but the spring force is not enough to close them due to rust and other build-up. You can take of the valve covers on the block behind the exhaust manifold to gain access to the springs to get them lubed and moving. You can also stick a screwdriver through the spark plug hole to push the valves down if they are not stuck too bad. Otherwise you can pull the head again.

#5 and #6 could simply be due to dry cylinders. A few squirts of oil in the cylinders will boost compression, and the pressure will increase once the engine starts and cylinders get lubed.

#1 might also benefit from some oil, but might also be due to the valves not sealing properly. Would not worry about it till you get the engine started, then you can recheck the compression.

Not sure how bad the pitting is, but I suspect you should be able to get it running before condemning the valves. If they do need to be ground or replaced, they are removed by removing the cylinder head and side valve covers, then removing the springs in a conventional method. The valve seats in the block should be ground as well, which is done with the old style valve seat grinding tools.


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