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ford 8n low compression

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Greg Pinelli

New User
I have a 1952 Ford 8n with low compression. #2,3,&4 all had around 40psi, even after I replaced the rings, bearings, honed cylinders, lapped valves, etc. I am at a loss. Any suggestions?
 
(quoted from post at 11:00:48 12/26/12) I have a 1952 Ford 8n with low compression. #2,3,&4 all had around 40psi, even after I replaced the rings, bearings, honed cylinders, lapped valves, etc. I am at a loss. Any suggestions?
Click to expand...
ew rings in old sleeves? Did you run it in before taking measurements? Lapped??.....check for seal afterwards?
 
Did you use a good assembly lube when you installed all the parts?? ring on so as to not have the gaps line up?? And of course if you used the old sleeves and new rings did you measure so as to make sure the new rings would even fit right and have the correct end gap in the bore
 
Have you run the engine since the rebuild/overhaul work? Approximately how many hours?
Did you adjust the valve stem clearance between cam/lifter and valve after grinding valves? What clearance settings did you use there?
 
How was number one cylinder? I assume the throttle was blocked open with good airflow and you had sufficient cranking RPM? I'd do a wet test next since your dry cranking is inconclusive. If your results are still down I'd do cylinder leakage to narrow down the problem.
 
I agree with Old. Did you use the old cylinders? If you did, did you mike them or check them in any way? I can't see going thru one of these engine and not putting in new cylinders. That's the great thing about these engines. New cylinders equal new engine. Need more information as to what all you did to the engine.
 
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