ONLY 30-50?? Its been my experience that when doing the oil test, the pressure jumps by ATLEAST 100.. IF its rings.
You might want to revisit the valve adjustment..
if a valve is hanging up and not closing when it should, compression will escape giving you a false reading.
Remember, you want to get enough oil in the cyl. to cover the top of the piston and have the oil fall off the sides to create an oil seal.. then test. quickly.
BTW> what are you calling "perfect" pressure on the other 2 cylinders.? over 300psi??
ONLY 30-50?? Its been my experience that when doing the oil test, the pressure jumps by ATLEAST 100.. IF its rings.
You might want to revisit the valve adjustment..
if a valve is hanging up and not closing when it should, compression will escape giving you a false reading.
Remember, you want to get enough oil in the cyl. to cover the top of the piston and have the oil fall off the sides to create an oil seal.. then test. quickly.
BTW> what are you calling "perfect" pressure on the other 2 cylinders.? over 300psi??
Something to try yet would be to remove the rocker arms or pushrods and then put shop air pressure into each cylinder one at a time and see where it comes out. If the heads gasket is not sealing between 2 and 3. The air you put the in 2 will come out number 3 glow plug hole or injector whichever you removed to do compression test. If it comes out the intake or exhaust then the new head is no good.
Could you walk me through this a bit further? Couldn't I rotate the engine until the valves are both closed on say #2 and blow air in through the glow plug hole and see if it escapes somewhere?Something to try yet would be to remove the rocker arms or pushrods and then put shop air pressure into each cylinder one at a time and see where it comes out. If the heads gasket is not sealing between 2 and 3. The air you put the in 2 will come out number 3 glow plug hole or injector whichever you removed to do compression test. If it comes out the intake or exhaust then the new head is no good.