gmk

Hey Thanks Guys! Things are so much easier to understand with pictures for me. I do have two filters made by different manufactures and I am still unclear about where the check valve that may be in it is located. But this certainly helps the original concern. Thanks!

Just recently got our "new" 1948 Pilothouse going and found we are rapidly spewing oil out of a failing seal at the top of the oil filter (replaceable cartridge type). Of course a new seal under the screw on handle is obvious. But both the rate/pressure which the oil cam out, and the fact that once I took the lid off of the canister the oil took a considerable amount of time to drain down from the very top to the level of.the holes in the center tube caused me to question the way the pressure relief valve works. Does the slow draining back down (with engine off and the top of the canister off) indicate the failure of the pressure relief valve? Also does the pressure release valve keep oil from ENTERING the filter when pressure is insufficient or prevent it from EXITING the filter when the pressure is insufficient? I guess I just don't quite get the layout. Figure I should be able to test the valve with air pressure but don't know the right place to apply pressure. Also it would also be very helpful if someone could let me know where I might find a diagram on line that clearly shows the circuit the oil follows. It seems as if this pressure relief valve must be threaded into the block form the inside accessible only with the oil pan off? Any help would be appreciated. Thanks, Grant