Oil Pressure

[bobscj]

I recently re-built my 9N, forgot to grease up the oil pump to prime it. So I went thru the pressure by-pass fitting, that did not work.
I also installed a new Governor and ran the oil line from the bottom of the canister, blocked off the line to the block, and kept the rear block fitting from the canister, which also feeds the gauge.
It seems that when I fill the oil filter canister, the filtered oil is going to the governor and is leaking out to the pan, which in turn leave a void in the canister.
My thinking is the pump is filling the canister, and won't show pressure until it full.
As a thought .... why can't a check valve be put in the pick up tube
Bob

 

[R Geiger]

Your thinking is off base, pressure is created by the resistance of the oil going thru the bearings. If you have NO pressure, the pump is not primed. I remove the pressure relief plug and spring and fill the pump with oil through that location.

 

[wore out]

It's a bypass oil filter, only a small fraction of the oil pumps output flows through and orifice and is filter and returned to the crankcase through the governor.

It does NOT need to have filled with oil for oil pressure to build up and show on the gauge.

 

[Den N Ms]

,Just take the line loose from the gauge and hook a oil pump can, old time ketchup squirt bottle full of motor oil or garden pump up sprayer with a piece of vacuum hose to the line. Put about 2 cans/bottles of oil in there, hook the line back up to the gauge and start it up, then watch for oil pressure when cranking over or as soon as it starts up. If not shut it down and repeat. Putting oil in there fills the oil galley, primes up the pump and oils the crankshaft, cam, and rods. Plus it is much easier, and less of a mess than the relief plug at the front of the engine that sometimes takes two or three tries to get it to prime.

 

[bobscj]

(quoted from post at 08:41:09 08/02/20) It's a bypass oil filter, only a small fraction of the oil pumps output flows through and orifice and is filter and returned to the crankcase through the governor.

It does NOT need to have filled with oil for oil pressure to build up and show on the gauge.

I under stand the function and the limitations of the filter, that's why i changed the tubing to go to the Governor.

Stay Tuned!

 

[bobscj]

I understand that thinking, Then why is the oil passage terminate at the fitting in the rear of the block, or is this residue pressure that goes to the gauge and filter??

Stay Tuned
Will pull the pan and reprime the pump. If it doesn't work its going in Dah River. Will use as a sinker for Salmon!