Farmall Cub

Cub no oil pressure. I have oil pumping into the oil canister with mechanical gauge installed but still no pressure

If you can see the oil going into the filterr canister then the pump is working. It sounds like either a bad guage or valve.

It wont buid up the pressure in the canister. Its not pumping the oil fast at all.I relaced the mechanical gauge with another still no reading.I even changed reliefvalve. Any help would be greatfull

Engine oil pump probably puts out about 2 gallons a minute at full engine rated rpms. Engine cranking speed - oil entering the oil filter housing - won't be very fast. Only a portion of the oil pump's output enters the oil filter housing - called a partial flow system.

Couple of questions:
Engine recently rebuilt?
All of the plugs installed in the oil galleries?
What is the history on this engine?
Have you started the engine? Takes perhaps 20 seconds for oil pressure to come up at engine start up.

As Eugene said it takes a bit of time for oil pressure to build especially if the filter housing is empty. It will never build readable pressure at cranking speed.

how about some history. newly purchased, newly rebuilt, just quit?

Rebuilt engine no oil pressure at first then I saw what was posted that had to prim pump. Wasnt getting nothing until I primed now its not building pressure. Engine runs good just dont want to run without pressure on the mechanical gauge. The gauge is good put on another cub and had 20 pounds of pressure. Dont know what to do.

With the new pressure switch in it will not put out the oil pressure light.also put this switch in another cub and it put the light output

djknight wrote:With the new pressure switch in it will not put out the oil pressure light.also put this switch in another cub and it put the light output

Are we talking about a Farmall Cub or something else?

With the new pressure switch in it will not put out the oil pressure light.also put this switch in another cub and it put the light output

Oil pressure light indicator = sounds like one of the numbered Cubs. Same engine as a standard Cub.

Question. Newly rebuilt engine? Common fault is not replacing the plugs in the oil galleries. One under the valve tappet cover and one under the cam shaft timing gear.

Edit: Oil pressure regulator valve installed?

Will I need to tear engine down to replace plugs in the oil galleries

What else can I do

djknight wrote:Will I need to tear engine down to replace plugs in the oil galleries

Have you had the engine apart lately? If not, chances are they are not the problem.

It is a 1969 ih cub 154.just been rebuilt. Runs real good.scared to run any more because of oil pressure. Are the bearings getting any oil with me getting oil in the filter canister.