Model B Oil Pressure

[/QUOTE]I believe Gerald J. should be added to the Memorial section. I had forgotten about him, he did have lots of knowledge.

YES... my point was if the FILTER is plugged, then no oil is dumped to sump... I  goes thru the cam and it goes ( at the filter housing) thru the 1/8 inch tubes to the rocker arms and governor.

Edited by steve(ill) - 23 Mar 2024 at 9:20am

Ok I kinda get it now.Its been years since I’ve rebuilt a B engine but I have an old engine from a C. I guess I will have to take it apart so I visualize it better.

No.... the pump does NOT pump oil thru passages in the crank and FORCE oil thru the main and crank bearings, like a regular car/ truck engine..

My CA had low pressure when it locked up It had water changed to Ice in the pickup. When I took it apart the plug was missing from the front end of the cam. I got one and the spring from the Agco dealer when I put it back together. It had normal pressure. The only thing I did to the pump was replace the sheared drive pine in the rear end of the cam.

Yes, air is a must, but I have checked for those multiple times with no leaks.  

Interesting forum.   I did not have an issue with the oil pump leaking down until I changed oil to 10-30W.  Now the freshly rebuilt pump leaks down and will not show external oil pressure until primed.   I prime by removing the filter and using a small oil can pump into the port where the vertical tube goes and pump three or four times.   Quickly reinstall tube and filter and then I get oil pressure after about 15 seconds.  Now why.   apparently the external 1/4" tube leading out of the oil pump is bleeding oil back down that tube.   Why???   I made a fixture when I rebuilt the pump to measure the clearance between the cover plate and the rotor.   My manual says it has to be .00" or less.   I got mine down to .001" by using two .005" gaskets in the kit and dressing the cover down.  My new rotor sits proud of the pump housing by about .007-8" thousandths, just like the old one.  I see how the system works, but looking for the answer to this riddle.  From what I see, the filter cannot affect oil pressure.  the oil is pumped up the tube and gravity feeds the filter media and then just drains back into the case.  the line to the guage is just measuring the oil that gets dripped into the filter.  Its free flow.   Someone mentioned a Wix filter.   How is that different?

Creston, keep us updated. I just overhauled a CA, and I have the same problem.

Your shop looks about like mine lol! Except mine has 3 tractors crammed in there too!

Ok. I guess I'll separate the engine from the torque tube as soon as I get time (May be a couple weeks. In the process of moving to and starting college) and have a look. If it is sloppy, where can you get rebuilt pumps? I did a google search, and I can find kits all day long, but no pumps. 

No, I didn't remove the pump. What do you mean by if it's sloppy or not? The rotor wiggles inside the housing?

Ok. So how do I go about disassembling the pump? Does the rotor just pull out?

So how do I get to said stem?  Is it behind (I guess technically it would be in front of) the rotor with the vanes?

CrestonM wrote: The gasket was not quite paper thin, but pretty close! The cover also has a circle worn in it, so should I machine that smooth? Also, when you mention the ball in the stem...Are you talking about the oil filter tube? If so, there is no ball in it.