Super 55 low oil pressure

I finally got my new oil pressure gauge hooked up and working on my s55. The oil pressure is in the low range. Any ideas on where I can get a replacement or rebuilt kit for the pump? I have been searching the internet without any success. Thanks for the help.

Before you go all out with oil pump, check to see if the oil tube and
disc might be missing in the oil filter

Do you have the aluminum or cast base?

Hook a good calibrated test gauge to it and see what you've got. Some of these new gauges aren't good for anything
but decoration.

Check to assure you have the oil filter inlet tube and restriction orifice installed before you do any major pump work. I was experiencing low oil pressure on my super 55 ever since I bought it. When I went to change the oil last week I found the inlet tube and orifice were missing from the oil filter base. I've included a photo of the existing aluminum filter mounting bracket and a cut of the filter mount associated with an Oliver 66 with part numbers 94 and 97 highlighted.

After reviewing the somewhat limited information available on this and other forums, I decided to make my own oil filter inlet tube and make the restriction orifice part of the tube rather than a separate disc.

Using a short length of 1/4 OD steel fuel line I made the tube shown in the following diagram. The tube easily fit into the existing aluminum oil filter mount with a light snug fit. Without the tube, the oil pressure gauge ran in the middle of the red low zone, but with the tube installed and drilled with a #42 bit for a restriction orifice, the oil pressure gauge now runs in the lower portion of the black working range with the engine warm.

In hindsight, I should have followed other users' advice and drilled a smaller orifice hole, perhaps between 1/16 to #47. Next time I change the oil filter I may pull out the tube and resize the orifice.

Common on Case tractors as well. Unknowing person changes the filter and the tube stays in the filter. Don't ask me how I know.

I am fairly certain I am missing the tube. I will look into that. Thanks!

This post was edited by JDSuper55 on 09/15/2023 at 10:47 pm.