Re: 656 Low Oil Pressure after rebuild (like CJ 1080)

Posted by TX656 on May 31, 2009 at 12:35:53 from (71.48.164.78):

In Reply to: 656 Low Oil Pressure after rebuild (like CJ 1080) posted by TX656 on May 30, 2009 at 19:54:58:

Thanks for all the advice so far guys. Regarding the assembly lube, yes, all bearings, cam surfaces, etc we're coated by me with the engine assembly during assembly (I don't remember the brand name of it.)

Got up at 5:30 and moved the tractor back into the shop.

It was colder outside so oil pressure started at 30# at 1500rpm and then dropped to 20# at 1500 rpm after engine warmed for a couple of minutes. Dropped rpm's to low idle and pressure dropped to about 5#. That's a little different than I originally posted when I said there was no difference in oil pressure cold or hot. That was an incorrect statement on my part.

#1) I put a different oil pressure gauge on it and pressure read right at 20# so the gauge isn't bad (bummer.)

#2) Next I drained the oil and pulled the pan. Nothing plugging up the filter screen. Took bottom off of oil pump. There is almost ZERO gear wear on the base plate, the bottom of the gear itself is a little polished, and lower 1/2 of each gear tooth surface shows a little wear but nothing that makes me think this pump needs to be replaced.

#3) Next I pulled off the filter base, double checked to be sure I had the correct gasket installed, yep it matches the filter housing (vs. only matching the block).

#4) Next I pulled out the 3 check valves and inspected the conditions of the seats. The valves are fiber (vs. metal) and the seats aren't smooth like in a head. Sprayed everything with brake cleaner and swapped two of the valves around (not the one with hole in it) and then it was time for church.

Now I'm off to the children's piano recital so I'll start it up this pm to see if the valve removal replacement made a difference.

Next?? Thanks for all the ideas so far. I'll keep trying them.

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