Posted by TX656 on May 30, 2009 at 19:54:58 from (71.48.164.78):
Like CH 1080 I also just finished a rebuild and now I have low oil pressure. My tractor has the c263 gas engine. What would normal oil pressure be on a fresh overhaul for this engine?
I replaced cam bearings, rod bearings, main bearings, rings, pistons, sleeves, and exhaust valves. All journals were within spec. Engine had 20+psi before rebuild; now it has about 12psi at 1500 rpm, 16psi at a little higher rpm, cold or hot. Running 15-40 Rotella (for low ash). Not getting a low oil pressure indicator light but I have no idea if that light
The oil pressure gauge is aftermarket. I replaced the plastic line that feeds the oil pressure gauge as part of the work I did on the tractor. works.
I used the black engine rebuilding lube that the gearheads at work recommended (vs. white grease.) Could this black stuff be plugging up the oil screen? I didn't go nuts with the quantity. I haven't dropped the pan yet. I didn't pull the oil pump apart when I had it out.
I called the place where I usually get my tractor parts to price a new oil pump but they said only used pumps were available.
Only oddity in the overhaul occurred at the machine shop. I watched the shop owner install the cam bearings and he misaligned one and had to eccentric the hole in the cam bearing a bit but I'm not seeing any way that small enlargement in the bearing thru hole would affect the oil pressure any. (Still, on any future engines I'm doing cam bearings myself, tool is only about $120 on Amazon)
What do you guys think? Should I try a different oil pressure gauge? Should I just use the tractor and not worry about it?
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