toyota surf oil pressure problems

[THEFERMANATOR]

What is the oil pressure cold? What is it hot? Does it go higher if you give it throttle? Do you know what the oil pressure spec is for the bypass valve? Is it a dump to sump or dump to pump bypass valve? I know my DURAMAX will hit 75-80 when cold at an idle with 5W40 oil in it. Some small diesel engines will run some pretty high oil pressure in them at an idle when cold as well. The 5.9L CUMMINS in 98 when they went to the 24 valve engine went ot a dump to pump bypass valve, and these engines would hold 110 pounds of oil pressure cold, but only 40 or so hot. The previous gen of engine with a dump to sump bypass valve would peg out around 85-90 cold though, and run about 40 hot.

[aussie]

at idle 100psi if u just touch the throttle it bends the needle . if you let it get hot at idle it wont go past 80psi it pops the oil filter seal if u try to drive it cold i took the pressure relief valves out and still the same the pressure should drop down with them out finally got a hold od a drawing of the oil circut ill try and post it

[Destroyer]

This is probably NOT the answer, but...Pressure rises as galleys get restricted. Todays ultra hot engines sludge the oil and coat the galleys quicker than in days of yore. I don't know the engine, or anything about it, but I would check and make sure that all the oil passageways are clean. If it is a blockage or restriction it will be after the oil pressure gauge pickup. Just my 2 cents.