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wesk escribió:Oil when you first start up is cool and thick. This combination equals higher pressure readings. Oil that has reached normal operating temps is hot and thin. This equals lower pressure readings. So the phenomena you are seeing is quite normal.
Now the manual gives you some operating ranges that are acceptable. When we evaluate a jeep's oil system we want to use the temps we find when the engine, coolant and oil are all at their normal operating temps.
No matter what viscosity oil or brand oil you choose to use these standard limits of oil pressure apply the same.
30 to 35 PSI at normal operating temps and cruising speed. (between 2000 and 3000 RPM)
10 PSI at normal operating temp at idle. (600 to 750 RPM) This is a minimum pressure
As mentioned above make sure the pressure readings you are seeing are accurate. You can mechanically apply accurate pressures to the sender and check for the correct readings on the gauge or you can tap a new known correct mechanical gauge into the system.
You must first be sure of the accuracy of your meter before you tear into the engine.
If you gauge proves accurate then your pressures are well below limits and indicate either a failing oil pump or excessive bearing surface clearance. These clearance issues that cause the loss of oil pressure can be at the main or rod bearings, the lifter bodies, the cam bearings both shell bearing front and the two non-shell surfaces center and rear. Also at fault could be the cam's rear journal welsh plug, the oil gallery plugs inside and outside of the block and the oil spray nozzle at the front of the block. Excessive wear of oil pump gears, pump case or cover and relief valve components.
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