I wanted to start my own thread about this and get some input. I've posted a couple bits of info tagging along on the end of this thread: https://www.naxja.org/forum/showthread.php?p=246711918#post246711918
So my '01 XJ, 4.0 Auto has the typical low hot oil pressure. Currently has 181K miles, replaced crack 0331 cylinder head @ ~ 110K miles. Been running fine every since... but I did not have any bearings replaced w/the head was. Noticed this past week that my Oil pressure gauge dropped to 0 / check gauges came on when idling at stop light this week on my way home from work.
Bought a mechanical gauge, pressure when hot reading a steady 15 psi at idle and jumped up to ~ 45-50 psi when revving to 2K rpms. After letting her idle for 10-15 min w/gauge hooked up the pressure dropped slightly to ~12 psi. I changed out the Pressure Sensor and it was reading about the same 12 psi on my dash. This morning I drove to get some coffee and while cold the Oil Pressure is ~ 55 psi... dropped down to ~ 25 psi on the gauge before I got home. Was up to full operating temps, but I had only driven it 3 or 4 miles... so not really too hot.
Also, just changed my oil ~ 1K miles back and have been running Rotella T6 5W-40 and BG Oil additive and Wix 51515 filter for the last 50K miles or so.
That all being said... I know my bearings could be shot or I'm on borrowed time, so I wanted to get some input on what bearings to replace and how do I know if they're Standard, over, under, etc w/out taking the engine apart first? Engine has never been rebuilt as far as I know. Any input or links to said work is appreciated. I can't seem to find the info I'm looking for my googlfoo these days.
So my '01 XJ, 4.0 Auto has the typical low hot oil pressure. Currently has 181K miles, replaced crack 0331 cylinder head @ ~ 110K miles. Been running fine every since... but I did not have any bearings replaced w/the head was. Noticed this past week that my Oil pressure gauge dropped to 0 / check gauges came on when idling at stop light this week on my way home from work.
Bought a mechanical gauge, pressure when hot reading a steady 15 psi at idle and jumped up to ~ 45-50 psi when revving to 2K rpms. After letting her idle for 10-15 min w/gauge hooked up the pressure dropped slightly to ~12 psi. I changed out the Pressure Sensor and it was reading about the same 12 psi on my dash. This morning I drove to get some coffee and while cold the Oil Pressure is ~ 55 psi... dropped down to ~ 25 psi on the gauge before I got home. Was up to full operating temps, but I had only driven it 3 or 4 miles... so not really too hot.
Also, just changed my oil ~ 1K miles back and have been running Rotella T6 5W-40 and BG Oil additive and Wix 51515 filter for the last 50K miles or so.
That all being said... I know my bearings could be shot or I'm on borrowed time, so I wanted to get some input on what bearings to replace and how do I know if they're Standard, over, under, etc w/out taking the engine apart first? Engine has never been rebuilt as far as I know. Any input or links to said work is appreciated. I can't seem to find the info I'm looking for my googlfoo these days.