installed a 6.0 in my brothers truck, put in new oil pump . and sensor off the old 4.8 . when i start it the oil pressure will be fine at 60 then it will drop slowly to nothing . any ideas of whats going on . the 6.0 is a 2001
installed a 6.0 in my brothers truck, put in new oil pump . and sensor off the old 4.8 . when i start it the oil pressure will be fine at 60 then it will drop slowly to nothing . any ideas of whats going on . the 6.0 is a 2001
anyone i'am stumped
have you tried replacing the sending unit?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
tried that , i get more valvetrain noise as it warms upand loses pressure . i was thinking mabe it needs a new pick up tube o ring or the mains being worn has and causing low oil pressure.
I wonder if it's overheating and not reporting it. Sounds like the oil is thinning out severely. Do you have access to a infrared heat gun so you can get some external measurements? What oil pressure reading are you getting at cold start versus when it warms up?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
cold i get around 60 psi and goes down from there . it gets so low the warnig light comes on . the lifters will tick bad ,the i can cut it off and let it sit for a minute or two, then start it and the pressure will come up to 40psi and goes down to nothing . it takes about 5 mintues for the pressure to to be at 0.
Have you tried swapping to a new oil filter?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
2 full oil changes with wix filters
You can try and replace the oring and see if thats the issue, it is pretty easy to do. You could have an issue with a failing oil pump relief valve. It's good to see you have good pressure at startup.
You could do what I did, take the oil cooler return cover, located just above the oil filter, and make an aluminum test block off plate to stop oil from going through the engine. Drill a hole in the block off plate to line up with the forward hole. Tap the cover and put a manual oil pressure gauge in the hole. Start the engine and let it run for about 5 seconds while you monitor the oil pressure and then shut if off. I'd put the test plate in after the engine is hot/warm when the oil pressure has died. If you deadhead the oil and the pressure is still low then you have a pump or oring issue.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
tommorow i'am changing the pickup tube ,o-ring and the oil pan from the the 4.8 we took out . i'am going to try and blow out the 2 passages by the oil filter.maybe it's plug ad getting bad oil return
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