i am wondering on my 93 f150 4.9l if the oil pump is going bad. it ticks when at high rpm and you can barely hear it when idling. i have tried thicker oil and stuff but doesnt seem to work. and when i have truck off after running and the hood open i hear the oil draining back into the pan. i have a motocraft filter and am running 20w-40 oil right now.

what i am thinking is the pump is not pumping enough at higher rpms.

 

Do all lifters tick or just one? Where is the needle on the gauge? These motors can run on 10-15 lbs of pressure, the only way to see is to hook up a mechanical gauge.

 

the lifters on a 300-6 are known for going bad....if you havent swapped them it may be a good idea....and valve springs get weak with age...

 

Dont they use the same lifters as a v8?

 

I am wondering the same thing. My oil pressure runs between the N and O in normal and under a load or at high RPM

 

I have been wondering the same thing. My oil pressure runs between the N and O in normal and under a load or high RPM it makes a ticking sound. Sounds like a valve train rattle? Is this a common problem, its a 93 with the 5.0

 

back in april i had taken my head off and got the valves ground and stuff so i replaced the lifter with COMP CAM ones cause it was ticking and i was told that was the problem. so i put them in ran break in oil and did the 2000rpm thing for 20min. the needle runs normal like in the middle. cause that is a dummy guage anyways like you said unless i hook a mechanical guage up i cant tell. i have been wanting to hook one up in the cab so i can see what i am running

 

well i know the pump might be worn and the lifters might be bad. i decided to check the oil finally after the needle moved that much and no reading on dip stick so i go to store with it quick get a qt of lucas stabilizer and 2 qts of cheap 20w-50. well it took the lucus, and 2qts of the oil so i go back in and get 3 more qts for just in case after it is full. so 3.5 qts later it is good. its actually been sine july 4th since i did an oil change and checked it. i went mudding that weekend and didnt notice any oil leaking. then 2wks ago i went mudding again which im thinking i was 3qts low that time.

well these engines r good runers for running low on oil, let me say that.

cant notice any place where it is leaking.

 

the oil pumps tube sometimes comes loose...

 

k i will check that tomorrow