Dumbfounded!
Thread Starter
Senior Member
Joined: Sep 2011
Posts: 7,381
Likes: 435
Dumbfounded!
So I have been having compression issue with my 97 5.4 PI Swap setup. After dping compression and leak down testing, I thought I may have had a cracked ring because of the gapless ring package may have been to tight. Well over the last oil change I had purchased some RevX used for diesels oil treatment(the stuff used by a oil of the 6.0 PSD guys). Also switch to Rotella 5W30 Synthetic diesel oil for that change. Here is what I found.
Upon change the oil I decided to do another leak down and compression check. compression on all 8 were over 180 which is great for cylinder walls that have over 190k on them. Leak down went from around 27% on the bad cylinders to around 8%. So all 8 cylinders are around 7%-8%.
But here is where I'm still having oil issues. I know now its not blow by. I installed a catch can on the PCV side to really see how much oil is being sucked thru. In over a 3500Mile oil change interval there was 1.75 qts of oil in my catch can.
So the question for you guys. How the hell do i stop this or reduce it? My typical intervals in the summer months is 3500. But I switch to a different oil and interval during the cooler months which is 5000 miles. So I am dumb founded as to why my particular truck pulls that much oil out.
Upon change the oil I decided to do another leak down and compression check. compression on all 8 were over 180 which is great for cylinder walls that have over 190k on them. Leak down went from around 27% on the bad cylinders to around 8%. So all 8 cylinders are around 7%-8%.
But here is where I'm still having oil issues. I know now its not blow by. I installed a catch can on the PCV side to really see how much oil is being sucked thru. In over a 3500Mile oil change interval there was 1.75 qts of oil in my catch can.
So the question for you guys. How the hell do i stop this or reduce it? My typical intervals in the summer months is 3500. But I switch to a different oil and interval during the cooler months which is 5000 miles. So I am dumb founded as to why my particular truck pulls that much oil out.
So I have been having compression issue with my 97 5.4 PI Swap setup. After dping compression and leak down testing, I thought I may have had a cracked ring because of the gapless ring package may have been to tight. Well over the last oil change I had purchased some RevX used for diesels oil treatment(the stuff used by a oil of the 6.0 PSD guys). Also switch to Rotella 5W30 Synthetic diesel oil for that change. Here is what I found.
Upon change the oil I decided to do another leak down and compression check. compression on all 8 were over 180 which is great for cylinder walls that have over 190k on them. Leak down went from around 27% on the bad cylinders to around 8%. So all 8 cylinders are around 7%-8%.
But here is where I'm still having oil issues. I know now its not blow by. I installed a catch can on the PCV side to really see how much oil is being sucked thru. In over a 3500Mile oil change interval there was 1.75 qts of oil in my catch can.
So the question for you guys. How the hell do i stop this or reduce it? My typical intervals in the summer months is 3500. But I switch to a different oil and interval during the cooler months which is 5000 miles. So I am dumb founded as to why my particular truck pulls that much oil out.
Upon change the oil I decided to do another leak down and compression check. compression on all 8 were over 180 which is great for cylinder walls that have over 190k on them. Leak down went from around 27% on the bad cylinders to around 8%. So all 8 cylinders are around 7%-8%.
But here is where I'm still having oil issues. I know now its not blow by. I installed a catch can on the PCV side to really see how much oil is being sucked thru. In over a 3500Mile oil change interval there was 1.75 qts of oil in my catch can.
So the question for you guys. How the hell do i stop this or reduce it? My typical intervals in the summer months is 3500. But I switch to a different oil and interval during the cooler months which is 5000 miles. So I am dumb founded as to why my particular truck pulls that much oil out.
I was pulling in a lot of oil to my intake at one point, coating everything and it ended up being a collapsed vacuum line soft connection that I never caught because I was never under the hood with the engine running.