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HPOP oil levels

20K views 14 replies 11 participants last post by  Fordman247365 
#1 ·
I was wondering how do I check the levels in my high pressure oil system? Is it a closed system or does it use my engine oil? When i get an oil change do i need to change the oil in the HPOP.? I'm still learning the ins-and-outs of my diesel engine.
 
#2 ·
SUBBED
JER-1
:icon_ford:
:thumb:
 
#3 ·
It uses the engine oil system. The LPOP supplies the HPOP. The only time you wouk=ld have an issue with losing oil in the HPOP is if the LPOP is bad or you are low on oil or are suffering from a drainback issue. The drainback issue is found on the 94.5 and 95 engines.
 
#4 ·
They say to change the HPOP oil as well...even tho it uses the engine oil, it basically gets up there and stays, it only takes a few extra minutes to change it, but you will need a small hand or vacuum pump to pump out the oil. you can only get it out about a quart at a time but there is only 3 quarts up there. basic....remove a quart, add a quart. replace plug and run engine to circulate HPOP oil. remove plug take a quart out, put a quart in. repeat until hpop oil is clean. your injectors will love you forever for doing this
 
#13 ·
This is a waste of time. If you want to do it, by all means go right ahead, but within a few minutes all of the oil there is renewed anyway.
 
#5 ·
thanks for the quick responses guys. I recently switched back to thicker oil from a synthetic 5w30 to a conventional 15w30 and have noticed smoother idle, and maybe even a little more power. Does the HPOP run better with thicker oil or does it make a difference?
 
#6 ·
I think you should be using 15W40 if dino oil. I did the hpop oil change in my 94.5 and removed sludgy crap then added Rotella plus a bottle of Duralube. Made an awesome difference in my truck (can't speak for anyone else). Be forewarned however that there's a few threads out there that end in p*ssing contests about doing this. I don't think this is something you need to do at every oil change as it's a total pain in the a$$ to do. I was figuring on maybe doing it once or twice a year.
I wasn't aware of a drainback problem in the early PSD. Can anyone elaborate on this more? My trucks no thang of beauty but it runs great mechanically and I want to keep it that way. :icon_ford:
 
#14 ·
I wasn't aware of a drainback problem in the early PSD. Can anyone elaborate on this more? My trucks no thang of beauty but it runs great mechanically and I want to keep it that way. :icon_ford:
also curious about the drain back

My 94 F350 (That I just picked up last Sunday) did that to me, after sitting in my garage for a day or two. I put about a quart in the HPOP reservoir and it's been running fine since. When I bought the truck, it was about a quart low in the crankcase. Started fine when I bought it, but drained back at home.

I did top off the oil in the crankcase, as well as the HPOP reservoir. No problems since.

I intend on doing the standpipe mod and using the reservoir from a 96. They didn't have the drain back problem...
 
#7 ·
also curious about the drain back, and i have no oil pressure coming out of my HPOP,like if you take the steel braided line off the valve cover and crank the truck over only a trickle of oil comes out of the line, and i was told that it should blast out at close to 600psi ????
 
#8 ·
^^^^ thats not right it should be blasting out of there. you might have a low oil pressure issue. i would check to make sure your getting low pressure oil and if you are maybee your hpressure oil pump is shot. I change the oil in the top end, i dont care what anyone say about it being necessary or unnecessary. at the end of the day replacing any old oil with new, is a good idea, especially if your changing oil viscosity
 
#9 ·
ok thanks !! i know it has good oil pressure on the gauge while it cranks over. but the IPR on the HPOP is all loose and wont tighten up and i can move it all around by hand its loose so ???? :dunno:
 
#11 ·
sorry about that!! g/f is workin on gettin her paypal up, her Credit card is expired and we need to wait for the new card! i did pm you but you said you didn get one befor ? , yes i does want that pump and such, even if it aint my problem it be nice to have, but im pretty sure it is wouldn yah think bud ??
 
#12 ·
i dont totally understand the drainback. i have heard if you have a 94.5 or 95 you need a different replacement HPOP? Cant use one from a regular 96 or even the 17* from an NBS?
 
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