hey guys. new to forum need help with 2000 psd . oil leaking out of hpop resevior over night or weekend. truck will start and run afew seconds and then stall. check reesevior and low. fill with oil and starts and runs fine. i cannot firgure out what is letting oil drain back. thanks for any advice.

 

Are the O-rings from the lines leaking? Mine did and eventually gave out all together and I lost all pressure and the engine shut down.

 

There is a check valve at the bottom of the reservoir that's probably bad.. Someone here on the forum can give you more info on fixing it..
Here is a good link on maintenance and mod's for the powerstroke..( I just tried it and it not working right now but i am sure it will later.) Bookmark it for future reference.. And Welcome to the Forum....
see;
http://www.7point3.com/mods.aspx

 

thanks for reply. no visible leaks on any lines or on resevoir.have been told there is check valve in front eng. cover, i have mitchell on demand on computer and it only shows check valve inside block. oil pressure is ok on low pressure side. so i'm not sure which way to go.

 

thanks for the link. i'll give it a try.

 

I'll get alot of flames for this but if you look at a drawing of the HPOP reservoir (can't find where I got it to link it), theres a standpipe inside on RH (facing it) side that comes up to about 3/4" from the top cover.

Oil from the LPOP flows into the HPOP reservoir through this standpipe to fill/keep it filled up as the HPOP pumps oil to the injectors. The oil coming into the reservoir and flowing UP this standpipe into the reservoir first flows through this "leaking" checkvalve.

So all you "leaking checkvalve" people, tell me how the reservoir oil that is lower than the top opening of this standpipe "leaks back". Ain't happening!!!!

Your LPOP pump in failing to replenish the oil in the reservoir as it is pumped out by the HPOP to the injectors. Thats why it starts and within 5-7 seconds will die, and not start again till you refill the reservoir, crank it, it fires, you "goose" it, which these increased rpms then force the LPOP to flow the cold oil to the reservoir. Quick and dirty cure? Goose it upon first starting on cold mornings. Long term, new LPOP pump (and check block walls for scoring before installing replacment).

I know everyone is trying to help each other out but alot of folks are just parroting what they've heard, whether it relavent or not. Just like EVERY "engine dies" malady is put forth on here as "its your CPS".

 

The reservoir gasket can be leaking. There is an O-ring between the reservoir and the front cover. You need to look there. This allows the oil to leak out of the reservoir under the standpipe and back into the front cover undetected.

Bob

 

I'm not going to diagnose your problem.Because I'm not capeable of doing so.but here is a great post exactly on your described problems.Please take a look at poster #4 link.Read all of that.Its from International I believe.https://www.ford-trucks.com/forums/5...=HPOP+DRAINING

 

Do you mean poster #3 link ? (which is me)...

 

I understand your thought on this, and honestly, I have never taken one apart... but, if you thought was correct, then there would be no need for a check valve then. Also, people have installed new check valves/repaired and the starting issues disappear. If is LPOP was weak, my guess is it would be noticed on the gauge (unless this is another "dumb" gauge).

 

DOUBLE POST

 

thanks for all the replys. iwill check out the gaskets first and then the pumps. thanks guys you've been a big help.i'll let you know what i find.

 

Heres the reason for the existence of the check valve::

"During initial start or cold start, the high-pressure oil pump receives unfiltered oil from the left side valve lifter oil gallery through the anti-drain back check ball valve. Once the engine starts or during warm engine starts, the check ball closes and the high-pressure oil pump receives filtered oil from the high-pressure oil pump reservoir."

And yes, during the cranking, the stock analog oil pessure gauge does NOT move when the reservoir is momentarily NOT receiving oil from the LPOP. Only when the LPOP starts to pump oil, will this gauge show pressure.

Also remember, if it "leaked down" overnight or whenever, then at first try to fire the engine, it would'nt, however most of the posters indicate the engine fired for a few seconds, died, then they found reservoir empty.

 

There is still oil in the HPOP & HP lines

Some reading on the subject....Here....

Scroll down to # 5....