There is always a bit of movement and with the old style without the
backing ring the D-rings moved a lot more and tended to wear the edge
to the point that it would leak under high pressure. With the white teflon
split ring that takes up the movement you no longs have that problem.

This one is an old type dummy plug and you can see the wear. (Same idea with the stand pipes.)



By adding the teflon split ring they solved that issue.



Sean

6.0L Tech Folder

 

Ok, so stand pipes SHOULD be changed at the same time as dummy plugs then? B.

 

Only if you know that they are the old style and you are having a pressure problem.
If not I would not do it unless you in there. Yes it's an easy job and not much to
mess up on it. Get the torque correct and oil the seals before you put them in.
One last note. Take something to mark the valve cover stud Vs bolt location for ease
of reassembly. You don't want a stud in the wrong place.



Sean

6.0L Tech Folder

 

Ford used to say never reuse the standpipes however I've reused them several times with no issues. I did replace mine when I built my engine 2 years ago because I had new ones in the headgasket kit. Concerning the OP's post, I have read, but don't recall from where, about a bad batch of standpipes that were in the supply chain that supposedly got replaced not too long ago. Obviously not.

 

I have reinstalled mine at least 2 times each side. I happen to have the
engine manual section on the desk and page marked to that section and all I
could find was a note about replacing the D-rings and giving them time to
return to shape. But we know that Ford won't sell just the D-rings. So that leaves
you with a choice of reuse then pipes and dummy plugs or a new set. The book
should really say reuse on condition. The limiting factor being the seal it's self.
If it looks to be free of chips and wear and other damage then reuse it. They are
easy to get at if one should goo POOF on you. At least you can pull over not like
a airplain that can't pull over do to a leaking seal.



Sean

6.0L Tech Folder

 

Ok, how do you know if your new stand pipe and dummy plug kit just bought has a good set or bad set of stand pipes? Annoying. I am having an intermittent long cold crank times. It will go is spells for weeks where it cranks for about 4 second before she fires. Then she will be fine for some time and crank for a second or 2 before she fires. I just ordered AE so I can take a closer look at things and see how pressures are building. It's just odd it seems to go in phases. My truck is a mid 2006 model. B.

 

May not even be the stand pipes or the dummy plugs.
You may find that it has not been replaced that you have
a failing STC fitting. But in most cases it starts to get worse
over time and one time no start at all.

It's all in the numbers.


Sean

6.0L Tech Folder

 

I installed the replacement stand pipe and put the air to the IPR connector and the system still won't hold pressure. I didn't hear any loud leaks but I can't hear that well so I have to get my wife out there to listen. I have already replaced the STC fitting. What could be the source of the leak? From the HPO system layout it looks like some of the seals can only be accessed by pulling the oil pan.
I purchased the truck non-running had it at the Ford Dealer and they said it needed a new HPOP and IPR they wanted close to $3000 to repair.

 

If I read you first post correctly the engine is still out? Have you primed the oil rails with oil? If there no oil in the system you very well could hear small leaks.

I am willing to bet you fixed your issue but other sources could be oil rail nipple cups and (top) injector o-rings.

 

Engine is still out and probably will be for a while. Took the body off the frame and stripped the frame down for sandblasting. Sandblaster is very busy so might be towards the end of the month before things start going back together.
No oil in the system yet and I read somewhere pressure testing the HPO system was better with no oil.
I have replaced the oil cooler, deleted the egr with the IPR kit that has outlets for coolant filters. I have new orings for the fuel injectors on the way.
I really don't want to have to work on this motor while it is in the truck.

 

When air testing did you power up the IPR valve? OTC makes a tool to close the IPR for air testing but you can use 12v dc for short periods of time.

 

This thread talks about it specifically #33. I've also read this in other threads and it makes sense to me...

https://www.ford-trucks.com/forums/1...trouble-3.html

 

I see the standpipes broken there fairly often. Just like mentioned above,, plain ol bad luck. I will crack valve covers just to update dummy plugs,, but leave stand pipes until injectors are needed. I've done countless no starts from dummy plugs,, but never had a stand pipe be the reason for a no start/hot no start. I reuse updated stand pipes all the time.

 

I am using one of the Accurate Diesel IPR Test Fittings. The IPR is removed. 6.0L High Pressure Oil System IPR Air Test Fitting

 

Thanks Yahiko. I just bought AE so I can do further diagnostics to try and pin this down further. The STC is original. I know because I am the original owner of this truck. I bought the STC kit yesterday in fact along with the dummy plug kit. I have a few more parts to buy over the next two months then I'm going to dig in and replace this stuff. B.