Yeah... that should have been a gawd-awful mess if you cranked with the HPOP reservoir top off. I feel your pain - I have an engine on the stand with a Melling, an oil pickup seal, and a Moroso oil pan in a box. If you're lucky, it's no worse than an oil pump seal - you don't have to drop the engine for that. Is the coolant clean? The oil cooler is another external part that can be addressed without dropping the engine. Don't overlook that bypass next to the oil filter.

I really wish we could bench-burn these beasts before install.

 

I will share the extent of my knowledge that I gained from my HPOP experiences from my threat that I assume you read completely since you posted in it asking for help.

I have a hard time seeing the checkball ever being an issue unless the spring is broken or the ball is damaged. I could not figure out how to replace the seal under the ball. Also a bad check ball will not let the HPOP res to completely drain.

The only thing that I could see that would allow the HPOP res to completely drain was the front seal. I studied the oil flow paths and except for a crack in housing only the seal will let the oil COMPLETELY drain from the reservoir. There are other paths that the oil could drain from, but they will stop draining after reaching a certain level. I had to watch the seal to see the small oil trail at the bottom of the seal.

 

I would agree. If you add a quart of oil to the Reservoir and it slowly drains wouldn't that isolate the problem to the HPOP and reservoir area?

JT250,

Can you elaborate on the seal issue you had please? I still don't understand how the green seal on the HPOP was causing your reservoir to drain below the seal itself. Not doubting it was the problem, just want to understand it.

And as far as the oil pressure regulator, I found some good info with pics at this site in case anyone is interested.

Low Pressure Oil system - Ford Diesel Power Forums

 

^^^This aint the post with the HPOP seal that pushed out Buddy. Read again

 

I have to question the statement about "unfiltered oil" coming from the oil pan. Other than the oil draining from the top end/heads, the last place that the majority of the engine oil goes through is the oil filter as it returns to the pan. If it is dirty at that point I would say that a new filter is in order.

 

Yes, I realize that. This is why I addressed the question to JT250 and not the OP. Maybe I should have asked it in his thread but it's pretty old.
If so, my bad.

 

I would say you asking in the proper thread. My problem was that I would lose all the oil in my reservoir. After looking at tall the oil paths, I determined that the only possible cause was either a crack somewhere or the front seal.

The oil leaked out of the front, round green seal (that sits behind the HPOP bolt) at the lowest part on the seal. This is lower than the lowest point in the reservoir. My seal had worked its way about half way out. You can see pics of this in my original thread.

I sent my pump back to TE and he fixed it for me. That was indeed my problem because I haven't had any problems with it since.

 

So I pulled oil Cooler and replaced oil filter adapter housing and Oil filter and it had no effect. Cranked untill ****ty batteries died and only got a girgle out of it with LPOP res cover still off.

Moved on to the LPOP but I just cant see that being the issue. It a melling with less than 500 miles on it but Im gonna swap it out anyways. I got the balencer bolt out thn realized my puller was not here so back at it tomorrow.

 

Did you see this donor engine running? When you get the oil pump off take some pics of the pump and front cover area where the pump and cover mate and post them here. If there is a groove it will have problems building pressure.

Some members have had success in diagnosing oil pick up tube problems by adding an additional 3qts of oil and jacking the rear of the truck up. Then see if it starts pumping oil.

 

That is a genius idea for checking the pickup tube. This lack of oil in the HPOP reservoir has all the marks of a pickup tube problem.

There is a threaded plug in the block adjacent to the oil filter that can be removed for checking LPOP oil pressure. I think I have seen Rich (Tugly) or someone else post a picture of the correct plug to remove. It is often used for bypass filtering as well.
Larry

 

99 7.3

No LP oil getting to reservoir.
New LPOP.

Bad front cover?
I can feel a small scour but bad enough to cause no pressure?

Grasping at straws here.

 

Check your oil cooler check valve. PM (BBslider) he had the exact problem ask him what he did to fix it.

 

Dont know how to ask people questions off thread