'96, Low oil pressure on idle.

TMartin · Apr 13, 2014

I hav a '96 7.3 that I jus recently rebuilt. Has approx 400 miles. When the motor is warm the oil pressure drops to 3 psi on idle. I changed the filter base yesterday as one diesel shop suggested it mite be bad. But that didn't help. Any ideas?

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ghohouston · Apr 13, 2014

Did you replace the lpop?

TMartin · Apr 13, 2014

The low pressure pump?

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ghohouston · Apr 13, 2014

TMartin · Apr 13, 2014

Yes. The only original parts on th motor anymore are the hpop, fuel pump, turbo and exhaust pipes. Is it possible to have the inner part of the lpop installed backwards? It idles fine on idle. And starts nice, most of the time. Once in awhile it'll have a hiccup when starting it.

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ghohouston · Apr 13, 2014

I've heard of them being installed backwards before, but I don't think your truck would run at all if that were the case

spongebob915 · Apr 13, 2014

Rear oil gallery plugs.

ghohouston · Apr 13, 2014

spongebob915 said:
Rear oil gallery plugs.

Youre the one who left them out and had same problem right?

spongebob915 · Apr 13, 2014

ghohouston said:
Youre the one who left them out and had same problem right?

The machine shop and engine builder left them out. But Yes I had one missing..

ghohouston · Apr 13, 2014

Wasn't trying to undermine you with what I said, was just wondering because I remembered a recent thread about that.

spongebob915 · Apr 13, 2014

No biggie.

But it sounds like your having the same issue I did. When cold I had 40+ psi oil pressure and once hot maybe 5psi.

TMartin · Apr 13, 2014

When I had the heads at machine shop he did strip everything off. But he put all th parts in a bag n I'm pretty sure I emptied the bags. Where are the rear oil gallery plugs? That's a new one to me...

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spongebob915 · Apr 13, 2014

TMartin said:
When I had the heads at machine shop he did strip everything off. But he put all th parts in a bag n I'm pretty sure I emptied the bags. Where are the rear oil gallery plugs? That's a new one to me...

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in the block behind rear cover

TMartin · Apr 13, 2014

The plugs beside the cam shaft?

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spongebob915 · Apr 13, 2014

TMartin said:
The plugs beside the cam shaft?

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Yes see how one is not there on the right side

TMartin · Apr 13, 2014

Yea I see that. Looks like a large project to undertake...

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TMartin · Apr 13, 2014

But I guess u gotta do wat it takes!!

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spongebob915 · Apr 13, 2014

Yea h you need to pull the transmission and rear cover .

But if the person/shop that built my engine would stand behind his work I would not have to do it myself. Was told the first day I picked up my truck and saw my oil pressure gauge reading zero " DONT WORRY ABOUT THAT GAUGE MY TRUCK DOES THE SAME THING"
They forgot to remove a gauge and hose on the oil filter housing that they must have been using to check the oil pressure and realized something was wrong. But instead of doing the right thing they gave me my truck. I was never convinced that he was correct or telling me the truth . So after some research I found a thread with the same symptoms my truck had. So I haD the trans removed and found the problem.

TMartin · Apr 13, 2014

I did most of the work myself. So it's my problem I guess. But I didn't take them out. Prolly my machine shop did. I hav a gauge connected rite at the filter and that's how I keep track. Pullin a trans ain't that hard tho.

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