Fresh rebuild, no base oil pressure 2006 F350 6.0l - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 09-29-2019, 11:36 AM Thread Starter
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Fresh rebuild, no base oil pressure 2006 F350 6.0l

I have been fighting this issue for quite a few months. I even got a replacement engine that I thought would work, but turns out after I installed it, I found out it has a bad lifter on #8 so it is going to have to come out again.

I have a freshly rebuilt motor, but the person that rebuilt it didn't know what they were doing. I have been fighting with if for nearly a year now. It runs, and with the scanner I can see that there is good high pressure oil pressure. When I use a gauge on the low pressure side (not the one in the dash, but a real gauge), it shows very low (4-6psi) at idle, and about 17 psi when you bring it to 2000 RPM.

I replaced the oil pump, re-did the gaskets on the front cover, and replaced all gaskets on the oil cooler housing/filter housing and it has not changed at all. I can put my thumb on the top of the block where the oil comes from the geroter pump through the block and cannot keep it on there due to the pressure, but at the gauge I am still at very low pressure.

I am getting ready to tear down the entire block, any thoughts to what this could be? Missing piston oilers, bearing tolerances not right, galley plugs missing, something else???
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post #2 of 21 Old 09-29-2019, 11:42 AM Thread Starter
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I have done some searching and have addressed most of these, will be checking out the remainder soon, any other thoughts

Possible causes (easy things first):
Low oil level Fresh Oil, 15 quarts
Low battery voltage replaced alternator 12.7 on brand new batteries off, and 14.4v when running
Bad oil pressure switch or wiring brand new wiring harness, validated with gauge
Damaged or misaligned oil filter or aftermarket oil filter/cap (causes issues w/ anti drainback valve or filter bypass valve) new cap stock, new filter stock, new drainback valve also stock
Stuck open pressure regulator new pressure regulator stock
Inaccurate dash gauge Verified with real gauge
oil dilution (due to fuel) No dilution
Missing gallery plugs
"Early model years (03 and 04.25) - missing check valve ball in the HPOP
05 and up model years - badly leaking STC fitting on the HPOP" 2006 system
Front cover gasket leaks new gasket no leaks
Scored/damaged oil pump or front cover new front cover, new oil pump both stock, no deep grooves in cover
Restriction in the pick-up tube or oil pan
Missing bearing shell(s)
Broken or damaged piston cooling jets
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post #3 of 21 Old 09-29-2019, 11:44 AM Thread Starter
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I also can put my thumb on the turbo oil hole on the cooler cover, and it has no pressure when cranking and everything else is back together
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post #4 of 21 Old 09-29-2019, 11:57 AM
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The STC fitting is for 05, 06, and 07 trucks, not just the 05

Mark
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post #5 of 21 Old 09-29-2019, 12:57 PM Thread Starter
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STC fitting is replaced with solid, and low pressure regulator has been replaced with stock new
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post #6 of 21 Old 09-29-2019, 04:45 PM
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" I can put my thumb on the top of the block where the oil comes from the geroter pump through the block and cannot keep it on there due to the pressure, but at the gauge I am still at very low pressure."

So, building pressure there -- but losing past that point

Oil filter drain(yeah I know you said replaced)

Leak in the high pressure system taking all the oil

Do an air test at the IPR valve and report the results

In my defense, I was unsupervised
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post #7 of 21 Old 09-29-2019, 05:00 PM Thread Starter
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Brand new stand pipes, dummy plugs, branch tube, all stock, runs great, takes time to start as it is not building pressure. Used 2 or 3 different drains, no change
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post #8 of 21 Old 09-29-2019, 06:03 PM
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I understand you have put a lot of new parts on it, but....you still have a problem. Go back to basics, like you've not put on anything new. If I were you, I'd do an air test.
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post #9 of 21 Old 10-01-2019, 11:59 AM
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Im gonna go with missing block plugs.


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post #10 of 21 Old 10-01-2019, 12:23 PM Thread Starter
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There are 2 up front and 2 in the back, correct? Are there any internal galley plugs?
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