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  #1  
Old 11-08-2012, 11:04 AM
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No Low Pressure Oil Pressure

Hi there,

2005 F350 XL SuperDuty 6.0L Turbo Diesel

Truck came in on the hook with a no start condition.
Had very low ICP(Approx. 1500-2000kPa/217-290PSI) and then after a while of cranking had none. Bench tested the IPR and replaced the screen and o-ring. Checked the oil filter and noticed no oil in the housing. Pushed down the black valve and had someone crank it and got no oil. Pulled the oil pressure sensor and hooked up a gauge and it barely came off 0 when cranking. Checked the LPOP and the gerotors were within clearance tolerance. Only thing I found odd was play between the inner gerotor and crank. Used a tube and dum-dum to try and pump some oil from the oil pickup cavity in the LPOP and got nothing but air when pumping slowly and very aerated oil pumping fast. Pulled the pan and checked the oil pickup. The pickup was fully intact. The problem was the o-ring was only being half squished letting air in. Upon further examination, I noticed that the inset ring housing the o-ring on the bedpan was not flat, but angled on a slant.

Now to the questions I have.
First question: Is the inner gerotor to crank supposed to have play? I can turn it approx. 3-5 degrees back and forth.
Second Question: When the oil pickup is fully tightened down, only half of the o-ring is being squished. Has anyone ever seen the bedpan o-ring inset angled?

Thanks in advance for any help you can provide.

Last edited by Rehs; 11-09-2012 at 07:30 AM.
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  #2  
Old 11-08-2012, 01:04 PM
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Personally I have never found that much play on the crank flats.
No I have never noticed the pick-up haveing a bevel.

I suggest talking to a engine rebuild shop what the specs are for the 6.0 in the areas of your concern.
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Old 11-09-2012, 07:50 AM
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Yeah, it's weird. The mating surface for the pickup flange is level and flat, but the inset for the o-ring is slanted on an angle from the front of the engine to the back. It's like when they machined it, the mill head was on an angle. Talked to some Ford mechanics and they said the inner gerotor should have very little to no play. New gerotors are on order. I'll see if that takes up the play. Thanks for your input Dannyboy950.
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Old 11-11-2012, 06:52 PM
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Check the HPOP. Probably blew the check valve out the side and you're just pumping oil without building pressure.


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Old 11-12-2012, 01:39 PM
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I thought about that, but wouldn't oil still be pumping in to the oil filter housing before making it's way to the hpop?
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Old 11-12-2012, 02:06 PM
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Quote:
Originally Posted by Rehs View Post
I thought about that, but wouldn't oil still be pumping in to the oil filter housing before making it's way to the hpop?
The filter housing would fill up if it was an HPOP problem..
An excerpt from the coffeetable book describing the flow path:

Quote:
Oil is drawn from the oil pan through the
pick-up tube to the gerotor oil pump.
The oil pressure is regulated to 75 psi via
the oil pressure regulator relieving excessive
oil pressure to the inlet of the oil pump.
From the oil pump, oil is directed to the oil
cooler and then the to the oil filter.
From the oil filter the oil is supplied to four
(4) passages. One is to the turbocharger for
lubrication and VGT control via an external
line.
The oil also is provided to the oil reservoir
that supplies the high pressure oil pump.
The two (2) other passages are to the tappet
oil feed on the right and left banks. The
tappet galleries also provide oil to the piston
cooling jets.
Cross drillings off of the right bank tappet
gallery feed the cam bearings, then the
crankshaft main bearings.
The crankshaft has cross drillings in it to
direct oil to each of connecting rod bearings
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Old 11-13-2012, 04:28 AM
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Have you pulled the pressure regulator to check?


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Old 11-13-2012, 10:34 AM
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I did that before pulling apart the oil pump and it wasn't sludged up. It didn't appear to be sticking. I believe I found the answer. It was a combination of the oil pickup o-ring recess in the upper pan wasn't originally machined properly and upon remove it, found the the upper oil pan to block gasket/o-ring was not sealing properly where it feeds the oil pump. It was completely flat and in and around the oil pump o-ring section, there was a large build-up of grime. I'll be trying to fire it up today, so I'll let you know how it goes.
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Old 11-13-2012, 05:23 PM
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I JUST had a big post on this issue!
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  #10  
Old 11-14-2012, 07:37 AM
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Still won't fire. I have Low pressure oil pressure now though. Oil filter housing is filling up and the oil pressure switch is making the gauge come up pretty quick. Back to where I started now. HPOP only pressurizing high pressure to 2300kPa after a good 10secs of cranking and then leaking down pretty quick. Hmmm... ICP leak... I guess it's time to pull the turbo, inspect the HPOP and the rest of the high pressure system.
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