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Old 06-02-2010, 10:57 PM   #1
Fixinitmyself
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Cranks but won't start. No Oil Pressure

Hi Guys, As my user name implies I am Fixin It Myself. I have enjoyed reading lots and lots of threads and have learned alot. When I get my truck running again, I will post a detailed story of all my problems and what I did to fix them.

Briefly...
ICP sensor and harness fixed under warrenty.
Two injectors .... out of warrenty.
Alternator and Waterpump within 2 weeks of each other.
Intermitant computer crashing. Found wires on ICP sensor harness shorting together.. poor repair job by dealer.



My latest problem is I don't have any oil pressure. I removed the test port on the front of the oil cooler to connect a pressure gauge. After a few trips to the store, I finally got all the correct fittings. Before I connected the gauge, I cranked the engine to see if I was getting any oil.. got none.

So now where do I look and how do I get there?

I'm suspecting the oil pickup tube or pressure regulator. There isn't much else that could fail. Has anybody used a tiny camera to look up the oil drain hole? If I had a camera would I be able to see the pickup tube?

Any suggestions would be greatly appreciated.
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Old 06-03-2010, 12:03 AM   #2
hhrecovery
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what year truck??
Did it just happen out of the blue or break down?
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Old 06-03-2010, 12:25 AM   #3
Fixinitmyself
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Its a 2003 6.0. It broke down shortly after waterpump change.
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Old 06-03-2010, 02:55 AM   #4
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How does the Lpop gears and housing look?
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Old 06-03-2010, 03:52 AM   #5
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Check to see if you are holding oil pressure in the oil rail that feed the injectors.
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Old 06-03-2010, 05:12 AM   #6
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After much studying of pictures and diagrams, I plan on pulling the lube oil pressure regulator because its simple and easy to get out. If all ok there, I will go after the lube oil pump. It looks like the fan and harmonic balancer pully have to come off to get to the oil pump. Typically what goes wrong on the oil pump? After both of these checkout, the only thing left is the oil sump pickup tube. To get the oil pan off does the engine need to be raised? Is there a trick to raising the engine off its mounts? Is there a way to test to see if the sump is clear without pulling the pan? Maybe blowing down the pickup tube when the pump is removed and hear bubbles in the oil pan. Might have to rig up something for this. If I get that far I'll take pictures.

Why would there be residual oil pressure in the high pressure oil rail? I would think that the pressure would be long gone if I was trying to start the engine. With no lube oil getting to the filter, the high pressure reservoir wont get any oil either.

Its late... more fun tomorrow.
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Old 06-03-2010, 01:05 PM   #7
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The low pressure pump rides against the aluminum front engine cover housing.that was a mistake by international in my eyes.if trash made its way to the pump,or the pump flat out failed,expect to at least replace the pump,pump cover,and front engine cover.hopefully you didn't lose a lifter or anything,then you're looking at a full build.you're on the right track with checking the regulator first,i haven't heard of too many failures of the reg. but you gotta start simple.
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Old 06-03-2010, 09:38 PM   #8
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On the '03-04 trucks the ball on the side of the H.P. pump can blow out causing loss of base oil pressure.
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Old 06-05-2010, 05:39 AM   #9
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Here is an Update,

I pulled the lube oil pressure regulator and found no evidence of a pump malfunction. Nothing but clean oil came out.

I then looked into the oil filter housing and it was empty. I then cranked the engine for 10-15 seconds and got fresh oil in the filter housing. I suspect that the oil drain in the bottom of the filter housing is stuck open.

Does anyone know the exact path and in what order the oil takes once it leaves the oil pump? I know it goes to the oil cooler and the oil filter but in what order? Also, where does the temp sensor, pressure switch and test port connect into the oil passages?

I tried blowing air into the test port and it came out in the filter housing. This leads me to believe that the passages are clear. I will try blowing air in other places to see what happens.

I wont be working on my truck tomorrow (Saturday) because its my birthday and we are going to the lake for a BBQ and water skiing.
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Old 06-05-2010, 03:21 PM   #10
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http://dan.prxy.org/truck/6L_bible_h.../Page_022.html

You aren't using aftermarket oil filters are you? Some are the wrong size and will not close the drain valve.
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Last edited by bismic; 06-05-2010 at 03:25 PM.
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