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  #1  
Old 02-02-2011, 02:02 AM
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Oil pressure problem?

ok well ive finally finished up building the stroke and getting it to somewhat run. now my problem is when i crank it it cranks n cranks n maybe will fire up. and when it does sounds fine runs good but when it goes down to a idle the oil pressure drops dramatically n the needle bobs back and forth i have a modded terminator on there now. when i do crank it takes a lil for the icp pressure to build up to 500 and when it does it will fire. i believe that is bout it any info or help would greatly be appreciated it
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  #2  
Old 02-02-2011, 02:09 PM
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Re: Oil pressure problem?

have you checked the reservoir to be sure its full of oil before you crank it??

dis this the first start up with these pumps??
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  #3  
Old 02-02-2011, 03:56 PM
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Re: Oil pressure problem?

yess i do its most of the time it is but the first couple times it wasnt
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Old 02-03-2011, 01:17 AM
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Re: Oil pressure problem?

ok well the truck seems to start alrite for now but when the truck is at a idle the oil pressure on the cluster drops down or likes to hop around? anyone ever seen such a thing?
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  #5  
Old 02-03-2011, 01:22 AM
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Re: Oil pressure problem?

the factory gauge is useless...just and idiot guage...

hook a mech gauge up and see what your LPO is really doing
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Old 02-03-2011, 01:33 AM
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Re: Oil pressure problem?

If it is a 2003 or 2004 6.0 the high pressure oil pump has a check ball in the side of it that has been know to blow out and cause this issue, what happens is when the ball falls out it drops oil pressure at idle and the gauge drops down when it's off idle the gauge works and this will also cause a hard start issue, good luck finding the check ball it is about the size of a marble and usually ends up in the oil pan
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Old 02-03-2011, 01:54 AM
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Re: Oil pressure problem?

Quote:
Originally Posted by coysdieselspecialties View Post
If it is a 2003 or 2004 6.0 the high pressure oil pump has a check ball in the side of it that has been know to blow out and cause this issue, what happens is when the ball falls out it drops oil pressure at idle and the gauge drops down when it's off idle the gauge works and this will also cause a hard start issue, good luck finding the check ball it is about the size of a marble and usually ends up in the oil pan
its an 01....7.3 tech forum...
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Old 02-03-2011, 03:44 AM
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Re: Oil pressure problem?

Oops in that case theirs a check ball by the high pressure pump that can stick
That controls low pressure oil flow it's a 3/8 drive head to get it out, also their is a non serviceable check ball in the front cover
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Old 02-03-2011, 05:22 AM
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Re: Oil pressure problem?

there is no checkvalve in the front cover
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  #10  
Old 02-04-2011, 02:24 AM
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Re: Oil pressure problem?

If u take the front cover off the front of any international 7.3 liter turbo diesel
their is a check valve make into the cover the only way to get to the valve is to cut the cover open
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  #11  
Old 02-04-2011, 02:33 AM
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Re: Oil pressure problem?

Also if u removed the oil cooler during ur bulid check the oil regulator it is built into the rear of oil cooler housing near oil filter but oil cooler must be off to get to it,some of them have a snap ring some of them are just pushed in and outer ring is pressed to hold valve in sometimes the valve can fall out during a rebuild without noticing it usually will start and die constantly if this is the case
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  #12  
Old 02-04-2011, 02:41 AM
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Re: Oil pressure problem?

Here is the check valve you referred to first.



This valve is a relief valve to protect the oil cooler from too much pressure.

And as you can see, it is in the block, not the front cover.
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  #13  
Old 02-04-2011, 02:46 AM
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Re: Oil pressure problem?

And in the oil filter head there are TWO pressure relief valves.

Here is the filter restriction bypass valve:


Located here:



Here is the actual engine oil pressure regulator:


Located in the round bore below:
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  #14  
Old 02-04-2011, 03:07 AM
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Re: Oil pressure problem?

yes thats correct but their also is one bulit into the front cover because on one case i had a truck i rebulit the motor on and the truck wouldnt build low oil pressure so first thing i checked is that pressure is the relief vavle in the block spun over oil pumped out,out so next thing i checked was the oil bypass relief vavle it all checked out,so the next thing i did was call my buddy that been a diesel tech since the powerstrokes came out he said that inside the oil passage in the front cover their is a check vavle that can stick inside the cover causing loss of low pressure oil,so i replaced front cover problem fixed thats the only time i have every seen this,i work on about 15 or 20 of them a week but its always something different,on the older international t444e this check vavle is serviceable
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  #15  
Old 02-04-2011, 03:47 AM
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Re: Oil pressure problem?

Quote:
Originally Posted by coysdieselspecialties View Post
yes thats correct but their also is one bulit into the front cover because on one case i had a truck i rebulit the motor on and the truck wouldnt build low oil pressure so first thing i checked is that pressure is the relief vavle in the block spun over oil pumped out,out so next thing i checked was the oil bypass relief vavle it all checked out,so the next thing i did was call my buddy that been a diesel tech since the powerstrokes came out he said that inside the oil passage in the front cover their is a check vavle that can stick inside the cover causing loss of low pressure oil,so i replaced front cover problem fixed thats the only time i have every seen this,i work on about 15 or 20 of them a week but its always something different,on the older international t444e this check vavle is serviceable
I stated before that there was no check valve in the front cover.... After reading your responses I had enough doubt to go out to the shop and picked up a front cover from a 96 ford f-250 7.3 powerstroke.... there is absolutely no valve of any sort in it...I can plainly see all the way through the oil passage from the cooler port to the pump port there are no other ports or restrictions of any kind.
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  #16  
Old 02-04-2011, 03:56 AM
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Re: Oil pressure problem?

Here is the port from the LPOP to the above relief valve in the block:



My front cover was soaking in Purple Power when I took the pic.

As you can see, no valve in the front cover.

Want to try again?
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