Low base oil pressure

Paul Owner Tyrone, Georgia Posted   Latest  

Vehicle was brought to me for low base oil pressure. Manually checked oil pressure 7psi at idle. Pulled non OEM filter and found no oil in housing. Replaced drain back valve (OEM),and OEM filter and cap. Oil now holds in housing. No change in base oil pressure. Customer (a friend), wanted to pull oil pump for inspection. Oil pump and cover looked good, since we were in there, customer wanted to replace pump, and relief valve (OEM). As expected, no change. I told the customer from the beginning I didn't have much hope for this engine. It has other issues, #4 hole is dead per power balance, and long cranking times. Relative compression test looked good, so I'm sure it has a high pressure oil leak, along with a possible bad injector. So my question is this, has anyone ever experienced a high pressure leak so bad that it causes a base oil pressure problem. I'm not going to tear this down to check bearing wear. I've pretty much already written it off.

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Caleb Technician
Mishawaka, Indiana
Caleb Default
 

I assume your talking about a Ford 6.0 Powerjoke engine. However there is no vehicle info in your post.

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Paul Owner
Tyrone, Georgia
Paul Default
 

Yes. I put all that in including the VIN. Not sure what happened to it. 2004 F550 6.0l 244,000 miles. 1FDAW56P94EB09906

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Rusty Owner/Technician
Oakham, Massachusetts
Rusty Default
   

A HP leak won’t affect base oil pressure. The lube pump supplies oil to a reservoir where it’s picked up by the HPOP. Were there little needle imprints in the pump gears? That’s a tell-tale sign of roller lifter & camshaft failure. Write it off.

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Mike Instructor
Fresno, California
Mike Default
 

It will it's if a catastrophic leak like the HPOP oil pump casting ruptures.

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Rusty Owner/Technician
Oakham, Massachusetts
Rusty Default
 

Thanks. I never knew that. 😔

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Mike Instructor
Fresno, California
Mike Default
 

HI Paul, If you want to isolate the low side from the high side, we pull the standpipe out of the oil filter housing. Send me an email and I will give you the procedure for how to do this. Too lengthy to type here. If anyone else wants the info, send me an email as well. …

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Gail Technician
Garner, North Carolina
Gail Default
 

Plus if you remove the oil filter the reservoir is supposed to drain. I wonder is it has an aftermarket oil filter cap? The 04 was a bit of an odd ball. Where is the ICP, on HP pump or right valve cover?

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Paul Owner
Tyrone, Georgia
Paul Default
 

Cap, filter and drain back valve were replaced with OEM

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Paul Owner
Tyrone, Georgia
Paul Default
 

Email sent

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Gail Technician
Garner, North Carolina
Gail Default
 

The ball bearing is on bottom of pump. See the arrow at bottom of diagram. These pumps had high failure rate.

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Tanner Instructor
Wellford, South Carolina
Tanner Default
 

Given the year of this one it should have the early design high pressure oil pump. There was a ball bearing that was pressed into The high pressure pump and then staked to plug a hole. If that ball falls out you will have the condition you are describing. Pull the high pressure pump and inspect it.

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Gail Technician
Garner, North Carolina
Gail Default
 

Exactly what i was thinking.

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Paul Owner
Tyrone, Georgia
Paul Default
 

Will do Thank you sir

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Paul Owner
Tyrone, Georgia
Paul Update
 

Sorry it took so long to repy. Thanks to all who contributed. as you can see in the photo Tanner was dead on. Base oil pressure has been restored, and of course cranking time is back to normal.

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Mike Instructor
Fresno, California
Mike Default
 

Glad to see you got this one resolved!

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