Pressure drop on the hot engine - Ford Powerstroke Diesel Forum
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Old 10-05-2012, 07:18 AM
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Pressure drop on the hot engine

Problem car is Ford F250 2004 Powerstroke 6.0, and it has ceased starting with its engine hot whereas when the engine is cold it still starts at once, the computer showing pressure of 900 psi (300 psi with hot engine respectively).
After starting the engine stops after a while.
We replaced the oil pump, but the problem remained. Nothing has changed.
Breakdown progresses. A month ago on the hot engine was 370 psi, now 307..
Can be a problem in the oil valve?

Sorry for the bad English.
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Old 10-05-2012, 08:20 AM
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You have a leak in the HP oil system or your low pessure oil pump is not keeping up supply to the HP oil resivoir.

You need min 500 psi to crank when you drop presssure to low while running the pcm uses a 750 psi default setting to keep the engine from dying while on the road. Once you shut it down it will not restart untill the oil cools down enough to thicken back up to where it can build the 500 psi to start.
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Old 10-07-2012, 09:26 AM
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Quote:
Originally Posted by dannyboy950 View Post
You have a leak in the HP oil system or your low pessure oil pump is not keeping up supply to the HP oil resivoir.

You need min 500 psi to crank when you drop presssure to low while running the pcm uses a 750 psi default setting to keep the engine from dying while on the road. Once you shut it down it will not restart untill the oil cools down enough to thicken back up to where it can build the 500 psi to start.
Thank you, very easy to understand.

Found a suitable video with the same engine and the problem.
for 35 - 40 seconds narrator moves the oil pipe. We have it hanging out stronger on the higher amplitude. Most likely this is a leak at the marked location.



Is there a repair kit for this damn thing? I have to google, but have not found a single detail and guidance for replacement. Thx!
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Old 10-22-2012, 05:18 AM
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That's loosely stands.

Need tube assembly (shown in blue) or just seal (in red).







I can not find this stuff on sale. In the catalog of spare parts is only tube without packing - 9T288.

Maybe what I'm looking for - receiving part - 9J332?
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