Chasing High Pressure Oil Leaks

[delmer]

I am working on a 2005 6.0 PS. We Have the HPOP off and the branch tube blocked off where the pump connects. I have been chasing high Pressure oil leaks on this thing for a while. When i put the rails on and pressurize with shop air I can hear leaking at some of the injectors. Then I hooked up my oil dispensing pump and pressurized it with that. It did not seem to leak too bad with that. And now when I hook the air back up there are no leaks. Does it take some oil to seal them up?

[dannyboy950]

Any leak is too much leak. It may be little today but big tomorrow. Just replace all the o-rings they are not that much.

[a2elvis]

Is it a no start hot?

[sinner6.0L]

yes it does take oil to fully seal up the injector inlets.

Have you checked your stand pipes and dummy plugs? Early 05s will have 04 style standpipes and plugs (1/2" drive). The 1/2" drive plugs are not usually known to fail but the 10mm hex drive plugs are.

[southend]

The air test is generally for large leaks, 120psi shop air is no comparison to the 500 - 3000psi oil pressure.........

Sent from my phone that somebody didn't help me get.

[sinner6.0L]

Agreed, unless you have a leak big enough to cause a no start an air test may not be helpful to you. Once all the oil is gone from the high pressure system you may have air leaking from every o-ring around.

[bigric]

Originally Posted by sinner6.0L

Have you checked your stand pipes and dummy plugs? Early 05s will have 04 style standpipes and plugs (1/2" drive). The 1/2" drive plugs are not usually known to fail but the 10mm hex drive plugs are.

Is there an easy external way to check early/late 05, say by serial number? I'm chasing a hard warm start problem myself and am suspecting dummy plugs/standpipes.

[southend]

Originally Posted by bigric

Is there an easy external way to check early/late 05, say by serial number? I'm chasing a hard warm start problem myself and am suspecting dummy plugs/standpipes.

This is the first thing you should do........Write Up: Monitoring the 6.0L PSD.

You can google hpop air test. You are on the right track.

Sent from my phone that somebody didn't help me get.

[bigric]

Thanks; I've got all the key monitoring except fuel pressure in place and am tracking ICP and IPR values when I'm having trouble. I've got my own thread that I need to collect more data for, but his comment intrigued me. And I do need to do the air test.

[sinner6.0L]

look at your door sticker. chances are if the vehicle was built in mid to late 04 then it still has the 04 style standpipes and dummy plugs.

If it was built a couple months into 05 then for sure you have the later style 10mm dummy plugs

I don't know for sure when the switch over was. There's a couple months where it could go either way