Oil Psi
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Oil Psi
Hi guys, I'm working on a 04 6.0 in an ambulance at work and the oil psi gauge reads nothing, even when I gave it a little throttle driving into the building. It also has an extended crank time. When going to replace oil psi switch I seen the wire was rubbed some so I repaired the wire and also replaced the switch. Started engine which still had extended crank and gauge still showed nothing at idle. If I rev it to 1000 rpm it then goes to normal range. My thought is that it must have oil psi if it stays running right? Cause you would need lpo to get hpo correct? I know that it only needs like 7-7.5 psi to operate switch, should I check with mechanical gauge at port that switch goes into? If so what should psi readings be while cranking and at idle?
Thanks guys!
Thanks guys!
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
You are correct that you must have LPO to have HPO and keep the engine running. If you already replaced the sending oil sending unit did you also replace the plug? The gauge is nothing but an idiot light with a needle. It really doesn't show any kind of pressure, only that you have pressure. Also, are you running a factory filter and cap?
Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
Here is a link to the 6.0L bible in the tech folder, it shows the location of the LPO test port, Page 24: Lubrication System
Lead Driver
Joined: Jul 2004
Posts: 6,950
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From: Foothills, CA
Next easiest thing to do would be put in a known to be Factory oil filter (it can be hard to tell on a used one).
Do you do the servicing on this unit, or just repairs? Probably should have started with that and any info on when it started acting up. For example if it was just after an oil change it would tell us the wrong oil filter (too short) is likely in there.
Do you do the servicing on this unit, or just repairs? Probably should have started with that and any info on when it started acting up. For example if it was just after an oil change it would tell us the wrong oil filter (too short) is likely in there.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Two things sticking low pressure regulator or a bad low pressure pump
or front cover damage.
After you verify the filter is correct then the next step is to
pull the regulator and clean it and retest. If you have to go into the
pump your going to need some special tools to reinstall the seal for the crank.
There is a third thing but it's rare. Tired bearings.
Sean
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Don't normally see this vehicle, I work for a Freightliner dealership and this was a service vehicle for a fleet in which we work on there semi's so they brought it to us. Of course I got stuck on it just for the fact that I own a powerstroke haha. Got an oil filter and cap from Ford and it still had the same psi readings. After that the boss said put it back together it's not are territory, they can bring it to Ford. Which I was fine with cause its and old ambulance and man that dang thing is stuffed in there. Thanks for the help guys!
Lead Driver
Joined: Oct 2010
Posts: 5,420
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From: Ouray, CO
Something like this:
|| issue || 2003 || 2004 || 2005 || 2006 || 2007 ||
| ball in HPOP | falls out | fixed || n/a | n/a | n/a |
| EGR cooler | square - strong | round - less strong | round - less strong | round - less strong | round - less strong |
| Water Pump blades | plastic | metal | metal | metal | metal |
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Thanks for the psi readings, I've been trying to find that in a post on here. Called ford yesterday and that a**hole had the nerve to tell me he couldnt give me the info.
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