oil pressure problem
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Freshman User
Joined: Sep 2003
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oil pressure problem
my truck started showing low/no oil pressure on the stock gauge so I parked it till I could look further into it. I started today to install a oil pressure gauge That I picked up to make sure I was getting an accurate reading. I didn't realize this was going to be a major project. I could barely get a hand on the sending unit let alone get a wrench in there to get it out. So I had to remove the power steering pump and air conditioning compressor to gain access. Once I removed the sending unit there was no oil that came out of the hole. I expected there to be oil coming out since I didn't drain it. I have a feeling this is a bad sign. Anyone want to give me an idea what the problem might be. I didn't get the new gauge installed yet.
oh by the way, this is an 89 f-250 351.
oh by the way, this is an 89 f-250 351.
Senior User
Joined: Oct 2006
Posts: 332
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From: SE of Bennett Colorado
The oil 'sits' in the pan. The 'pressure' (engine running) provides a reading for the gauge. The stock gauges are totally inaccurate. Put a mechanical sending unit on, check you oil levels, then start it up. Check for oil leaks (rear seal, oil pan, valve covers, lower intake, etc) Let us know what happens next.
Elder User
Joined: Sep 2005
Posts: 841
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From: Orangeville, Ontario
Like Grizz said, the stock gauge is worthless. Mine read below the low-side (pegged) and once I installed my mechanical gauge I could actually see that I had near perfect oil psi. Make sure you use teflon tape on the fittings for the gauge. I also had to remove all that stuff when installing mine, sure made it alot easier. As far as gaskets leaking and such that won't affect the oil pressure.. just the oil level (not sure if that was what you were getting at grizz).
Once you do get that new gauge installed..
50-60psi cold idle
20ish psi at warm idle
10psi per 1000 rpm after that
If your not in these parameters try bumping up a grade in oil for a semi-fix. Or just add some Lucas, it's always worked wonders for me.
Once you do get that new gauge installed..
50-60psi cold idle
20ish psi at warm idle
10psi per 1000 rpm after that
If your not in these parameters try bumping up a grade in oil for a semi-fix. Or just add some Lucas, it's always worked wonders for me.
Senior User
Joined: Oct 2006
Posts: 332
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From: SE of Bennett Colorado
Yes RoadVirus, that's what I meant in regards to 'other leaks; gaskets and what-not(I should have made it clear for him).
You never know, the worthless stock gauge just may be telling the truth (doubt it though) and the truck sprung a leak. Diffinitely put the mechanical gauge on first, then let the truck warm up. Take it for a short but meaningful drive, watch your new gauge in total awe, then park it and lay underneath the truck and cross your fingers. If you have leak, the mechanical guage will let you know by the accurate falling of the oil pressure.
I just did my oil pan for the SECOND time (I screwed it up putting it back up on the rear seal job-oops). I finally have the pressures you listed. Nice listing by the way; I never have seen the pressures listed like that.
Eric
You never know, the worthless stock gauge just may be telling the truth (doubt it though) and the truck sprung a leak. Diffinitely put the mechanical gauge on first, then let the truck warm up. Take it for a short but meaningful drive, watch your new gauge in total awe, then park it and lay underneath the truck and cross your fingers. If you have leak, the mechanical guage will let you know by the accurate falling of the oil pressure.
I just did my oil pan for the SECOND time (I screwed it up putting it back up on the rear seal job-oops). I finally have the pressures you listed. Nice listing by the way; I never have seen the pressures listed like that.
Eric
Elder User
Joined: Sep 2005
Posts: 841
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From: Orangeville, Ontario
Lol, I'm not 100% sure, but what I was trying to say is as far as leaks go they don't affect your oil psi.. unless the leak is so bad you ain't got no oil! As far as I know personally anyways. If it was me I'd cross my fingers after the first time you start it with the mechanical hooked up 
. I've got a leaking intake manifold and rear main at the moment and it hasn't affected my psi.. at least not that I know of.
Thanks for the compliment, btw. I picked that up off someone else on here.. it's pretty much just a general guideline.
. I've got a leaking intake manifold and rear main at the moment and it hasn't affected my psi.. at least not that I know of.Thanks for the compliment, btw. I picked that up off someone else on here.. it's pretty much just a general guideline.
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