Oil pressure - 5200

paul

Well-known Member
I have a 5200 Ford, '75. Diesel.

The oil idiot light started glowing dimly. Then it would be off for a minute at start up, then be on steady and bright constant. This all in in less than an hour of operation....

Well. That ain't good.

So I took out the sensor and screwed in a 1/4 inch pressure gauge from napa, 0-60psi.

Started up the tractor, and it shows at least 50 at idle, and goes beyond 60 at half throttle.

Holy cow.

I didn't think there was anywhere near that pressure on a well worn old engine? I just had the clutch and parts of the rear end gone through this spring, but the engine is kinda old...

So, does this make sense, or what? I'll run the engine longer and see if the pressure goes down when it warms up, but I wasn't expecting that high a pressure, just glad there is some tho!

I've had troubles with the instrument panel, (gone through three new ones in a couple hours each, the hour meter still doesn't work, and the wiring harness was melted together, had that replaced). So, I was skeptical of the oil light, is why I tried the direct gauge.

I was hoping I didnt have zero oil pressure, but getting 50 plus is a surprise to me as well......

Paul
 
The oil light on my 4600 came on a number of years ago, maybe 5-6000 hours at the time. Shut it down and called the dealer. First thing he did was pull the sender and try a gauge. 60#. New sender and back to the farm. They have a good oiling system.
 
agreed. when i got my 4600 the oil sender was flaky and leaked, gauge showed much the same as you say. as I recapp the sender was 8$ ?? at CNH
 
Change the sender. They're only like 10 bucks anyway. If that doesn't work start chasing the wire for a ground. The pressure is obviously fine.

Rod
 
Agree with others, most likely the oil pressure switch.

Having said that, never test oil pressure with the engine cold and pronounce everything OK. Good pressure with the oil cold doesn't mean much. Hot idle is the best point to test oil pressure. Anything above 15 PSI should be OK.
 
What I assumed.

I've never been an engine guy, make it up as I go.... And dont want to play with oil pressures when such good resources are at my fingertips.

Good point with the hot and cold situation, understand that. I'll leave the gauge in for a while and see where the pressure settles out with a little time behind it.

Now, if NH gets rid of their bad batch of gauge clusters, so maybe my 4th one will work..... Seems they got messy with the glue and messed up the hour meter wheels, stick and strip.....

Paul
 
Ran it for 20 minutes, wasn't pulling anything but the oil pan was pretty warm to the touch. Was still 50+ lbs at idle and pegged at 3/4 throttle. This isn't like it was plowing hot, but at least warmed up well.

Good to go, grab a sender unit when I'm bar a dealer.

Paul
 

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