Proper oil pressure
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Senior User
Joined: Sep 2007
Posts: 248
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From: Beldenville, WI
Proper oil pressure
Just got the factory oil pressure gauge working on my '66 F250 and wondering if it's reading a correct signal. Motor has about 100,000 on it and the pressure is showing about 30psi when cold and about 20psi when warm. I'm using 20w-50 oil. Is this about what I should see under these conditions or is the gauge and/or the switch possibly faulty...or are my main bearings starting to show their age?? TIA
Elder User
Joined: Mar 2008
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From: darrington wash
is this the 64 y-block or one of the 66's
normal oil preasure for a 61-61 y block is 35-55 pounds i belive
352 isthe same [35-55]
the 390 is 35-60
and i dont know anout the rest, could be a bad gadge, messed up sender, or something serious...
normal oil preasure for a 61-61 y block is 35-55 pounds i belive
352 isthe same [35-55]
the 390 is 35-60
and i dont know anout the rest, could be a bad gadge, messed up sender, or something serious...
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Payner, That is about right for a FE with 100,000 miles running 20W50 oil.
The way these engines flow the oil, it is more concern to keep oil in it than be overly concerned about the pressure. IMHO
John
The way these engines flow the oil, it is more concern to keep oil in it than be overly concerned about the pressure. IMHO
John
Elder User
Joined: Mar 2008
Posts: 978
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From: darrington wash
thatnumbers iposted are just what my 61-71 truck repair manual says
Logistics Pro
Joined: Oct 2005
Posts: 3,785
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From: Mddl A MexCans
and about 60/75 cold at 1500-2200rpm where the stock gauge never brakes 35psi so there is no doubt it is not quite on the $$ LOL
Elder User
Joined: May 2005
Posts: 581
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From: Montana
if you're still showing that kind of oil pressure at 100,000 miles then i would say that your engine is in fine condition. and maybe a litle above normal at that age. these engines weren't real reliable after 80,000 miles. Dutch
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New User
Joined: Nov 2002
Posts: 5
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From: West Fargo USA
My truck has 90000 on it and it never goes past the center. I forget now what than number is but its less than thirty psi. When warm at idle in slow traffic it drops off to nothing but the light never comes on. I have never checked it with a mechanical gauge. Been this way for seven years now so its normal.
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