1979 Ford F-150 400 cid Normal Oil Pressure

BRYAN DOWLING

MEMBER
1979 FORD F-150
6.6L
V8
4WD
AUTOMATIC
155,000 MILES

I'm looking into a 1979 Ford F-150 (ext cab, long box 4x4 Custom) in my area and the seller has in the description that is has low oil pressure, but that maybe just a faulty gauge. At this point im not sure if its a dash gauge reading error (or related components) or if hes used a oil pressure tester. Does anyone know what the normal oil pressure range for this truck?

Millage in Km

Here's his write up.

"400 CID with low oil pressure. All cylinders were around 135psi. C6 auto works perfect with clean fluid. 4.10 gears with Danna 44 front diff(4.09), 9" limited slip rear diff(4.11) NP 205 tranfer case. Front end is tight. Tires ok. Price firm. Thanks for looking."

3 Replies

CARADIODOC

MECHANIC
33,873 POSTS

If only the oil pressure gauge is reading low, it would be due to a defective sending unit, and he would have replaced that, especially when he already has a suspect. You would do the same thing if you were selling the truck if a 20-dollar part meant you could get a few hundred more for it. You can assume since he didn't do that, or he did and it didn't solve the problem, the oil pressure really is low and it's just a matter of time before major repairs are needed. He wants you to pay for those repairs instead of himself.

Normal oil pressure is typically around 40 psi.

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Sunday, February 22nd, 2015 AT 4:34 PM

BRYAN DOWLING

MEMBER
2 POSTS

Alright thanks. I'll ask him if its just the gauge or if he actually tested it. I have access to my school shop and it could be my grade 12 project, but if its something more serious i'm not sure if its worth the money and hassle.

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Sunday, February 22nd, 2015 AT 4:42 PM

CJ MEDEVAC

MECHANIC
11,004 POSTS

MY TAKE ON THIS IS

DO YOU REALLY LOVE THE RIG?

ON A SMALL SCALE, NOTHING ELSE MATTERS (I FEEL THE SAME WAY WITH BOTH OF MY JEEPS)

RECKON HE'D LET YOU TRY THIS?

https://www.2carpros.com/questions/2001-ford-escape-oil-light-flickering-at-idle

IF NOTHING ELSE, THE SENDER MIGHT COST $10-$15, AS A "SACRIFICIAL PERMANENT TEST", RECKON HE'D LET YOU INSTALL THE SENDER, EVEN THOUGH YOU MIGHT BE DONATING $15 TO HIS CAUSE?

THIS MAY OR MAY NOT SHIFT YOU INTO THE PURCHASE, BUT WITH

TRUE LOVE INVOLVED

A $15 LOSS NOW IS BETTER'N A $1500 LOSS LATER

HECK, I NEED TO SWAY YOU INTO A CJ-THEY WILL LIVE FOREVER!

CLICK ON MY '77 AND '46 BELOW

I LOVE BOTH!

THE MEDIC

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