3FE Oil Pressure

What is your 3FE oil pressure reading usually at?


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Joined
Sep 15, 2004
Messages
2,190
Location
Western Slope, CO
I am wondering, amoung 3FE FJ80 owners, where does your oil pressure sit at while at highway speeds with the stock gage.

High mark
upper middle mark
lower middle mark
low mark

Also, has anyone put a mechanical gage on to check the psi reading?
 
Last edited:
Joined
Oct 26, 2004
Messages
139
Location
Michigan
Mine is just above the lower middle (like less than the width of the line itself) and right on the line once warm. It doesn't move more than a sixteenth of an inch either way under any conditions. I don't think these gauge is very precise.
 
Joined
Sep 15, 2004
Messages
2,190
Location
Western Slope, CO
Thanks fellas for all the input. I'm in the same boat as the people with the indicator on the middle lower mark.
For the people with higher pressure I would say they have really tight tolerances or the sending unit is a touch sensative.

I'm coming off a fresh rebuild with 2800 miles so far. The engine started to develop a knock and the pressure dropped below normal, enough for my heart to go into cardiac arrest. So I towed the 80 home and dropped the pan. Low and behold I found number 3 connecting rod bearing scared up. All the rest were in good condition. Just for a safety meassure I'm also going to pull any mains I can and check their condition.

Here's a pic for detail.
bearing.JPG
 

Aggiesdm

***** Regular
Joined
Apr 6, 2013
Messages
1,009
Location
San Antonio, TX
Like PFMFJ80 above, mine lives at around 1/4 of the gauge, but I’m pretty positive its just a worn sending unit. It’s been like that for 4 years of ownership and I’ve never had any issues associated with low pressure.
 
Joined
Feb 13, 2007
Messages
222
Location
Fort Worth, TX
Mine is near the bottom at idle but goes up just past the low middle mark at RPM. I've noticed that this improves every time I change the oil. New oil gives me better pressure values for a while.

I don't really trust the gauge in terms of 'actual' pressure and only use it as a 'reference only' gauge. Is there a standard solution for an aftermarket gauge that will give actual pressure numbers?
 
Joined
Feb 8, 2018
Messages
47
Location
Big Rapids Mi
Mine sits right below 1/4 at driving speed, it sounds like this is normal considering 225k... If I am wrong let me know, cause I may need to fix something before I take it on a 3k mile trip LOL
 

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