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EFV-8 Club Forum / General Trucks Discussion / 0il pressure ??

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02-07-2019 @ 4:13 PM
Posts: 680
Joined: Oct 2009
sound like the oil pump screen is clogged or the relief valve on the side of the pump is stuck open. also did you change the fuel pump, maybe to electric? if the fuel pump push rod was removed that can cause low oil pressure. I have cleaned the screen by filling engine with kerosene and let it soak for overnight, have also used a blower heater to heat up the oil pan to loosen the sludge, any chance it has the truck clean out bottom plate? if so remove an clean sludge

04-05-2019 @ 12:07 AM
Posts: 2
Joined: Apr 2019
which oil filter do you use? and when do you change it means how long do you use one filter? I had faced this problem in a towing truck of 24 Hour Towing in New York, but after discussing with someone on a forum he suggested me to change the filter this is how I got the solution.

04-15-2019 @ 5:00 PM
Posts: 13
Joined: Jul 2018
Well, Just a little up date here. After 2 months or more, Put my truck in the hospital for a heart transplant.
for a truck that ran almost like a new one it did have some issues.
like the block was cracked in several places. no leakage anywhere. it had 3 different kind of lifters in it, different kinds of valves, 1 cracked head, the reason for low oil pressure? Who knows. Everything was rebuilt back with all new parts. purrs like a kitten now, with 50 pounds oil pressure.
Thanks to all for your help and suggestions.

04-15-2019 @ 5:08 PM
Posts: 13
Joined: Jul 2018
one more thing, my 1950 f-1 v-8 has a 4 speed transmission. would a 3-speed floor shift bolt up without any modifications ? Thanks in advance.

04-30-2019 @ 6:11 PM
Posts: 571
Joined: Oct 2009
This is a related oil pressure question.

I had a NOS oil pressure sending unit in my rebuilt '53 engine ('51 truck). My dash gauge always showed 50 psi after I rebuilt the engine. The NOS sending unit failed. I ordered a new sending unit from Carpenter. The dash gauge read 30 psi. Got another new sending unit from Carpenter. Dash gauge shows 30 psi. Checked oil pressure with a mechanical gauge and got 50 psi. Of course Carpenter knows nothing. Any ideas why the new sending unit only shows 30 psi at the dash gauge?


05-01-2019 @ 9:34 AM
Posts: 6036
Joined: Oct 2009
Richard, I suspect that the reproduction sending unit is the variable resister type and not the King Seeley type. If you have the NOS one (check for KS stamped into the cover to make sure that it is the correct one), it can be repaired by one of the people that advertise in Hemmings. Bob's Speedometer may be able to do it.

See this E-Bay item for the stamp



05-07-2019 @ 8:43 AM
Posts: 1372
Joined: Oct 2009
did you try grounding the wire going to the oil pressure sender and see if the gauge reads higher ? with the sender disconnected
IT MIGHT be as simple as a bad sender or corroded wiring , connections ?
hook up a mechanical gauge and run the engine and see what GAUGE reads,
before major work that may not be needed,
I bought a 8N tractor that had a bad gauge, I am sure the owner thought it needed rebuilding,
motor ran with no noise and gauge did not move, replaced gauge and never had any engine problems,
hope this helps.
my 2 cents 37RAGTOPMAN

05-24-2019 @ 5:18 AM
New Member
Posts: 113
Joined: Aug 2016
I have posted this question too many times and no one has the answer.
All those oil gauges are marked 0 30 80 I am bad at math, but
ain't half of 80 40? My car hot idle, says 30 and my mechanical says 40:
If I move the car even a foot, dash gauge says like 35 and mechanical shoots
to 60 , so what was King Seeley thinking? Ideas any one cause
I don't and I have 5 F6 V8 trucks 2 F8 V8 337s all read the same so its not
senders or the gauges and my every day driver 46 Super Deluxe 59A V8.
And then who has ever had the temp gauge read correctly besides never?


05-24-2019 @ 7:18 AM
Posts: 1372
Joined: Oct 2009
try to
disconnect the wire going to the sender,
and try grounding the electric sender wire to ground,? to see what the gauge does,

I think it should read the highest it can,
if not your gauge is not working correctly
these are not great instruments, that's why the went to warning lights,
so not to alarm owners,
my 2 cents 37RAGTOPMAN
oil pressure relief valve also could be the problem with low oil pressure, broken spring, dirt in it,
might be a thing to check out, also a worn oil pump,

05-24-2019 @ 6:38 PM
Posts: 1147
Joined: Oct 2013
You guys are hijacking nuffsaid's thread. Best for both of you to start your own threads / posts.


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