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

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51f1
08-19-2019 @ 5:08 PM
Senior
Posts: 571
Joined: Oct 2009
          
This is an old thread. I probably said the same thing above.

Regarding Senior's oil pressure problem: I had the same experience with a Carpenter sending unit. It reads a maximum of 30 psi. My old and failed NOS sending unit always read 50 psi as it should. I double checked with a mechanical gauge and got 50 psi. Carpenter doesn't have a clue as to the problem and really doesn't care. (I got another Carpenter unit. It also read 30 psi.) I use the new sending unit which shows 30 psi knowing that it is really 50 psi.

I had the same problem with a Carpenter temperature sending unit. It reads low, but I'm living with it.

Chinese junk, I'd guess.

Richard

This message was edited by 51f1 on 8-19-19 @ 5:20 PM

len47merc
05-24-2019 @ 6:38 PM
Senior
Posts: 1146
Joined: Oct 2013
          
You guys are hijacking nuffsaid's thread. Best for both of you to start your own threads / posts.


Steve

37RAGTOPMAN
05-24-2019 @ 7:18 AM
Senior
Posts: 1287
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,



GK1918
05-24-2019 @ 5:18 AM
New Member
Posts: 112
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?

sam


37RAGTOPMAN
05-07-2019 @ 8:43 AM
Senior
Posts: 1287
Joined: Oct 2009
          
HI
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,
DIAGNOSIS problem FIRST
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

TomO
05-01-2019 @ 9:34 AM
Senior
Posts: 5890
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

https://www.ebay.com/itm/1935-53-Ford-Mercury-Flathead-V8-Oil-Pressure-Sending-Unit-80lb-41A-9278/202608065816?epid=1922969814&hash=item2f2c61bd18:g:QUUAAOSwBRlcdDFC

Tom

51f1
04-30-2019 @ 6:11 PM
Senior
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?

Richard

nuffsaid
04-15-2019 @ 5:08 PM
Member
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.

nuffsaid
04-15-2019 @ 5:00 PM
Member
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.







danel321
04-05-2019 @ 12:07 AM
Member
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.

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