The Ford Barn

Gick70 · 04-09-2019, 07:35 PM

So over winter I redid my gauges powder coat,clean up,new bezels,paint and switch out various gauges for better looking,checked full sweep,all good! Now My oil pressure has dropped tremendous from 30lbs to about 15lbs in 10 mile drive! Do I have a gauge problem,oil sender problem or motor problem,I was thinking going to auto parts store for a mechanical gauge and mount it under the hood for my 10 mile ride to see what I get .what pipe thread is that? Am I going the right direction?

JSeery · 04-09-2019, 07:37 PM

A mechanical gauge is really the only way to know what is going on.

Jack E/NJ · 04-09-2019, 08:31 PM

>>>I redid my gauges>>>Now My oil pressure has dropped tremendous>>>Do I have a gauge problem,oil sender problem or motor problem?

Nope. Jack E/NJ

flatjack9 · 04-09-2019, 10:32 PM

the oil pressure taps are 1/4 NPT

Tinker · 04-10-2019, 11:45 AM

Oil thins when it gets warm. So the drop is not unusual. It should also increase some with rpms. Weight of oil can effect the pressure also.

Always good to check it with another mechanical type gauge. So yes, right direction in my thinking.

.

marko39 · 04-10-2019, 12:53 PM

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Did you replace oil gauge with a different one? Might be your problem.

joe 1950 · 04-10-2019, 12:59 PM

best thing to do is install a master gauge ,then you know what you have ,then diagnose from there ,keep us up to date

Drbrown · 04-10-2019, 03:39 PM

2 x JSeery's recommendation to use a mechanical gauge.

I think Ol'Ron would say 15 lbs hot is okay at idle. At Idle, my mechanical gauge starts at about 65 lbs cold and when hot reads abt 20 lbs. I use 10w-30.

04-09-2019, 07:35 PM	#1
Gick70 Senior Member Join Date: Aug 2017 Posts: 107	Flathead oil pressure change So over winter I redid my gauges powder coat,clean up,new bezels,paint and switch out various gauges for better looking,checked full sweep,all good! Now My oil pressure has dropped tremendous from 30lbs to about 15lbs in 10 mile drive! Do I have a gauge problem,oil sender problem or motor problem,I was thinking going to auto parts store for a mechanical gauge and mount it under the hood for my 10 mile ride to see what I get .what pipe thread is that? Am I going the right direction?

04-09-2019, 07:37 PM	#2
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: Flathead oil pressure change A mechanical gauge is really the only way to know what is going on.

04-09-2019, 08:31 PM	#3
Jack E/NJ Senior Member Join Date: May 2010 Posts: 2,173	Re: Flathead oil pressure change >>>I redid my gauges>>>Now My oil pressure has dropped tremendous>>>Do I have a gauge problem,oil sender problem or motor problem? Nope. Jack E/NJ

04-09-2019, 10:32 PM	#4
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Flathead oil pressure change the oil pressure taps are 1/4 NPT

04-10-2019, 11:45 AM	#5
Tinker Senior Member Join Date: May 2010 Location: MN Posts: 7,053	Re: Flathead oil pressure change Oil thins when it gets warm. So the drop is not unusual. It should also increase some with rpms. Weight of oil can effect the pressure also. Always good to check it with another mechanical type gauge. So yes, right direction in my thinking. .

04-10-2019, 12:53 PM	#6
marko39 Senior Member Join Date: Oct 2016 Location: harpursville ny Posts: 1,040	Re: Flathead oil pressure change Sponsored Links (Register now to hide all advertisements) Did you replace oil gauge with a different one? Might be your problem.

04-10-2019, 12:59 PM	#7
joe 1950 Senior Member Join Date: Mar 2013 Location: Green Bay Wi Posts: 400	Re: Flathead oil pressure change best thing to do is install a master gauge ,then you know what you have ,then diagnose from there ,keep us up to date

04-10-2019, 03:39 PM	#8
Drbrown Senior Member Join Date: Oct 2013 Location: Glens Falls NY Posts: 1,267	Re: Flathead oil pressure change 2 x JSeery's recommendation to use a mechanical gauge. I think Ol'Ron would say 15 lbs hot is okay at idle. At Idle, my mechanical gauge starts at about 65 lbs cold and when hot reads abt 20 lbs. I use 10w-30.