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Old 04-09-2019, 07:35 PM   #1
Gick70
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Default 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?
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Old 04-09-2019, 07:37 PM   #2
JSeery
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Default Re: Flathead oil pressure change

A mechanical gauge is really the only way to know what is going on.
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Old 04-09-2019, 08:31 PM   #3
Jack E/NJ
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Default 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
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Old 04-09-2019, 10:32 PM   #4
flatjack9
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Default Re: Flathead oil pressure change

the oil pressure taps are 1/4 NPT
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Old 04-10-2019, 11:45 AM   #5
Tinker
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Default 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.


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Old 04-10-2019, 12:53 PM   #6
marko39
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Default Re: Flathead oil pressure change

Did you replace oil gauge with a different one? Might be your problem.
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Old 04-10-2019, 12:59 PM   #7
joe 1950
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Default 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
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Old 04-10-2019, 03:39 PM   #8
Drbrown
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Default 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.
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