oil pressure

[serge]

what would be a normal oil pressure on a 1940 Ford 9N?


thanks

 

[John in Mich]

Depends on the condition of the engine. An old tired one might be as low as 5 pounds at idle to 20lbs or so at wide open. A tighter engine can easily be 30 to 60+ at idle and higher at wide open. Also depends on: oil viscosity and the accuracy of your gauge.

 

[Den N Ms]

(quoted from post at 09:35:37 02/09/15) Depends on the condition of the engine. An old tired one might be as low as 5 pounds at idle to 20lbs or so at wide open. A tighter engine can easily be 30 to 60+ at idle and higher at wide open. Also depends on: oil viscosity and the accuracy of your gauge.

John,I would say that if you have 60 psi at an idle,something is bad wrong,Oil viscosity 120 weight?
Or accuracy of your gauge? Not to accurate.Let alone if it has 60 psi at idle what would oil pressure be at WOT.

 

[TheOldHokie]

(quoted from post at 13:15:29 02/09/15)

(quoted from post at 09:35:37 02/09/15) Depends on the condition of the engine. An old tired one might be as low as 5 pounds at idle to 20lbs or so at wide open. A tighter engine can easily be 30 to 60+ at idle and higher at wide open. Also depends on: oil viscosity and the accuracy of your gauge.

John,I would say that if you have 60 psi at an idle,something is bad wrong,Oil viscosity 120 weight?
Or accuracy of your gauge? Not to accurate.Let alone if it has 60 psi at idle what would oil pressure be at WOT.

You could easily get 60 PSI at idle if the oil was cold and the relief valve was not functioning. "Good" hot oil pressure on a flathead engine is 30+ PSI. MAX pressure hot or cold around 45-50 PSI with a properly functioning pressure relief.

TOH

 

[serge]

so if I only have around 20 should I worry? or if it's good for a wile

thanks

 

[TheOldHokie]

(quoted from post at 15:26:29 02/09/15) so if I only have around 20 should I worry? or if it's good for a wile

thanks

Oil pressure changes significantly with engine RPM and oil temperature. Reporting 20 PSI without telling us an RPM and some indication of oil temperature makes it very difficult to give a erliable answer.

If you have 20 PSI at idle with the engine fully up to operating temperature you have better than average oil pressure.

If you have 20 PSI at 2000 RPM with the engine just started and stone cold not nearly as good.

If you have 5 PSI at 2000 RPM with the engine fully up to operating temperature you have barely enough oil pressure to keep the engine from self destructing.

So would you like to rephrase your question?

TOH

 

[serge]

it is very hard to give you a RPM I do not have a meter

when starting in my garage before completely warm it is around 15, after running outside at idle for about 5 minute the engine is warm and it is at 18, if I push snow with the throttle half way it goes up to 20, after working for about 30 minutes if I got it back at idle I still have around 18

I will change my oil for 10w30 instead of my 40 non detergent

sorry sometime I have problem to explain myself

Thanks

 

[TheOldHokie]

(quoted from post at 16:33:17 02/09/15) it is very hard to give you a RPM I do not have a meter

when starting in my garage before completely warm it is around 15, after running outside at idle for about 5 minute the engine is warm and it is at 18, if I push snow with the throttle half way it goes up to 20, after working for about 30 minutes if I got it back at idle I still have around 18

I will change my oil for 10w30 instead of my 40 non detergent

sorry sometime I have problem to explain myself

Thanks

I would have expected a bigger pressure difference between the idle and half throttle readings. It's certainly acceptable oil pressure.

TOH

 

[Braxmaier]

(reply to post at 15:11:29
02/09/15)

I'm in the same boat I was thinking of running 15/40 in it, do you guys recommend Changing the pressure relief valve?

 

[Braxmaier]

(quoted from post at 18:34:29 02/09/15)

(reply to post at 15:11:29
02/09/15)

I'm in the same boat I was thinking of running 15/40 in it, do you guys recommend Changing the pressure relief valve?

ine starts at 20 and stays.

 

[TheOldHokie]

(quoted from post at 21:34:29 02/09/15)

(reply to post at 15:11:29
02/09/15)

I'm in the same boat I was thinking of running 15/40 in it, do you guys recommend Changing the pressure relief valve?

No.

TOH

 

[serge]

(quoted from post at 15:11:29 02/09/15)

(quoted from post at 16:33:17 02/09/15) it is very hard to give you a RPM I do not have a meter

when starting in my garage before completely warm it is around 15, after running outside at idle for about 5 minute the engine is warm and it is at 18, if I push snow with the throttle half way it goes up to 20, after working for about 30 minutes if I got it back at idle I still have around 18

I will change my oil for 10w30 instead of my 40 non detergent

sorry sometime I have problem to explain myself

Thanks

I would have expected a bigger pressure difference between the idle and half throttle readings. It's certainly acceptable oil pressure.

TOH

I just did an oil change for 10w30 I will give a try sometime this week to see if will be a difference

 

[dkcorbin]

the manual says 15-30 for what that's worth.. So, these things were made for farmers who had been using a horse , suffered through various degrees of abuse over the last 7o+ years. Not made to go to Mars. You here people talk about 30 to 45. Exception more than the rule but possible if you are AR to every absolute possible detail. If you said you had 45 they would say that was wrong to. Drive it and have fun with it. Like I said, they were made for people with little or no prior experience whith mechanized farm equipment and the reason why they were so popular is they were nearly indestructible. Yours being that old is testament enough.

 

[TheOldHokie]

(quoted from post at 22:42:49 02/09/15)

(quoted from post at 15:11:29 02/09/15)

(quoted from post at 16:33:17 02/09/15) it is very hard to give you a RPM I do not have a meter

when starting in my garage before completely warm it is around 15, after running outside at idle for about 5 minute the engine is warm and it is at 18, if I push snow with the throttle half way it goes up to 20, after working for about 30 minutes if I got it back at idle I still have around 18

I will change my oil for 10w30 instead of my 40 non detergent

sorry sometime I have problem to explain myself

Thanks

I would have expected a bigger pressure difference between the idle and half throttle readings. It's certainly acceptable oil pressure.

TOH

I just did an oil change for 10w30 I will give a try sometime this week to see if will be a difference

When you do that test:

• [*:dda7633253]Start the engine and immediately record the oil pressure at idle and roughly 3/4 throttle.[*:dda7633253]Let the engine get thoroughly warmed up and again record the pressure at idle and 3/4 throttle.[*:dda7633253] Post those numbers along with the ambient room temperature at the time the tractor was first started.[/list:dda7633253]TOH

 

[TheOldHokie]

(quoted from post at 22:49:16 02/09/15) the manual says 15-30 for what that's worth.. So, these things were made for farmers who had been using a horse , suffered through various degrees of abuse over the last 7o+ years. Not made to go to Mars. You here people talk about 30 to 45. Exception more than the rule but possible if you are AR to every absolute possible detail. If you said you had 45 they would say that was wrong to. Drive it and have fun with it. Like I said, they were made for people with little or no prior experience whith mechanized farm equipment and the reason why they were so popular is they were nearly indestructible. Yours being that old is testament enough.

Ford provided pretty specific guidance to the horse farmers. From the 1950 8N Operator's Manual.

TOH