Oil pressure light

[flyerdan]

Chances are that the main bearings are worn enough that it bleeds oil pressure at idle below the 5 or 10 psi threshold of the switch for the light, as you've found upping the idle a bit gives enough psi boost to keep it off. Going to a thicker oil would help, but depending on climate could cause winter issues with starting hard. Replacing the main bearings is an option, but not typically a first timer project.

 

[rScotty]

Chances are that the main bearings are worn enough that it bleeds oil pressure at idle below the 5 or 10 psi threshold of the switch for the light, as you've found upping the idle a bit gives enough psi boost to keep it off. Going to a thicker oil would help, but depending on climate could cause winter issues with starting hard. Replacing the main bearings is an option, but not typically a first timer project.

Probably it is just that the idle was set borderline too low anyway, and new oil with lighter viscosity caused a false low pressure alarm. Cure is raise the idle.
Main bearing wear is rare even in much older motors.

 

[Mike1955]

Probably it is just that the idle was set borderline too low anyway, and new oil with lighter viscosity caused a false low pressure alarm. Cure is raise the idle.
Main bearing wear is rare even in much older motors.

Rscotty before the oil change it was most likely some low on the dip stick. He filled it with new non diluted oil and it helped. I’ve got a 600 ford with an oil gauge, when it gets a quart low the gauge is up and down. That how I know to check oil in it. Just old 70 year old equipment for you

 

[Williy]

It sounds like to added a thinner oil just up the idle

willy

 

[5030]

Probably it is just that the idle was set borderline too low anyway, and new oil with lighter viscosity caused a false low pressure alarm. Cure is raise the idle.
Main bearing wear is rare even in much older motors.

That is entirely dependent on how the tractor was maintained and if the oil was changed in a timely manner. Oil clearance with insert bearings is entirely dependent on regular changes with quality oil more than anything else and good filtration as well. Using cheap motor oil and extending change intervals and / or not changing the oil filters in a timely manner can cause insert bearings to wear and oil clearance to become excessive and that results in low oil pressure and idiot lights to illuminate.

In ANY engine, the oil is the life blood of the engine so change it and the oil filter regularly. In the grand scheme of things, oil and oil filters are a cheap date.

 

[Mike1955]

When that was bought new I’d bet it ran with 30 wt oil. Now multi viscosity, make enough difference to notice. And you might overhaul it and sadly have the same issue.

 

[Willismtn]

Ok, not the sensor that we can tell, however we think the oil cooler is clogged, going to replace. Seems very weird though to me but I’m not a mechanic but my brother in law is and we are thinking that is what it could be.

 

[Willismtn]

I’m also ordering a service manual as well

 

[Mike1955]

Ok, not the sensor that we can tell, however we think the oil cooler is clogged, going to replace. Seems very weird though to me but I’m not a mechanic but my brother in law is and we are thinking that is what it could be.

Well is sounds like a definite restriction! I didn’t even know it had one. Sir good luck

 

[Linda White]

Workmaster 33 Oil pressure light comes on at idle but goes of with increase rpm. New oil and oil filter. Any thoughts would be welcome

I want to confirm first—are you using the recommended oil viscosity? If the oil is too thin, it might not maintain enough pressure at low RPMs. If the viscosity is right, you may check out the sensor, oil pump, or possibly wear in the engine bearings. Replacing one of those might fix the issue.