Oil pressure gauge

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rsessoms
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Joined: Fri May 28, 2021 10:02 am
Zip Code: 27858
Tractors Owned: 1958 Farmall 130
1948 Farmall Cub
1949 Farmall Cub
1955 Farmall Cub

Oil pressure gauge

Postby rsessoms » Thu Dec 23, 2021 6:13 pm

I finished going through my first Cub I got from front to back. Hooked up a drag harrow to pull around the farm paths and give a good strained workout like others suggest to do. I noticed at idle that the original oil pressure gauge only comes up a quarter way, and when dragging it goes to halfway. In the repairs, I didn't pay attention to the oil pickup screen like I do now on the others, and wasn't aware of priming the pump after oil change. It has run smoothly and compression checked out good. A bit concerned about the low pressure though. The 55 I got immediately pegs out as soon as it starts. Pull the pan and check the screen? Open to suggestions.

Donegal Cub
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Re: Oil pressure gauge

Postby Donegal Cub » Fri Dec 24, 2021 12:04 pm

Read the topics below your post on oil pressure gauges.

Clemsonfor
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Re: Oil pressure gauge

Postby Clemsonfor » Fri Dec 24, 2021 11:12 pm

Chances the bearings are worn as well.

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Re: Oil pressure gauge

Postby Eugene » Fri Dec 24, 2021 11:38 pm

Clemsonfor wrote:Chances the bearings are worn as well.
For sure if you didn't at least inspect/measure the clearance.

What does
going through my first Cub I got from front to back
mean?
I have an excuse. CRS.

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Glen
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Re: Oil pressure gauge

Postby Glen » Sat Dec 25, 2021 2:25 am

Hi,
The oil pressure you describe sounds about right, according to several years of Cub owner's and operator's manuals.
You didn't say what year Cub it is, I guess it is the 1948 your info says you have.

Below is a page from the 1950 Cub owner's manual, read what it says at the lower right of the page, and below the gauge pic.

http://farmallcub.com/rudi_cub/www.clea ... e%2005.jpg

Below is a page from the 1955 Cub operator's manual, they changed the words a little.

http://farmallcub.com/rudi_cub/www.clea ... age-05.jpg

Below is a page from the 1959 Cub operator's manual, it shows the gauge with numbers.

http://farmallcub.com/rudi_cub/www.clea ... age-06.jpg

It sounds like your 1955 Cub has too much oil pressure, but if it goes down when it warms up, it is probably ok.

You could remove the oil pan and clean it and the oil intake screen, if you didn't.

You don't need to prime the oil pump if the oil gauge shows pressure. :)

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radioguy41
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Re: Oil pressure gauge

Postby radioguy41 » Sat Dec 25, 2021 9:42 am

Different gauges have different pressure ranges so without seeing what specific oil pressure gauges are on each tractor it's impossible to answer the question. Some gauges are 0-40 and some gauges are 0-75. Halfway on a 0-40 will appear low on a 0-75. Conversely halfway on a 0-75 will appear high on a 0-40. Post photos if you can.
Circle of Safety Image ImageImage
KB3WBB

rsessoms
Posts: 17
Joined: Fri May 28, 2021 10:02 am
Zip Code: 27858
Tractors Owned: 1958 Farmall 130
1948 Farmall Cub
1949 Farmall Cub
1955 Farmall Cub

Re: Oil pressure gauge

Postby rsessoms » Sun Dec 26, 2021 11:15 am

Eugene wrote:
Clemsonfor wrote:Chances the bearings are worn as well.
For sure if you didn't at least inspect/measure the clearance.

What does
going through my first Cub I got from front to back
mean?

She ended up being a hot mess, the more I started inspection when I got it home. Started with new radiator and bolster. Then rear engine seal during clutch and pressure plate. Ending with total rebuild of both finals and new tires all the way around.

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Re: Oil pressure gauge

Postby inairam » Mon Dec 27, 2021 7:42 am

What weight oil do you use? I run a Shell Rotella 15W40 oil. I was running a 10-30 oil until and a number of people here and Ron at TM tractors suggested it was too light. My oil pressure increased and blow-by decreased.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Glen
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Location: Wa.

Re: Oil pressure gauge

Postby Glen » Mon Dec 27, 2021 7:40 pm

Hi,
The Cub and LoBoy service manual says that a Cub and LoBoy engine has 30 - 35 lbs of oil pressure at 1800 RPM. That is probably for a new engine.
You can see where that would be on the pic of the gauge with the numbers that I posted above. :)

Clemsonfor
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1952 Farmall Cub
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Location: Greenwood County SC

Re: Oil pressure gauge

Postby Clemsonfor » Mon Dec 27, 2021 9:21 pm

inairam wrote:What weight oil do you use? I run a Shell Rotella 15W40 oil. I was running a 10-30 oil until and a number of people here and Ron at TM tractors suggested it was too light. My oil pressure increased and blow-by decreased.

I run it in everything besides my daily drivers. It's Jaso rates for wet clutches so it makes a good ATV oil, it works well in mowers, your tractors , generators, and other stationary motors. Makes things simple by only having one oil for all those. I buy 2.5 gallons of 15w40 at the time and refill 1 gallon n jugs to fill the smaller things.


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