Oil Pressure on my 47 Cub

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LU&E42
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Oil Pressure on my 47 Cub

Postby LU&E42 » Mon Mar 11, 2019 3:48 pm

The end of December I bought a 47 cub. I ran it a bit just to make sure all the basics worked, then it got parked in my barn to wait for warmer temps. This past Saturday I started maintenance on it by changing the oil. Drained everything, it was black and thick. The oil level was touching the bottom of the dipstick. So, new 10w30 oil, new filter, primed the pump, fired it up and the gauge pegged to the high side.
Oil Pressure.jpg

Before the oil change it ran in the middle of the gauge. Double checked to make sure I didn't over fill and I hadn't. What did I miss? Recommendations on how to proceed are welcome.

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Shane N.
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Re: Oil Pressure on my 47 Cub

Postby Shane N. » Mon Mar 11, 2019 4:15 pm

Bad gauge?
Every home is a school, what are you teaching?

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indy61
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Re: Oil Pressure on my 47 Cub

Postby indy61 » Mon Mar 11, 2019 4:26 pm

My gauge nears the high end when cold but takes a minute to get there. Drops below 1/2 after it warms up.
The only thing I can think of is faulty/incorrect gauge or a problem with the oil pressure relief, which is rare.

inairam
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Re: Oil Pressure on my 47 Cub

Postby inairam » Mon Mar 11, 2019 4:29 pm

What is the throttle setting? Does the pressure go down at lower throttle?
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Oil Pressure on my 47 Cub

Postby Eugene » Mon Mar 11, 2019 5:08 pm

Normal, nothing to worry about. Echo the others that state the oil pressure gauge pegs or is near pegging with cold engine on start up.

Just check to see that the gauge does not drop into the red zone after engine is fully warmed up and throttled down.
I have an excuse. CRS.

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Sailor
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Re: Oil Pressure on my 47 Cub

Postby Sailor » Mon Mar 11, 2019 5:51 pm

I would agree, the oil relief value (Oil Pressure Valve) would rarely malfunction, If the oil was new and the engine were operated on a regular basis. When I had the same problen before and after my engine was overhauled, I too suspected a bad gague... after replacing the old one, I still had the same problem.
I suggest you pull the Oil Pressure Valve. It's located up front, on the right side of the engine. Inspect the spring, valve and the interior of the cylinder for rust. My engine hadn't run for some time and rust had formed on the inside of the cylinder and was restricting oil flow. Sounds like your problem is just the opposit. It's about a 15 minute job unless you have to remove the small section of radiator hose.
You can find the proceedure detailed in the Service Manual GSS-1411 with Rev 1, Section 1, Page 1-55

Let us know how it worked out because I think that same gripe has come twice lately.
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Re: Oil Pressure on my 47 Cub

Postby bubbaearl » Mon Mar 11, 2019 6:34 pm

I overhauled one of my cubs last summer and when I fired it up the needle went just about all the way and I said this thing sure has a lot of pressure and a mechanic friend told me it should not have that much. I changed the gauge and it went back to normal.

inairam
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Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 with c-2 mower & c-54 grader blade 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v
1975 with homemade mower 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 6 v
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Oil Pressure on my 47 Cub

Postby inairam » Mon Mar 11, 2019 7:14 pm

Before you pull the pressure relief valve I would run it a while and maybe rerun the test on a warm day maybe add some seafoam to the oil for the next few oil changes.

You said the oil was very thick and black. You now put a detergent oil in and it is cleaning everything out. After a few hours of run time replace the filter and maybe replace the oil and filter after a few hours more.

If you still have the high-pressure, after a warm-up, then think about the next step.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Oil Pressure on my 47 Cub

Postby Glen » Mon Mar 11, 2019 7:45 pm

Hi,
I would check the oil pressure after warming up the engine fully, and see if it goes down, like was said above.

If you need a new oil gauge, TM Tractor has some that they say they had made to match the originals.
This one below matches the first style of gauge used on Cubs.

http://www.tmtractor.com/new/en/2645fp.htm

If you would rather have a guage with numbers, TM Tractor has them that go to 40 lbs.
This gauge style was used beginning in the mid 1950's.
The Cub service manual says the Cub engine has 35 lbs of oil pressure max, at 1800 RPM.

http://www.tmtractor.com/new/en/3291fp.htm

LU&E42
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Re: Oil Pressure on my 47 Cub

Postby LU&E42 » Tue Mar 12, 2019 8:14 am

Thanks all for the responses. I'll try these steps and see where that gets me.

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Re: Oil Pressure on my 47 Cub

Postby jsfarmall » Thu Mar 14, 2019 11:31 am

Nothing wrong. A clogged filter will show lower oil pressure. 4 of mine does anyway. Better filter, better oil, better flow. No knocks? Pings? Bangs? Send it.
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1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
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1965 IH Cub "Annie" mower tractor,
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1953 Farmall Super M


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