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Compression

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Cbecker
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Compression

Postby Cbecker » Tue Sep 15, 2015 9:01 am

I recently purchased a 1952 Cub. It has not had much use the past several years. It smokes a fair amount when running. Planning to pull the hood and tank this evening to check compression, and was wondering how much compression a tight nine should have.

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Eugene
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Re: Compression

Postby Eugene » Tue Sep 15, 2015 1:13 pm

Report back with the dry then wet test readings.
I have an excuse. CRS.

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Stanton
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Re: Compression

Postby Stanton » Tue Sep 15, 2015 2:03 pm

Welcome to the forum. It's tight, but you don't have to remove the hood to do a compression test. Have done several with hood intact.

Let us know what you find out. The GSS-1008 Specifications Manual (available via the links across the top of the screen) states that 120 PSI is the approximate compression mark. But engines will start/run with a lot lower numbers.
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Cbecker
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Re: Compression

Postby Cbecker » Tue Sep 15, 2015 6:34 pm

All cylinders are between 100-110 dry, and 115-120 wet. Those sound like good numbers to me. Maybe this weekend I will pull the head and see what the valves look like. Or I may just change oil and run it some and see if it clears up. This tractor belonged to my cousin who recently passed away. He had a total of 41 tractors, with 9 Cubs. So, I pretty sure it hasn't been run much lately.

Eugene
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Re: Compression

Postby Eugene » Tue Sep 15, 2015 6:50 pm

I wouldn't remove the head. Compression numbers are close to excellent.

Suggest some Sea-Foam in the oil and fuel. Operate the tractor for some time, under load. I have the feeling that the smoke will clear up.
I have an excuse. CRS.

Cbecker
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Re: Compression

Postby Cbecker » Tue Sep 15, 2015 7:40 pm

Thanks for you input.

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Stanton
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Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
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Location: Lone Jack, MO

Re: Compression

Postby Stanton » Wed Sep 16, 2015 6:53 am

Eugene wrote:I wouldn't remove the head. Compression numbers are close to excellent.


Agreed. If you did want to look at the valves, you wouldn't pull the head. The plate behind the manifold on the side of the block is where the valves are located. Owner's and Service Manuals are available for free download that cover procedure on this...have you downloaded them yet?
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Matt Kirsch
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Re: Compression

Postby Matt Kirsch » Wed Sep 16, 2015 1:58 pm

Seafoam does its best work when introduced directly into the intake manifold, either through the vacuum port or by spraying into the air intake of the carburetor.

All putting it in the oil does, in my experience, is make the oil pressure scary low.


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