sign of blowby? Sounds of air leaking.

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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havoc1482
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sign of blowby? Sounds of air leaking.

Postby havoc1482 » Sat Jul 12, 2014 5:26 pm

Dropped the pan today to have a looks-ey before I changed my oil, and I turned the crank and heard this:




Thoughts?
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John *.?-!.* cub owner
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Re: sign of blowby? Sounds of air leaking.

Postby John *.?-!.* cub owner » Sat Jul 12, 2014 9:14 pm

sounds pretty normal to me. with the engine cold, you will here air hissing past the ring gaps as you move the piston slowly.
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havoc1482
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Re: sign of blowby? Sounds of air leaking.

Postby havoc1482 » Sat Jul 12, 2014 9:52 pm

Wasn't cold tho lol. I warmed it up a little so the oil would flow out better. I do that will all my machines/cars
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Re: sign of blowby? Sounds of air leaking.

Postby Eugene » Sat Jul 12, 2014 10:49 pm

What did the compression tests or leak down test tell you?
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havoc1482
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Re: sign of blowby? Sounds of air leaking.

Postby havoc1482 » Tue Jul 22, 2014 1:51 pm

I took a sparkplug compression test. It wasn't warm, but wasn't exactly cold, it was run for a little bit about 45 minutes prior. I got 90, 90, 90, 85 in cylinders 1-4 respectively. I was taking it by running it using the starter, and not actually firing the engine, was that the correct procedure?
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Re: sign of blowby? Sounds of air leaking.

Postby Denny Clayton » Wed Jul 23, 2014 9:01 am

havoc1482 wrote:I took a sparkplug compression test. It wasn't warm, but wasn't exactly cold, it was run for a little bit about 45 minutes prior. I got 90, 90, 90, 85 in cylinders 1-4 respectively. I was taking it by running it using the starter, and not actually firing the engine, was that the correct procedure?

Yes. Remove all 4 plugs first and crank the starter while testing each cylinder until the gauge no longer rises.
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Re: sign of blowby? Sounds of air leaking.

Postby Matt Kirsch » Thu Jul 24, 2014 11:56 am

Compression's a little low but there's still plenty of life left as long as it has good oil pressure and doesn't smoke too much for your liking.

But I agree, the hissing sound is normal for an old engine with some wear in it. Once it fires off and starts running it seals up pretty well.


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