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8N Compression readings-OK?

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Gene Miller

06-07-2001 09:50:11

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While I've got the tractor apart replacing the water pump I did a compression check on her. Cylinder 1 is 98 pounds, 2 is 120, 3 is 110 and 4 is 120. Does this sound OK to you guys??

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Dell (WA)

06-07-2001 10:42:46

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Re: 8N Compression readings-OK? in reply to Gene Miller, 06-07-2001 09:50:11

Gene..... .Andy's gave good advice.

Your number one is suspiciously low. Do a dry and wet compression check.

You may have 1) burned exhaust valve, 2) stuck piston rings, 3) leaky head gasket, 4) maybe didn't get a good seal on your compression gauge.

Let us know how it checks out, we care..... ..Dell

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Andy - Hammond, LA

06-07-2001 10:17:55

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Re: 8N Compression readings-OK? in reply to Gene Miller, 06-07-2001 09:50:11

Was this compression test done dry or wet? Did you try to inject some oil into the cylinder especially on #1 to see if it would show an increase due to worn seals? I was told back when mine tested 115 across the board that it is more important to have somewhat uniform readings than the actual level of the reading itself. (above 90psi though of course) - Sounds like 2-3-4 are fine but 1 might be showing some problems. It will properly run fine for quite some time. As Claus would say, "Why go around messin' with stuff when it works?"

grin.

Andy

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ED-illinois

06-07-2001 09:55:18

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Re: 8N Compression readings-OK? in reply to Gene Miller, 06-07-2001 09:50:11

from what I remember reading, anything above 90 is good.

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Gene Miller

06-07-2001 11:52:56

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Re: Re: 8N Compression readings-OK? in reply to ED-illinois, 06-07-2001 09:55:18

Hi!

Thanks for the advice! It was a dry test and I did all of them 3 times just to make sure. Sounds like it's worth the effort to use the oil and find out if it's rings or valves in number one. One thing I forgot to mention is the spark plugs are pretty rusty so they've been there awhile but the electrodes looked pretty normal with no fouling showing around the tip. Just a nice clean burn. This tractor starts on the first hit of the starter everytime and runs smooth except when the distributor got wet from the water pump leak.

I'm also going to re-torque the head since whoever did the 12 volt conversion did such a poor job of wiring the nuts holding the alternator bracket could be looser than the rest and they are directly next to number 1 cylinder.

She's going to get a complete overhaul after Summer but I really need her now to keep the Ranch up and bush hogging.

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