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3 out of 4 Good

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DelMN

04-10-2006 07:31:55




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I did a compression check in a SC that I just bought and 1,2,4 were 120 lbs. #3 was 20 lbs. #3 plug was also fouled. I checked the valves on #3 and they were not stuck open. The head gasket on the outside appears ok. I suspect piston, seized rings or ?? Any thoughts before I tear the head off. I really don't want to start another project if is a major fix.
Thanks,




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James Williams

04-10-2006 19:37:08




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 Re: 3 out of 4 Good in reply to DelMN, 04-10-2006 07:31:55  
Del,If you do a rebuild,I am looking for 3 sleeves 31/8 dia,seems like there hard to find



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Wayne Swenson

04-10-2006 12:37:37




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 Re: 3 out of 4 Good in reply to DelMN, 04-10-2006 07:31:55  
Bring # 3 to top dead center on compression stroke and carefully apply compressed air to the spark plug hole. Air will leak out even in a perfect engine. Listen to where that air is excaping from. Hissing sounds in the exhaust pipe/muffler = exhaust valve problems; air escaping at the carburetor/air cleaner = intake valve problems; air escaping from the oil fill hole = bad rings.
I just bought a cylinder leak-down tester on eBay. It tells you where AND how badly your compression is being lost.
I used a tester like that many years while teaching mechanics.
PS: putting compressed air into a cylinder MAY cause the crankshaft to rotate (that is what causes an engine to run in the first place) so either hold the crank with a tool, put in gear & lock the brakes, or just slowly add air until you know what is going to happen.
DON"T GUESS; TEST!!

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Stan(PA)

04-10-2006 09:06:00




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 Re: 3 out of 4 Good in reply to DelMN, 04-10-2006 07:31:55  
With the other cylinders reading so good, I"d guess it almost has to be the valves. You say "I checked the valves on #3 and they were not stuck open", but are they possibly adjusted too tight, and hanging open a little? Maybe the valve is burned on #3? Maybe seats are worn on #3? Maybe #3 valves are carboned up, not allowing them to close fully? I don"t know why, but #3 seems to almost always be the worst one. Could be stuck rings, but I"d almost bet on valve issues.

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old

04-10-2006 08:23:38




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 Re: 3 out of 4 Good in reply to DelMN, 04-10-2006 07:31:55  
Fill that cylinder with tranny fluid and let it sit a few days. Then if you have a hand crank for it, put the plug in and slowly turn the engine over so it compresses the tranny fluid in that cylinder, don't use the starter motor to do that. Also if you can remove the exhaust pipe so you can look in the exhaust manifold and remove the air cleaner pipe. Turning it over the compress the tranny fluid like that will tell you if either one of the valves and leaking and it will also force the tranny fluid down and in to the rings so if they are stuck thay may pop loose faster. Poor mans way to check valves and if they are seating right. Then after doing that clear the cylinder and recheck compression on that cylinder, you may find it has gone up

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ChadS

04-10-2006 08:08:34




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 Re: 3 out of 4 Good in reply to DelMN, 04-10-2006 07:31:55  
Sounds like the valves are bad. rings could be gone south too. Maybe you could have the one cyl fixed if the rest look in good shape. Chad



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