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Discussion Starter #1
I bought a amc360 140k miles it ran fine and sounded good.

At home on the engine stand all cylinders read between 145 psi and 140 psi except one It's at 90 psi.

What's the chances it just needs a valve job?

I really don't have room in my budget for a rebuild at this time.
 

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Pull the 2 rocker arms. Take the schrader valve out of your compression tester, pull the spark plug, install the comp tester, connect an air hose and listen for air in the crankcase, intake or exhaust. Takes the guessing out without any cost.
 

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Discussion Starter #3
Pull the 2 rocker arms. Take the schrader valve out of your compression tester, pull the spark plug, install the comp tester, connect an air hose and listen for air in the crankcase, intake or exhaust. Takes the guessing out without any cost.
So I could listen in the oil fill hole.
Or In The carb or in the exhaust port right? Those are acceptable listing points right?
 

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Yep.

Although, on a cold engine, you will get some noise in the crankcase. So listen more in the carb and tailpipe to prove a valve problem. Also, you can pull the rad cap, if there are bubbles, you have more problems, but you never said anything about water/oil mixing.
 

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If I heard this engine run and was happy enough to buy it, I would most likely run it as-is. But that's just me.
Travis..
 

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Discussion Starter #7
Well I got my wife to help and she heard it at the exhaust valve.

Thanks for the help.
 

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Take the valve cover off and smack the valve with a rubber mallet while you have air on the cyl to see if the air noise goes away. There may just be a peice of carbon/crud in the valve that will get blown out as soon as you unseat the valve.
Travis..
 
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