Re: 3 out of 4 Good

Posted by Wayne Swenson on April 10, 2006 at 12:37:37 from (24.181.155.110):

In Reply to: 3 out of 4 Good posted by DelMN on April 10, 2006 at 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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