Try a cylinder leakdown test before doing any disassembly. I've detailed the procedure several times, so an archive search might bring it up.

I'm typing one-handed after carpal tunnel surgery this morning, so how about dropping me a PM if you don't find it and I'll send you a phone number to call. It's simpler to talk you through the procedure right now than it is to write several paragraphs!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!