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O-320 Replacement Cylinders

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Mountain Pilot

Well-Known Member
Apr 13, 2010
Reaction score
Went out to fly the 140 last weekend and could only get about 2,000 RPM on full power run-up. After about 2 minutes at full power the RPM then came up to 2,250 RPM and #3 cylinder EGT then came up. After it cooled off overnight the same thing happened. Looks like a sticking exhaust valve. Local I/A came and looked at it, suggested removing #3 Cylinder and cleaning the guide and valve stem, but looking further at past compression tests, that cylinder has been low on compression for about 200 hrs of running. ( 60/80 ) Lots of ring seepage. :eek:

Decision was made to replace cylinder with a new unit.

With constant change in cylinder manufactures I am not sure which will be the best to purchase ( I plan to upgrade to 160 hp at next overhaul in about 200 hrs )

Let's hear from those who have purchased new cylinders in the last few years and those A/P -- I/A's that work on the O-320's :geek:

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