This is what happened to me ..I was moving the cylinder from the top of the crankcase to the work bench ,on the way over to it I triped and fell forward just at the bench,the cylinder just did land on the bench,  but hit with enough force to push the piston sleeve up and about 1/8 of an inch. I have tryed to get it back in but no luck as of yet..  tryed a 4x4 and hammer... rubber mallett..   

http://www.metropwr.com/

 
Brand new Stationary Metro Lister clone engine 6/1 model. 6 HP at 650 RPM, 1 cylinder ,water cooled. 2" Shaft. Liner type engine with Indirect Injection, which is a great choice for burning Waste veg. Oil. These are a nice tough old style engine. Very simple - exposed push rods, fuel pumps and injectors. Has slightly under 2' Flywheels. You need to supply cooling water tank, uses thermosiphon - no cooling water pump. Has Taper Roller Bearing mains. About 1200 #. Flywheel is machined for serpintine belt, which drives the 4 kW 1800 RPM generator end. 110/220 Volt. Wires are pigtailed from generator end for you to hook up to your breaker. Comes in kit form - Engine, generator and welded steel frame. You will need bolts and lock nuts to bolt to frame. Figure on 8 - 12 hours to get all set up. Serpintine belt and generator end serpintine sheeve are included. You will need a good mechanical background to run this engine. They need to be tended to, if you just want some back up power you will likely be better off with a Home Depot/Lowes generator. Also have engines available. 1200.00 ea.