Caution: Do not force any form of wedge between cylinder and head because in so doing the gasket will be ruined. To remove head loosen cylinder head nuts about one turn, revolve ?ywheel to bring piston up against compression, and tap head slightly. This usually brings results, if not the first time, try it again. If this is not effective, use a driving bar against bottom of mixer or against edge of inlet port cast into cylinder head. This will be exposed when mixer is removed. Remove the piston by pushing on the connecting rod or place a block of Wood between the connecting rod and crankshaft, then turn flywheel against block, which will help to force out the piston. When disconnecting crank pin bearings be careful not to mix up liners. Mark each set top or bottom and place to one side in the original order in which they were inserted in the bearings. If the rings are found fast in grooves clean by washing in kerosene. Work them up and down in grooves until free. Now remove the first ring with the aid of three thin metal strips as il lustrated. Insert these strips under the ring at the joint leaving two close to the joint. Work the other one to a position opposite the joint The ring is now out of the groove and can easily be removed. Remove the others in like manner. Clean the rings and ring grooves in the piston thoroughly, using a knife to scrape them if necessary. When replacing the rings, put the inner ones in first, using the metal strips as before so as to slide the ring over the groove. After the rings are in position wash piston in gasoline or kerosene to remove all dirt and grit. Then oil the piston and rings thoroughly and place the piston in the cylinder. It is easier to do this with the piston upside down, as joints in the rings and the ring pins can be easier watched. Be sure that the rings are down in their grooves, and not on top of the piston ring pins, then push piston into cylinder.