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This document shows how to replace a piston valve assemblyPiston/Cylinder Assembly1.  Using a small wrench or other tool, pry off the piston fan.  Use the least amount of force possible to avoid damaging the fan. 2.  Before removing the piston, you must first prevent movement of the eccentric. Do this by placing a wrench handle or socket wrench extension bar in the eccentric. Make sure the tool you are using is sturdy enough to hold the eccentric and belt in place.   …