Abstract: A power assembly for an internal combustion engine includes a cylinder with a circular wall defining a first inside diameter. A piston is reciprocably housed within the cylinder. An integral, unitary piston deposit scraper is formed in a portion of the circular wall of the cylinder by upsetting a portion of the metallic wall so as to configure a piston scraper with a second inside diameter which is less than the first inside diameter. The inside diameter of the piston scraper closely matches that of the outside diameter of the top land of the piston. As a result, the piston scraper removes combustion deposits from the piston each time it moves into the top dead center position.

Abstract: A power assembly for an internal combustion engine includes a cylinder with a circular wall defining a first inside diameter. A piston is reciprocably housed within the cylinder. An integral, unitary piston deposit scraper is formed in a portion of the circular wall of the cylinder by upsetting a portion of the metallic wall so as to configure a piston scraper with a second inside diameter which is less than the first inside diameter. The inside diameter of the piston scraper closely matches that of the outside diameter of the top land of the piston. As a result, the piston scraper removes combustion deposits from the piston each time it moves into the top dead center position.

Abstract: A method for calibrating a fuel injection pump for an engine fuel injection system comprising determining the pressure made available to an injector nozzle at a portion of the injection cycle before the top dead center position of the engine crankshaft. A solenoid-operated control valve establishes a rate of fuel delivery through the injector nozzle. The method calculates a boot current for the valve, which will achieve optimum pressure delivery through the nozzle. An electronic controller for the injection system calibrator relies upon an algorithm to find the lowest and the highest boot current level that will achieve injector stability. The logic of the system will increase the precision of the boot current by repeated substitution of incremental current values to determine an upper limit and a lower limit for the boot current.