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While the maintenance of a diesel engine may be limited primarily to running repairs, and fuel system component replacement due to mileage and time, an often over-looked or under appreciated aspect of traditional injection pump and injector maintenance, is the procurement and monitoring of proper diesel injection timing.  Modern common rail diesels have various methods through computer programming and learned behavior, to dynamically adjust timing throughout the engine's life.  However, older traditional injection technology of the pump-line-injector (PLN) fuel system, relies on mechanical adjustment of the relationship between the time the injector begins to flow fuel, and the piston as...