Fuel System - Operation and Tests/Timing of Fuel Injection Pump CTM3274 (01JUL99) 220-26 Saran Liter Engines 060799 PN=365 TIMING OF FUEL INJECTION PUMPS ON DIESEL ENGINES USING STROBOSCOPIC LAMP -UN-08MAR95 CD30192 A—Stationary pointer B—Timing sensor C—Timing meter D—Stroboscopic lamp The ever-increasing tightening of the specifications Dynamic timing operation relating to engine exhaust emissions (e.g. smoke level) call for greater accuracy in the timing of the A timing sensor (B) mounted on the nozzle inlet fuel injection pump. measures the pressure variation, and thus the start of fuel injection.
In order to guarantee the specified engine performance, however, it is necessary to measure the Coupled to a timing meter (C), the timing sensor start of fuel injection. pulse signal actuates a stroboscopic lamp (D) which indicates the position of the reference piston on the Static timing pulley, when injection occurs. The static timing of a stationary diesel engine is a The timing meter instantly displays engine speed (in slow process which provides only an approximate rpm) and fuel injection timing (in degrees). reading and usually requires a certain amount of disassembly work.
To obtain the proper timing value, stop engine and rotate the fuel injection pump accordingly within the Dynamic timing slots in its flange. The alternative, dynamic timing of a running diesel engine, involves measuring the angular difference between the start of fuel injection and the top dead center (TDC) position of the reference piston (usually piston No.1). This approach allows more precise timing and can be carried out quickly and simply. CD,3274,G220,15-19-04JAN99 220 26