Master

Celect (Cummins Electronic Control) & Celect Plus Injector Adjustment
Name: ________________________________ Date: ________________________________ Cummins CELECT and CELECT Plus system injectorsare used on Cummins electronically controlled engines between 1990 and 2001 in L, M & N series engines. Injector adjustment is accomplished by applying the correct preload to the timing plunger of theinjector when the engine is at 45-degrees before TDC.

1. Injector hold-down bolts should have been previously torqued down to 45-Ft/lbs – verify proper hold-down torque. Rotate engine to valve setmarks on accessory drive pulley for cylinder you will adjust valves and injectors.

2. Identify the cylinder and correct rocker arms for adjustment. • There are three housings on an N-14. • Theintake levers are located near the center of the rocker housings and the exhaust levers closest to the outside of each housing. • Adjust both valves per specification on engine data plate.

3. Theinjectors are adjusted at the same time as the valves. Use the accompanying chart to determine which cylinder to adjust. Both valves must be closed on the cylinder you are adjusting the valves. The rockerlevers will move from side to side.

List the companion cylinder for each of the following cylinders: 1- ___ 2 -___ 3-__4-___ 5-___ 6-___ What valve or injectors can be adjusted in each of thefollowing accessory drive positions? A _______ B______ C______ 4. Injectors are adjusted using the following method: • Bottom the injector plunger out three or four times to remove fuel beneath the timingplunger by tightening and loosening the injector adjustment screw. Do not tighten more than 25 in-lbs. • Tighten the adjusting screw to 25 in-lbs. • Back-out adjusting screw 2 flats or 120 degrees. •Lock the lock nut. 5. Reinstall engine brake housings and torque to 75 ft-lbs

6. Adjust engine brakes using the dial indicator method. • Identify the correct slave piston to adjust. All engine...