SEBU7899-05 75 Maintenance Section Driven Equipment - Check Refer to the Disassembly and Assembly Manual, “Vibration Damper and Pulley - Remove and Install” or consult your Caterpillar dealer for information about damper replacement. i04230004 Electronic Unit Injector - Check/Replace SMCS Code: 1251-510; 1251-535; 1290-510; 1290-535 i00934883 Driven Equipment - Check SMCS Code: 3279-535 Be sure the engine cannot be started while this maintenance is being performed. To prevent pos- sible injury, do not use the starting motor to turn the flywheel.
Check the Alignment To minimize bearing problems and vibration of the engine crankshaft and the driven equipment, the alignment between the engine and driven equipment must be properly maintained. Hot engine components can cause burns. Allow additional time for the engine to cool before mea- suring/adjusting the unit injectors. Check the alignment according to the instructions that are provided by the following manufacturers: The electronic unit injectors use high voltage. Dis- connect the unit injector enable circuit connector in order to prevent personal injury. Do not come in contact with the injector terminals while the en- gine is running.
Caterpillar OEM of the drive coupling OEM of the driven equipment The operation of a Cat Engine with an electronic unit injector which is improperly adjusted may reduce engine efficiency. This reduced efficiency may result in excessive fuel usage and/or shortened engine component life. Torque all of the fasteners to the proper specifications. Inspect the Drive Coupling Inspect the drive coupling according to the instructions that are provided by the OEM of the coupling. For the following service information, see the literature that is provided by the OEM of the coupling: Note: Only qualified service personnel should perform this maintenance.
Refer to the Systems Operation, Testing and Adjusting, “Electronic Unit Injector - Test” for the test procedure. Refer to Systems Operation, Testing and Adjusting, “Electronic Unit Injector - Adjust” for the adjustment procedure. Lubrication requirements Specifications for the end play Refer to the Disassembly and Assembly Manual for the procedure for the removal and replacement of the injector. “Reusability Guidelines” Replacement instructions Inspect the Rear Gear Train NOTICE The camshafts must be correctly timed with the crank- shaft before an adjustment of the lash for the fuel in- jector is made.
The timing pins must be removed from the camshafts before the crankshaft is turned or dam- age to the cylinder block will be the result. Inspect the crankshaft gear. If excessive wear is found, replace the crankshaft gear and the large cluster idler. If any gear causes damage to other gears through failure, replace the entire rear gear train. For the correct parts, see the Parts Manual for the engine. For removal and replacement instructions, see the Service Manual, “Disassembly and Assembly” module. Consult your Caterpillar dealer for assistance.