MOTOR GP-GEAR 3987462 - Caterpillar

Be sure the engine cannot be started while this maintenance is being performed. To prevent possible injury, do not use the starting motor to turn the flywheel.Hot engine components can cause burns. Allow additional time for the engine to cool before measuring/adjusting the unit injectors.The electronic unit injectors use high voltage. Disconnect the unit injector enable circuit connector in order to prevent personal injury. Do not come in contact with the injector terminals while the engine is running.
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.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, "Engine Valve Lash — Inspect/Adjust" for the adjustment procedure.Refer to the Disassembly and Assembly Manual for the procedure applicable for the removal and replacement of the injector.
The camshafts must be correctly timed with the crankshaft before an adjustment of the lash for the fuel injector is made. The timing pins must be removed from the camshafts before the crankshaft is turned or damage to the cylinder block will be the result.