BLOCK-CYL 2W5206 - 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.
Only qualified service personnel should perform this maintenance. Refer to the following topics for your machine for the correct checking procedure and for the correct adjustment procedure.
Engine Systems Operation, Testing and Adjusting, "Electronic Unit Injector - Test"
Engine Systems Operation, Testing and Adjusting, "Electronic Unit Injector - Adjust"The operation of Caterpillar engines with improper adjustments of the electronic unit injector can reduce engine efficiency. This reduced efficiency could result in excessive fuel usage and/or shortened engine component life.