Cummins ISX11.9 CM2250 – Service Manual 006-026   Injector

Record the injector trim codes that are listed on each injector.

Record the cylinder location where each injector will be installed.

NOTE: The injector trim codes are 9-digit alphanumeric codes, located on the solenoid at the top of the injector.

NOTE: There are two different injector hold-down clamps, front bank and rear bank. The cylinder head has a locating hole at each cylinder that is designed to accept the alignment feature for the injector hold-down clamp.

Make sure the injector bore is clean.

Align the notch in the injector with the tab on the injector hold-down clamp.

Place the injector and hold-down clamp in the cylinder head in the proper orientation (fuel inlet toward the high-pressure fuel connector).

Push down on the injector hold-down clamp near the injector to make sure the injector is properly seated.

NOTE: If a new injector is being installed, a new fuel connector must also be used.

Start the injector hold-down clamp capscrew, but do not tighten.

Align the fuel connector guide pin with the slot in the cylinder head at the 12-o’clock position. To prevent damage to the fuel connector, push downward on the threaded end of the fuel connector, to lift the fuel connector tip and help the connector tip seat properly against the injector.

Install the high-pressure fuel connector, making sure the end of the high-pressure fuel connector is in the injector inlet port.

Tighten the injector hold-down clamp capscrew.

NOTE: This is not the final torque for the injector hold-down clamp.

Lubricate the threads on the fuel connector retaining nut with clean engine oil.

Start the high-pressure fuel connector retaining nut and tighten partially.

NOTE: This is not the final torque for the high-pressure fuel connector retaining nut.

Tighten the injector hold-down clamp capscrew.

Tighten the high-pressure fuel connector retaining nut.