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How to Replace Injectors in a GMC Duramax Diesel

General Motors has manufactured a series of diesel engines under the Duramax brand since 2001. The primary application for these eight-cylinder, 6.6-liter engines is in heavy trucks requiring low-end torque, like full-size Chevrolet pickups and vans. A Duramax diesel engine uses fuel injectors to send fuel to the cylinders under high pressure. The replacement of the fuel injectors is a relatively simple process, but it also requires the removal of various components to access the injectors.

Instructions

1

Disconnect the negative battery cable with a socket wrench and drain the coolant from the radiator into a suitable container. Detach the electrical connector for the air cooler from the left side of the turbocharger. Unplug the barometric sensors electrical connector.

2

Disconnect the clip for the wiring harness on the engine, and remove the wiring harness bracket with a socket wrench. Unplug the electrical connector for the glow plug. Disconnect the positive crankcase ventilation hose from the left side of the crankcase.

3

Use a socket wrench to disconnect the air cleaner outlet duct from the right side of the engine. Loosen the clamps on the hose to the air intake on the right side of the engine and remove the hose. Disconnect the fuel filter and fuel filter bracket from the right side of the engine. Disconnect the fuel injector control module.

4

Blow compressed air on the fuel lines for the fuel injector. Clean the fuel lines with a shop rag.

5

Detach the fuel send and return lines from the fuel injectors. Unplug the electrical connector from the fuel injector. Disconnect the bolts on the fuel injector bracket, and install injector removal tool J-46594 into one of the bolt holes. Attach a flare nut wrench to the other end of the injector removal tool and pull the flare nut wrench to unseat the fuel injector.

6

Lift the fuel injector from its bore. Discard the O-rings and copper washer for the fuel injector.

7

Mount a new copper washer and O-rings to the new fuel injector. Install the fuel injector, and tighten the bolts on the fuel injector bracket to 22 foot-pounds with a torque wrench. Attach the electrical connector and fuel lines to the fuel injectors. Torque the mounting bolts for the fuel lines to 30 foot-pounds.

8

Complete the installation of the fuel injectors by performing steps 1 through 3 in reverse order. Refill the coolant in the radiator. Start the engine and check for any fluid leaks.