Fuel Injector Replacement Left

Tools Required

1. Remove the left fuel injection fuel feed pipes. Refer to Fuel Injection Fuel Feed Pipe Replacement - Left Side .
2. Remove the left fuel injection fuel return pipe. Refer to Fuel Injection Fuel Return Pipe Replacement - Left Side .

Notice: Label all the injector electrical connectors before the connectors are removed in order to prevent reconnecting to the wrong injector. Failure to properly connect the injectors in the correct sequence will cause severe engine damage.

3. Disconnect the engine wiring harness electrical connectors from the fuel injectors.



4. Remove the fuel injector bracket bolts.



5. Install the J-46594 (1) into the bolt hole in the fuel injector bracket.
6. Install a flare nut wrench onto the J-46594 and pull back away from the fuel injector, until the injector releases from its seat.
7. Remove the J-46594 .



8. Remove the fuel injectors with brackets.



9. If necessary, remove the fuel injector bracket pins.
10. Remove and discard the copper washer from the fuel injector bore.
11. Remove and discard the O-ring from the fuel injector.

Important: If reusing the old injectors perform the following:

1. Use a soft bristle non-metallic brush and Top Engine Cleaner, GM P/N 1052626 or equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing area (2) before re-installation.
2. Inspect the fuel injector nozzle tip (1) for any signs of discoloration (dark yellow, tan or blue) due to excessive heat.
3. Replace the injector if any damage is found.



4. Clean the fuel injector high pressure line.
5. Inspect the fuel injector line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.

Important: The procedure below will aid in the cleaning of carbon deposits from the injector sleeve during an injector replacement

1. Install the EN-47909-2 Radial Brush (brass), to the EN-47909-1 Handle Assembly.
2. Insert the brush into the injector bore and rotate the handle in order to break loose any carbon deposits from the injector bore walls and the combustion deck hole.

Caution: Wear safety glasses in order to avoid eye damage.

3. Using compressed air, evacuate any debris from the injector bore.
4. Remove the radial brush from the handle assembly.
5. Install the EN-47909-3 Axial Brush (nylon), to the EN-47909-1.
6. Insert the axial brush into the injector bore and rotate the handle while also applying a slight downward pressure, in order to force the brush ends into the bottom corners of the injector bore.

Caution: Wear safety glasses in order to avoid eye damage.

7. Using compressed air, evacuate any debris from the injector bore.

Notice: Do not allow excessive amounts of solvent to go into the cylinder during cleaning. Failure to do so may cause engine damage upon startup.

8. Lightly dampen EN-47909-20 Cotton Swab with Top Engine Cleaner, GM P/N 1052626 (Canadian P/N 993026) or equivalent, and wipe away any deposits from the injector bore.
9. Inspect the injector bore for any deposits and repeat brushing if necessary.

Caution: Keep hands and face clear of glow plug holes while cranking. Hot liquid or gases may be expelled during cranking.

Caution: Wear safety glasses in order to avoid eye damage.

10. If necessary, crank the engine in order to expel any solvent before starting the engine.

10.1.

Remove the glow plugs. Refer to Glow Plug Replacement - Bank 1 and/or Glow Plug Replacement - Bank 2 .

10.2.

Disable the fuel system.

10.3.

Disconnect the crankshaft position (CKP) sensor electrical connector.

10.4.

Crank the engine in order to expel any excessive solvent.

10.5.

Using the cotton swabs supplied with the kit, wipe the injector bore clean of any solvent and/or debris.

10.6.

Connect the CKP sensor electrical connector.

10.7.

Enable the fuel system.

10.8.

Reinstall the glow plugs. Refer to Glow Plug Replacement - Bank 1 and/or Glow Plug Replacement - Bank 2 .

1. Install a NEW copper washer to the fuel injector bore.
2. Install a NEW O-ring onto the fuel injector.
3. If necessary, install the fuel injector bracket pins.



4. Install the fuel injectors with brackets.

Notice: Refer to Fastener Notice in the Preface section.




5. Install the fuel injector bracket bolts.

Tighten
Tighten the bolts to 30 N·m (22 lb ft).




6. Connect the engine wiring harness electrical connectors to the fuel injectors.
7. Install the left fuel injection fuel return pipe. Refer to Fuel Injection Fuel Return Pipe Replacement - Left Side .
8. Install the left fuel injection fuel feed pipes. Refer to Fuel Injection Fuel Feed Pipe Replacement - Left Side .
9. If the fuel injectors were replaced, refer to Fuel Injector Flow Rate Programming .
10. Prime the fuel system. Refer to Fuel System Priming .
11. Start the engine. If the engine stalls, repeat the above step.
12. Once the engine starts, inspect for fuel leaks.

Fuel Injector Replacement Right

Tools Required

1. Remove the right fuel injection fuel feed pipes. Refer to Fuel Injection Fuel Feed Pipe Replacement - Right Side .
2. Remove the right fuel injection fuel return pipe. Refer to Fuel Injection Fuel Return Pipe Replacement - Right Side .

Notice: Label all the injector electrical connectors before the connectors are removed in order to prevent reconnecting to the wrong injector. Failure to properly connect the injectors in the correct sequence will cause severe engine damage.

3. Disconnect the engine wiring harness electrical connectors from the fuel injectors.



4. Remove the engine wiring harness clip (1) from the wiring harness bracket and remove the bracket (2).



5. Remove the engine wiring harness clips from the wiring harness bracket.
6. Remove the engine wiring harness bracket bolts (1) and bracket.



7. Remove the engine wiring harness clip from the oil level indicator tube bracket (2).
8. Remove the oil level indicator tube bolt (3).
9. Remove the oil level indicator tube bracket bolts (1).
10. Remove the oil level indicator tube bracket (2).



11. Remove the fuel injector bracket bolts.



12. Install the J-46594 (1) into the bolt hole in the fuel injector bracket.
13. Install a flare nut wrench onto the J-46594 and pull back away from the fuel injector, until the injector releases from its seat.
14. Remove the J-46594 .



15. Remove the fuel injectors with brackets.



16. If necessary, remove the fuel injector bracket pins.
17. Remove and discard the copper washer from the fuel injector bore.
18. Remove and discard the O-ring from the fuel injector.

Important: If reusing the old injectors perform the following:

1. Use a soft bristle non-metallic brush and Top Engine Cleaner, GM P/N 1052626 or equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing area (2) before re-installation.
2. Inspect the fuel injector nozzle tip (1) for any signs of discoloration (dark yellow, tan or blue) due to excessive heat.
3. Replace the injector if any damage is found.



4. Clean the fuel injector high pressure line.
5. Inspect the fuel injector line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.

Important: The procedure below will aid in the cleaning of carbon deposits from the injector sleeve during an injector replacement

1. Install the EN-47909-2 Radial Brush (brass), to the EN-47909-1 Handle Assembly.
2. Insert the brush into the injector bore and rotate the handle in order to break loose any carbon deposits from the injector bore walls and the combustion deck hole.

Caution: Wear safety glasses in order to avoid eye damage.

3. Using compressed air, evacuate any debris from the injector bore.
4. Remove the radial brush from the handle assembly.
5. Install the EN-47909-3 Axial Brush (nylon), to the EN-47909-1.
6. Insert the axial brush into the injector bore and rotate the handle while also applying a slight downward pressure, in order to force the brush ends into the bottom corners of the injector bore.

Caution: Wear safety glasses in order to avoid eye damage.

7. Using compressed air, evacuate any debris from the injector bore.

Notice: Do not allow excessive amounts of solvent to go into the cylinder during cleaning. Failure to do so may cause engine damage upon startup.

8. Lightly dampen EN-47909-20 Cotton Swab with Top Engine Cleaner, GM P/N 1052626 (Canadian P/N 993026) or equivalent, and wipe away any deposits from the injector bore.
9. Inspect the injector bore for any deposits and repeat brushing if necessary.

Caution: Keep hands and face clear of glow plug holes while cranking. Hot liquid or gases may be expelled during cranking.

Caution: Wear safety glasses in order to avoid eye damage.

10. If necessary, crank the engine in order to expel any solvent before starting the engine.

10.1.

Remove the glow plugs. Refer to Glow Plug Replacement - Bank 1 and/or Glow Plug Replacement - Bank 2 .

10.2.

Disable the fuel system.

10.3.

Disconnect the crankshaft position (CKP) sensor electrical connector.

10.4.

Crank the engine in order to expel any excessive solvent.

10.5.

Using the cotton swabs supplied with the kit, wipe the injector bore clean of any solvent and/or debris.

10.6.

Connect the CKP sensor electrical connector.

10.7.

Enable the fuel system.

10.8.

Reinstall the glow plugs. Refer to Glow Plug Replacement - Bank 1 and/or Glow Plug Replacement - Bank 2 .

1. Install a NEW copper washer to the fuel injector bore.
2. Install a NEW O-ring onto the fuel injector.
3. If necessary, install the fuel injector bracket pins.



4. Install the fuel injectors with brackets.

Notice: Refer to Fastener Notice in the Preface section.




5. Install the fuel injector bracket bolts.

Tighten
Tighten the bolts to 30 N·m (22 lb ft).




6. Position the oil level indicator tube bracket (2) to the generator bracket.
7. Install the oil level indicator tube bracket bolts (1).

Tighten
Tighten the bolts to 21 N·m (15 lb ft).

8. Install the oil level indicator tube bolt (3).

Tighten
Tighten the bolt to 21 N·m (15 lb ft).

9. Install the wiring harness clip to the oil level indicator tube bracket (2).



10. Position the engine wiring harness bracket onto the upper valve rocker arm cover and install the bolts (1).

Tighten
Tighten the bolts to 21 N·m (15 lb ft).

11. Install the engine wiring harness clips to the wiring harness bracket.



12. Position the engine wiring harness bracket (2) onto the upper valve rocker arm cover and install the engine wiring harness clip (1) to the wiring harness bracket.



13. Connect the engine wiring harness electrical connectors to the fuel injectors.
14. Install the right fuel injection fuel return pipe. Refer to Fuel Injection Fuel Return Pipe Replacement - Right Side .
15. Install the right fuel injection fuel feed pipes. Refer to Fuel Injection Fuel Feed Pipe Replacement - Right Side .
16. If the fuel injectors were replaced, refer to Fuel Injector Flow Rate Programming .
17. Prime the fuel system. Refer to Fuel System Priming .
18. Start the engine. If the engine stalls, repeat the above step.
19. Once the engine starts, inspect for fuel leaks.