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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System & Fuel System - 6.6L (LLY) - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Injector Replacement (Left) >> Injector Bore Cleaning

Injector Bore Cleaning

WARNING: This page is about a different variant/trim than selected.
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.
    3. 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.
    7. CAUTION: Wear safety glasses in order to avoid eye damage.
  7. Using compressed air, evacuate any debris from the injector bore.
    8. NOTE: 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.
    10. 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.
    1. Remove the glow plugs. Refer to Glow Plug Replacement - Bank 1  and/or Glow Plug Replacement - Bank 2 .
    2. Disable the fuel system.
    3. Disconnect the crankshaft position (CKP) sensor electrical connector.
    4. Crank the engine in order to expel any excessive solvent.
    5. Using the cotton swabs supplied with the kit, wipe the injector bore clean of any solvent and/or debris.
    6. Connect the CKP sensor electrical connector.
    7. Enable the fuel system.
    8. Reinstall the glow plugs. Refer to Glow Plug Replacement - Bank 1  and/or Glow Plug Replacement - Bank 2 .
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