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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 1.5L (LYX)) >> Repair Instructions - Off Vehicle >> Fuel Rail And Injectors Installation >> Fuel Injector Combustion Seal Installation Procedure

Fuel Injector Combustion Seal Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Installing Combustion Seals
    GM3709767Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT use any type of lubricant when installing the NEW combustion seals on the fuel injector tip.

    NOTE:

    The injector tip protectors in the EN-49245 set are too small for some injectors. Ensure EN-51105 is used on injector tips during seal installation. The pusher and final sizer work for all injectors.

  1. Install EN-51105-1  long protector (1) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a NEW seal (2) on EN-51105-1  long protector (1).
  2. Using EN-49245-3  pusher (3), install the seal (2) into the recessed area of the fuel injector.
  3. Compress the seal (2) with your fingers.
  4. Install EN-51105-2  short protector (4) onto the fuel injector tip. Place a NEW seal (5) on EN-51105-2  short protector (4).
  5. Using EN-49245-3  pusher (3), install the seal (5) into the last recessed area of the fuel injector.
  6. Compress the seal (5) with your fingers.
    7. Fig 2: Pre-Sizing Tool
    GM3709768Courtesy of GENERAL MOTORS COMPANY
  7. Push the EN-51146-2-4  pre-sizing tool (1) over the fuel injector tip.
  8. Tighten the nut (2) and counterhold at the spanner flat (3) of the EN-51146-2-4  pre-sizing tool (1) until the measure (a) of 4.5 mm (0.177 in) is reached.
  9. Loosen the nut (2) of the EN-51146-2-4  pre-sizing tool.
  10. Install the EN-51146-2-4-7  take off chassis (4) to the EN-51146-2-4  pre-sizing tool (1).
  11. Install the EN-51146-2-4-6  screw M10 (5) to the EN-51146-2-4-7  take off chassis (4) and tighten until the EN-51146-2-4  pre-sizing tool (1) is loosened.
    12. Fig 3: Sizer
    GM3709770Courtesy of GENERAL MOTORS COMPANY
  12. Install the EN-49245-4  sizer (1) in a rotary motion to the fuel injector tip in order to complete the combustion seal final sizing.
    13. Fig 4: Installing Seal
    GM2918356Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel injector seals must fit properly in the relative groove. Overlapping of the fuel injector seals with the external surface of the injector must be avoided.

  13. Check both of the fuel injector combustion seals on each fuel injector for correct seat:
    • The seal must not be too large, buckled, or corrugated (1)
    • The seal must be fixed tight and accurate (2)
  14. If the seals are not installed correctly, remove the incorrect seal and replace with a NEW seal.
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