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Installation Procedure

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  1. Install a NEW combustion fuel injector seal (1) to the EN-51146-2-2  mounting sleeve-long (2).
    Fig 1: Combustion Fuel Injector Seal And Long Mounting Sleeve
    GM3764347Courtesy of GENERAL MOTORS COMPANY
  2. Use the EN-51146-2-6-1  slider outside (1) to push down the combustion fuel injector seal (2) on the EN-51146-2-2  mounting sleeve-long (3).
    Fig 2: Installing Combustion Seals
    GM2918345Courtesy of GENERAL MOTORS COMPANY
  3. Push the combustion fuel injector seal (2) over the EN-51146-2-2  mounting sleeve-long, use the EN-51146-2-6-1  slider outside (1) to the fuel injector (3).
    Fig 3: Installing Combustion Seals
    GM3764346Courtesy of GENERAL MOTORS COMPANY
  4. Remove the EN-51146-2-2  mounting sleeve-long with the EN-51146-2-1  stylus from the EN-51146-2-6-1  slider outside.
  5. Install a NEW combustion fuel injector seal to the EN-51146-2-3  mounting sleeve-short.
  6. Use the EN-51146-2-6-1  slider outside to push down the combustion fuel injector seal on the EN-51146-2-2  mounting sleeve-short.
  7. Push the combustion fuel injector seal over the EN-51146-2-3  mounting sleeve-short, use the EN-51146-2-6-1  slider outside to the fuel injector.
  8. Remove the EN-51146-2-3  mounting sleeve-short with the EN-51146-2-1  stylus from the EN-51146-2-6-1  slider outside.
  9. Before using the EN-51146 - 2 - 4  pre-sizing tool (1), check if the fuel injector limiter (2) is in the right position.
    Fig 4: Fuel Injector Limiter
    GM3621254Courtesy of GENERAL MOTORS COMPANY
  10. Push the EN-51146-2-4  pre-sizing tool (1) over the fuel injector (2).
    Fig 5: Pre-Sizing Tool And Fuel Injector
    GM2918347Courtesy of GENERAL MOTORS COMPANY
    NOTE: 1st form the combustion fuel injector seals a bit with finger and thumb.
  11. Tighten the nut (2) and counterhold at the spanner flat of the EN-51146-2-4  pre-sizing tool thread (1) until the measure (a) of 4.5 mm (0.177 in) is reached.
    Fig 6: Pre-Sizing Tool
    GM2918354Courtesy of GENERAL MOTORS COMPANY
  12. Loosen the nut (2) of the EN-51146-2-4  pre-sizing tool.
  13. Install the EN-51146-2-4-7  take off chassis (2) to the EN-51146-2-4  pre-sizing tool (3).
    Fig 7: Take Off Chassis And Pre-Sizing Tool
    GM2918355Courtesy of GENERAL MOTORS COMPANY
  14. Install the EN-51146-2-4-6  screw M10 (1) to the EN-51146-2-4-7  take off chassis (2) and tighten until the EN-51146-2-4  pre-sizing tool (3) is loosed.
  15. Install the EN-51146-2-5  calibration tool (2) rotary to the fuel injector (1), as shown in the graphic.
    Fig 8: Calibration Tool And Fuel Injector
    GM2968075Courtesy of GENERAL MOTORS COMPANY
  16. Remove the EN-51146-2-5  calibration tool from the fuel injector.
  17. Check the combustion fuel injector seals (2 seals per fuel injector) for correct seat:
    Fig 9: 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. If the seals are installed incorrectly, it could cause leaks and risk of injury.
    • The seal must not be to large, buckled or corrugated (1).
    • The seal must be fixed tight and accurate (2).
  18. If the seals are installed not correctly, repeat the steps 23 - 25 of the removal procedure and the steps 1 - 18 of the installation procedure.
  19. Install the 4 EN-51146-2-5  calibration tools (2) rotary to the fuel injectors (1).
    Fig 10: Calibration Tools And Fuel Injectors
    GM2918386Courtesy of GENERAL MOTORS COMPANY
  20. Remove the fuel injector assembly with the EN-51146-1-2  plate from the bench vise.
  21. Remove the 8 plate bolts (1) and remove EN-51146-1-2  plate (2), counterhold with a wrench (4) at the EN-51146-1-1  supports (3).
    Fig 11: Plate, Bolts And Supports
    GM2918404Courtesy of GENERAL MOTORS COMPANY
  22. Remove one EN-51146-1-1  support (2) from the fuel injector (3).
    Fig 12: Support, Fuel Injector And Bolt
    GM2918395Courtesy of GENERAL MOTORS COMPANY
    NOTE: Never loosen both EN-51146-1-1  supports at the same time. Failure to follow this caution could cause leaks or malfunction after installation. It is only possible, when the fuel injector will be replaced.
  23. Apply thread lock agent to the NEW fuel injector bolt. Refer to Adhesives, Fluids, Lubricants and Sealers .
    NOTE: DO NOT reuse the old fuel injector bolt.
  24. Install NEW fuel injector bolt (1) to the fuel injector and tighten to 5 N.m (44 lb in).
    CAUTION: Fastener Caution
  25. Remove the EN-51146-1-1  support (1) from the fuel injector (3).
    Fig 13: Support, Fuel Injector And Bolt
    GM2918396Courtesy of GENERAL MOTORS COMPANY
  26. Apply thread lock agent to the NEW fuel injector bolt. Refer to Adhesives, Fluids, Lubricants and Sealers .
    NOTE: DO NOT reuse the old fuel injector bolt.
  27. Install a NEW fuel injector bolt (2) to the fuel injector and tighten to 5 N.m (44 lb in).
  28. Repeat the steps 22 - 27 for the other 3 injectors.
  29. Clean the fuel injector bores at the cylinder head. Refer to Fuel Injector and Fuel Injector Bore Cleaning and Inspection .
  30. Check the fuel injector rail assembly:
    Fig 14: Fuel Injector Rail Assembly
    GM4175028Courtesy of GENERAL MOTORS COMPANY
    • Check the 4 fuel injector (5) for damage.
    • Check the 8 fuel injector seals (4) for correct seat.
    • Check if all bolts (3) with decoupling elements (1) and retainer (2) are complete.
  31. Remove the 4 EN-51146-2-5  calibration tools from the fuel injector.
  32. Fuel Injection Fuel Rail (1) - Install
    Fig 15: Fuel Injection Fuel Rail
    GM4248359Courtesy of GENERAL MOTORS COMPANY
    NOTE: During the installation of the fuel rail and injector assembly, ensure that the fuel injectors are positioned straight into the injector opening. Failure to follow this caution can tilt or bend the injectors and could cause leaks or malfunction after installation.
  33. Push the fuel injectors slightly in their seats.
  34. Tighten the 10 fuel rail bolts (1) in the sequence as shown to 10 N.m (89 lb in).
    Fig 16: Fuel Rail Bolts
    GM4248360Courtesy of GENERAL MOTORS COMPANY
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