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Home › Cadillac › 2016 › CTS V › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Controls And Fuel - 6.2L (LT4) - Repair Instructions › Repair Instructions › Fuel Injection Fuel Rail Assembly Replacement - Bank 1 › Installation Procedure

Installation Procedure

NOTE: The injector seals should be clean and free of debris prior to installation.
  1. Inspect the fuel injection fuel rail insulators and replace if necessary.
  2. If replacing the fuel injection fuel rail, install the fuel injectors. Refer to Fuel Injector Replacement .
  3. Install EN-51105-1 long protector (3) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a new seal (2) on the EN-51105-1 long protector.
    Fig 1: Identifying Fuel Injector Tip & Seals
    GM2210025Courtesy of GENERAL MOTORS COMPANY
    NOTE: Do NOT use any type of lubricant when installing the NEW seals (2) on the fuel injector.
  4. Using EN-49245-3 pusher (1), install the seal onto the second recessed area (4) of the fuel injector.
  5. Compress the seal with your fingers, then resize the seal using the EN-49245-4 sizer (5).
    NOTE: The EN-49245-4 is two sided and either direction will size the seal correctly.
  6. Install EN-51105-2 short protector (3) onto the fuel injector tip. Place a NEW seal (2) on EN-51105-2 short protector.
    Fig 2: Identifying Fuel Injector Tip & Seals
    GM2219104Courtesy of GENERAL MOTORS COMPANY
    NOTE: Do NOT use any type of lubricant when installing NEW seals (2) on the injector.
  7. Using EN-49245-3 pusher (1), install the seal onto the first recessed area (4) of the fuel injector.
  8. Compress the seal with your fingers, then resize the seal using the EN-49245-4 sizer (5).
    NOTE: The EN-49245-4 is two sided and either direction will size the seal correctly.
  9. Install the NEW fuel injector dust seal (1).
    Fig 3: Fuel Injector Dust Seal
    GM4560526Courtesy of GENERAL MOTORS COMPANY
  10. Install the fuel rail fasteners (1) into the fuel rail (2).
    Fig 4: Fuel Rail Fasteners
    GM3393997Courtesy of GENERAL MOTORS COMPANY
    NOTE: The fuel rail fasteners are retained into the rails using keepers. Care should be taken to ensure that the threadlock is installed after the fasteners are installed in their bore.
  11. Apply a 0.5 mm (0.02 in) band of GM approved threadlock to the threads of the fuel rail fasteners (1). Refer to Adhesives, Fluids, Lubricants and Sealers for approved threadlock part number(s).
  12. Install the fuel injection fuel rail assembly (2) on to the cylinder head.
  13. Start the fuel rail fasteners by hand then draw the injector rail down evenly prior to tightening.
  14. Tighten the fuel rail fasteners (1) to 25 N.m (18 lb ft).
    CAUTION: Refer to Fastener Caution .
  15. If removed, install the fuel injection fuel rail pressure sensor. Refer to Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement .
  16. Connect the electrical wiring harness connectors to the fuel rail.
  17. Install the fuel feed pipe. Refer to Fuel Feed Pipe Replacement .
  18. Install the NEW fuel feed intermediate pipe position 1 and fuel feed intermediate pipe position 2. Refer to Fuel Feed Intermediate Pipe Replacement - Position 1 .
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