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Home › Ford › 2021 › Explorer ST › Repair and Diagnosis › Engine Mechanical › Mechanical › Engine - 3.0L ECOBOOST › Disassembly And Assembly Of Subassemblies › Cylinder Head › Assembly

Cylinder Head: Assembly

All cylinder heads 

  1. NOTE: If a spark plug is dropped, internal damage may result and the spark plug must be discarded. The use of a damaged spark plug may cause cylinder misfire resulting in engine damage.

    Install the spark plugs.

    Torque: 133 lb.in (15 Nm)

    GFD511551Courtesy of FORD MOTOR COMPANY
  2. NOTE: Do not lubricate the new lower Teflon® fuel injector seals.

    1. Install the Arbor on the fuel injector tips. Use Special Service Tool: 310-207 Installer, Fuel Injector Seal Assembly.
    2. NOTE: Once the Teflon® seal is installed on the Teflon® Seal Guide, it should immediately be installed onto the fuel injector to avoid excessive expansion of the Teflon® seal.
      NOTE: Make sure that new lower fuel injector Teflon® seals are installed.

      Install the new Teflon® seals onto the Arbor, using the Pusher Tool (part of the Fuel Injector Seal Installer), slide the Teflon® seals along the Arbor.

    3. Using the Pusher Tool, slide the Teflon® seals off of the Teflon® Seal Guide and into the groove on the fuel injectors. Use Special Service Tool: 310-207 Installer, Fuel Injector Seal Assembly.

    GFD511552Courtesy of FORD MOTOR COMPANY
  3. NOTE: Make sure the Teflon® seal is fully seated in the groove on the fuel injector before sizing the Teflon® seal.

    1. Some Teflon® seal massaging with your fingers before the Teflon® seal sizer tool is installed will aid in installing the Teflon® seal sizer tool.
    2. Position the Teflon® seal sizer tool with the larger opening towards the Teflon® seal. Push while turning the Teflon® seal sizer tool 180 degrees. Use Special Service Tool: 303-1567 Sizer, Teflon Seal.
    3. Once the Teflon® seal sizer tool is installed, check and make sure the Teflon® seal is in the sizing portion of the Teflon® seal sizer tool.
    4. After one minute, turn the Teflon® seal sizer tool back 180 degrees and remove.

    GFD510935Courtesy of FORD MOTOR COMPANY
  4. NOTE: Make sure that NEW fuel injector support rings and NEW fuel injector O-ring seals are installed.

    1. Install the new fuel injector O-rings. The O-rings are pre-lubricated, NO ADDITIONAL lubricant is required.
    2. NOTE: The NEW the fuel injector support rings must be installed in the correct orientation with the wide surface area facing up against the fuel injector O-ring seals. Improperly installed support rings may cause the fuel system to leak.

      Install the NEW the fuel injector support rings.

    3. Inspect the inlet stopper, if it is damaged or comes off then discard the inlet stopper. The inlet stopper is not needed for proper function. Ensure that any debris from the inlet stopper are removed. If the inlet stopper is intact and undamaged do not remove the inlet stopper from the fuel injector.
    4. The upper side of the support ring has the wide surface area.
    5. Fuel injector support ring.
    6. The lower side of the support ring has the narrow surface area.

    GFD511553Courtesy of FORD MOTOR COMPANY
  5. NOTE: Make sure that new fuel injector clips are installed.

    Install the new the fuel injector clips.

    GFD511554Courtesy of FORD MOTOR COMPANY
  6. NOTE: The FRP sensor must be replaced if it is removed from the fuel rail.
    NOTE: The anti-rotation finger of the fuel injector clip must slip into the groove of the fuel rail cup.

    LH shown, RH similar. Install the fuel injectors to the fuel rail.

    GFD511555Courtesy of FORD MOTOR COMPANY
  7. NOTE: LH shown, RH similar.

    Connect the fuel injector electrical connectors.

    GFD511544Courtesy of FORD MOTOR COMPANY
  8. NOTE: Do not lubricate the new lower Teflon® fuel injector seals.
    NOTE: LH shown, RH similar.

    Install the fuel rail, push down on the fuel rail above the fuel injectors, apply an even force to ensure that the fuel rail seats parallel to the cylinder head mounting bosses. Install the bolts and hand tighten until snug.

    Torque: Stage 1: Tighten the bolts one revolution at the time, in the sequence shown, until all of the fuel rail mounting brackets are seated flat on the cylinder head mounting bosses: : 1turn(s) - Stage 2: Tighten in the sequence shown to: : 18 lb.ft (24 Nm)

    GFD511556Courtesy of FORD MOTOR COMPANY
  9. NOTE: LH shown, RH similar.

    Attach the wiring harness retainer.

    GFD511542Courtesy of FORD MOTOR COMPANY
  10. NOTE: Lubricate the new valve stem seal with clean engine oil.

    Install the new valve stem seal. Refer to: SPECIFICATIONS  .

    GFD511557Courtesy of FORD MOTOR COMPANY
  11. NOTE: Lubricate the valve stem with clean engine oil.

    Install the valve into the cylinder head. Refer to: SPECIFICATIONS  .

    GFD511558Courtesy of FORD MOTOR COMPANY
    • Using the special tools, install the spring, retainer and keys. Use Special Service Tool: 303-300 (T87C-6565-A) Set, Valve Spring Compressor, 303-350 (T89P-6565-A) Compressor, Valve Spring, 303-1249 Valve Spring Compressor, 303-1418 Compressor, Valve Spring.

    • Repeat the previous steps for each of the remaining valves.

    GFD511539Courtesy of FORD MOTOR COMPANY

    LH cylinder heads 

  13. NOTE: Do not reuse the CHT sensor, install a new sensor.

    Install a new CHT sensor.

    Torque: 106 lb.in (12 Nm)

GFD511559Courtesy of FORD MOTOR COMPANY
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