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Disassembly [11/2021 - 03/2024]: Procedure

WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. REMOVE VALVE SPRING RETAINER LOCK 
    1. GTY1076101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using SST, remove the 16 valve spring retainer locks.
        • SST: 09202-70020 
          1. 09202-01010
          2. 09202-01020
        • SST: 09202-00021 
  2. REMOVE VALVE SPRING RETAINER 
    1. GTY998455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE INTAKE VALVE COMPRESSION SPRING 
    1. GTY998465Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE EXHAUST VALVE COMPRESSION SPRING 
    1. Perform the same procedure as for the intake valve compression spring.
  5. REMOVE INTAKE VALVE 
    1. GTY998469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE EXHAUST VALVE 
    1. Perform the same procedure as for the intake valve.
  7. REMOVE INTAKE VALVE STEM OIL SEAL 
    1. GTY1075170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using needle-nose pliers, remove the 8 intake valve stem oil seals.
  8. REMOVE EXHAUST VALVE STEM OIL SEAL 
    1. Perform the same procedure as for the intake valve stem oil seal.
  9. REMOVE INTAKE VALVE SPRING SEAT 
    1. GTY1075149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using compressed air and a Magnet Hand, remove the 8 intake valve spring seats from the cylinder head sub-assembly by blowing air onto them.
  10. REMOVE EXHAUST VALVE SPRING SEAT 
    1. Perform the same procedure as for the intake valve spring seat.
  11. REMOVE NO. 1 STRAIGHT SCREW PLUG 
    NOTE:

    If coolant leaks from a No. 1 straight screw plug or a plug is corroded, replace it.
    1. GTY1075817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a 6 mm straight hexagon wrench, remove the 4 No. 1 straight screw plugs from the cylinder head sub-assembly.
  12. REMOVE STUD BOLT 
    NOTE:

    If a stud bolt is deformed or its threads are damaged, replace it.
    1. GTY1075355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using an E8 "TORX" socket wrench, remove the 7 stud bolts.
  13. REMOVE INTAKE VALVE GUIDE BUSH 
    1. GTY1073154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Heat the cylinder head sub-assembly to between 80 and 100°C (176 and 212°F).
        WARNING:

        Be sure to wear protective gloves.

      2. Using SST and a hammer, tap out the intake valve guide bush.
        • SST: 09201-01055 
        • SST: 09950-70010 
          1. 09951-07100
  14. REMOVE EXHAUST VALVE GUIDE BUSH 
    1. Perform the same procedure as for the intake valve guide bush.
  15. REMOVE RING PIN 
    NOTE:

    It is not necessary to remove the ring pins unless they are being replaced.
    1. GTY999852Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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