LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 266 (Engine Mechanical System - Service Information (3 Of 3)) >> Cylinder Head >> Disassembly [11/2022 - 09/2024] >> Procedure

Disassembly [11/2022 - 09/2024]: Procedure

WARNING: This page is about a different car, the 2025 Toyota GR Corolla, 2024 Toyota GR Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. REMOVE INTAKE VALVE 
    1. Using SST, compress each intake valve compression spring and remove the 6 valve spring retainer locks.
      GTY1019704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • SST: 09202-70020 
        1. 09202-01010
        2. 09202-01020
      • SST: 09202-00021 

      HINT: 

      Arrange the removed parts in such a way that they can be reinstalled to their original locations.

    2. Remove the 6 valve spring retainers, 6 intake valve compression springs and 6 intake valves from the cylinder head sub-assembly.

      HINT: 

      Arrange the removed parts in such a way that they can be reinstalled to their original locations.

  2. REMOVE EXHAUST VALVE 
    WARNING:
    • The exhaust valve is encapsulated with metallic sodium. The metallic sodium is a strong alkaline and prone to cause a serious chemical reaction. Therefore, extra caution is required when handling or disposing the exhaust valve.
    • Never disassemble the exhaust valve. The metallic sodium may cause blindness if it gets into your eyes, or cause burn injuries or chemical reactions resulting in fire if it comes into contact with your skin or any heat source.
    • Make sure to wear safety glasses and protective gloves when removing a damaged exhaust valve.
    • Do not intentionally damage the exhaust valve to remove the metallic sodium.

    HINT: 

    • The sodium inside the exhaust valve is safe as long as the sodium is not exposed to air.
    • Exhaust valves filled with sodium can be identified by confirming the "NA" identification mark.
    1. Using SST, compress each exhaust valve compression spring and remove the 6 valve spring retainer locks.
      GTY1019655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • SST: 09202-70020 
        1. 09202-01010
        2. 09202-01020
      • SST: 09202-00021 

      HINT: 

      Arrange the removed parts in such a way that they can be reinstalled to their original locations.

    2. Remove the 6 valve spring retainers, 6 exhaust valve compression springs and 6 exhaust valves from the cylinder head sub-assembly.

      HINT: 

      Arrange the removed parts in such a way that they can be reinstalled to their original locations.

  3. REMOVE VALVE STEM OIL SEAL 
    1. Using needle-nose pliers, remove the 12 valve stem oil seals.
      GTY1019295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE VALVE SPRING SEAT 
    1. Using compressed air and a Magnet Hand, remove the 12 valve spring seats from the cylinder head sub-assembly by blowing air onto them.
      GTY1020354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE NO. 1 STRAIGHT SCREW PLUG 
    NOTE:

    If coolant leaks from a No. 1 straight screw plug or a plug is corroded, replace it.

    GTY1019302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using a 6 mm straight hexagon wrench, remove the 2 No. 1 straight screw plugs from the cylinder head sub-assembly.
  6. REMOVE NO. 2 STRAIGHT SCREW PLUG 
    NOTE:

    If coolant leaks from a No. 2 straight screw plug or a plug is corroded, replace it.

    1. Using a 10 mm straight hexagon wrench, remove the No. 2 straight screw plug and gasket from the cylinder head sub-assembly.
      GTY1019300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE STUD BOLT 
    NOTE:

    If a stud bolt is deformed or its threads are damaged, replace it.

    1. Using an E8 "TORX" socket wrench, remove the 9 stud bolts.
      GTY1020133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE STRAIGHT PIN 
    NOTE:

    If a straight pin is deformed or its threads are damaged, replace it.

    1. Remove the 2 straight pins.
      GTY1020131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. DISPOSE OF EXHAUST VALVE 
    WARNING:
    • The exhaust valve is encapsulated with metallic sodium. The metallic sodium is a strong alkaline and prone to cause a serious chemical reaction. Therefore, extra caution is required when handling or disposing the exhaust valve.
    • Never disassemble the exhaust valve. The metallic sodium may cause blindness if it gets into your eyes, or cause burn injuries or chemical reactions resulting in fire if it comes into contact with your skin or any heat source.
    • Make sure to wear safety glasses and protective gloves when removing a damaged exhaust valve.
    • Do not intentionally damage the exhaust valve to remove the metallic sodium.
    NOTE:

    If it is known that the method of industrial waste disposal is a melting type method and not a press type method, then disposal is permitted. If the valve is damaged, remove the valve from the cylinder head and perform the neutralization process, then dispose of the valve using the same process as for ordinary steel.

    HINT: 

    • The sodium inside the exhaust valve is safe as long as the sodium is not exposed to air.
    • The exhaust valve in which metallic sodium is encapsulated can be identified with the embossed mark.
      GTY1251435Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Preparation for neutralization process
      WARNING:

      Always carry out the following when performing the disposal procedure.

      • Ensure a fire extinguisher is at hand.
      • Wear safety glasses.
      • Wear protective gloves.
    2. Neutralization process
      1. Wear protective gloves and then remove the damaged valve from the cylinder head.
      2. Place a large container (bucket or other container) in a well-ventilated area and fill it with water (at least 10 liters).
      3. Place the damaged exhaust valve inside the container in an upright position using large pliers or similar tool to submerge it under water.
        GTY386198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WARNING:
        • Ensure the damaged exhaust valve is fully submerged in water.
        • Keep any fire sparks or fire sources away from this container because hydrogen gas will be emitted from the chemical reaction.
        • Because of serious chemical reaction, step back at least 2 to 3 m from the container.
      4. After the chemical reaction has completed (approximately 4 to 5 hours), using large pliers or similar tool, carefully remove the valve from the container, and then dispose of it according to the same procedures that are provided for other parts.
        WARNING:
        • After the chemical reaction, be careful not to let used liquid (sodium hydrate) contact your skin. Should it contact your skin, immediately rinse it with plenty of water.
        • After the chemical reaction, dispose of used liquid (sodium hydrate) according to all applicable government and local regulations.
scientia non olet · About LEMON Manuals