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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Mechanical System (A25A-FXS) - Service Information (3 Of 3)) >> Cylinder Head >> Reassembly [12/2019 - ] >> Procedure

Reassembly [12/2019 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSTALL SPARK PLUG TUBE 

    HINT: 

    When using a new cylinder head sub-assembly, the spark plug tubes must be replaced.

    1. Apply adhesive to a new spark plug tube as shown in the illustration.
      GTY749855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Adhesive
      *b Application Width
      *c Distance

      Adhesive

      Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent

      Standard Application Width

      1.0 to 7.0 mm (0.0394 to 0.276 in.)

      Distance

      1.0 mm (0.0394 in.)

      NOTE:
      • Install the spark plug tube within 3 minutes of applying adhesive.
      • Be careful not to deform the spark plug tube.
      • Do not expose the spark plug tube to engine oil for at least 1 hour after installing it.
    2. Using a wooden block and hammer, tap in the 4 spark plug tubes to the specified protrusion height.
      GTY748024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Protrusion Height

      Standard Protrusion Height

      75.7 to 76.7 mm (2.98 to 3.02 in.)

      NOTE:

      To avoid tapping in the spark plug tube too far, measure the protrusion height while tapping it.

  2. INSTALL STUD BOLT 
    NOTE:

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

    1. Using an E8 "TORX" socket wrench, install the 7 stud bolts.
      GTY752771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 20 mm (0.787 in.)
      *b 35 mm (1.38 in.)
      *c 13 mm (0.512 in.)

      Torque: 6.5 N.m (66 kgf/cm, 58 in.lbf) 

  3. INSTALL NO. 1 STRAIGHT SCREW PLUG 

    HINT: 

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

    1. Apply adhesive to the 4 No. 1 straight screw plugs.

      Adhesive

      Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent

      NOTE:

      Install the No. 1 straight screw plugs within 3 minutes of applying adhesive.

    2. Using a 6 mm straight hexagon wrench, install the 4 No. 1 straight screw plugs to the cylinder head sub-assembly.
      GTY756889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 25 N.m (255 kgf/cm, 18 ft.lbf) 

  4. INSTALL INTAKE VALVE SPRING SEAT 
    1. Install the 8 intake valve spring seats to the cylinder head sub-assembly.
  5. INSTALL EXHAUST VALVE SPRING SEAT 
    1. Install the 8 exhaust valve spring seats to the cylinder head sub-assembly.
  6. INSTALL VALVE STEM OIL SEAL 
    1. Apply a light coat of engine oil to 16 new valve stem oil seals.
      GTY755446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Intake Valve Stem Oil Seal
      *b Exhaust Valve Stem Oil Seal
      *c Gold
      *d Gray
      NOTE:

      Make sure to install each valve stem oil seal to the correct side. Installing an intake valve stem oil seal to the exhaust side or installing an exhaust valve stem oil seal to the intake side can cause installation problems later.

      HINT: 

      The intake valve stem oil seals are gold and the exhaust valve stem oil seals are gray.

    2. Using SST, push in the 16 valve stem oil seals.
      GTY754372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Correct
      *b Incorrect
      • SST: 09201-41020 
      NOTE:
      • Failure to use SST will cause the valve stem oil seals to be damaged or improperly seated.
      • Do not push in the valve stem oil seals at an angle.
  7. INSTALL INTAKE VALVE 
    1. Sufficiently apply engine oil to the tip area of the intake valve shown in the illustration.
      GTY759784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 30 mm (1.18 in.) or more
    2. Install the 8 intake valves, 8 intake valve compression springs and 8 valve spring retainers to the cylinder head sub-assembly.
      NOTE:

      Install the same parts in the same combination to their original locations.

    3. Using SST, compress each intake valve compression spring and install the 8 valve spring retainer locks.
      • SST: 09202-70020 
        1. 09202-01010
        2. 09202-01020
      • SST: 09202-00021 
      GTY757562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using a plastic hammer, lightly tap the valve stem tip to ensure a proper fit.
      NOTE:
      • Be careful not to damage the valve stem tip.
      • Be careful not to damage the valve spring retainer.
      GTY756867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSTALL EXHAUST VALVE 
    1. Sufficiently apply engine oil to the tip area of the exhaust valve shown in the illustration.
      GTY744934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 30 mm (1.18 in.) or more
    2. Install the 8 exhaust valves, 8 exhaust valve compression springs and 8 valve spring retainers to the cylinder head sub-assembly.
      NOTE:

      Install the same parts in the same combination to their original locations.

    3. Using SST, compress each exhaust valve compression spring and install the 8 valve spring retainer locks.
      • SST: 09202-70020 
        1. 09202-01010
        2. 09202-01020
      • SST: 09202-00021 
      GTY749434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using a plastic hammer, lightly tap the valve stem tip to ensure a proper fit.
      NOTE:
      • Be careful not to damage the valve stem tip.
      • Be careful not to damage the valve spring retainer.
      GTY757624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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