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Replacement [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. REPLACE INTAKE VALVE GUIDE BUSH 
    1. Heat the cylinder head to 80 to 100°C (176 to 212°F).
    2. Place the cylinder head on wooden blocks.
      WARNING:

      Be sure to wear protective gloves.

    3. Using SST and a hammer, tap out the intake valve guide bushes.
      GTY509905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • SST: 09201-10000 
        1. 09201-01050
      • SST: 09950-70010 
        1. 09951-07100
    4. Using a caliper gauge, measure the intake valve guide bush bore diameter of the cylinder head.

      Standard Intake Valve Guide Bush Bore Diameter

      10.285 to 10.306 mm (0.405 to 0.406 in.)

      If the intake valve guide bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the bush bore to a dimension of 10.335 to 10.356 mm (0.407 to 0.408 in.) to install an O/S 0.05 intake valve guide bush.

      If the intake valve guide bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.

      GTY105116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Select a new intake valve guide bush (STD or O/S 0.05), and measure its diameter.
    6. Machine the bush bore to a diameter of the selected intake valve guide bush.

      Intake Valve Guide Bush Bore Diameter

      Bush Size Bush Bore Diameter
      STD 10.285 to 10.306 mm
      (0.405 to 0.406 in.)
      O/S 0.05 10.335 to 10.356 mm
      (0.407 to 0.408 in.)
    7. Heat the cylinder head to 80 to 100°C (176 to 212°F).
    8. Using SST and a hammer, tap in a new intake valve guide bush to the specified protrusion height.
      GTY512839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Height
      • SST: 09201-10000 
        1. 09201-01050
      • SST: 09950-70010 
        1. 09951-07100

      Standard Protrusion Height

      16.9 to 17.3 mm (0.665 to 0.681 in.)

    9. Using a sharp 5.5 mm reamer, ream the intake valve guide bush to obtain the specified clearance between the intake valve guide bush and valve stem.
      GTY121577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REPLACE EXHAUST VALVE GUIDE BUSH 
    1. Heat the cylinder head to 80 to 100°C (176 to 212°F).
    2. Place the cylinder head on wooden blocks.
      WARNING:

      Be sure to wear protective gloves.

    3. Using SST and a hammer, tap out the exhaust valve guide bushes.
      GTY521358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • SST: 09201-10000 
        1. 09201-01050
      • SST: 09950-70010 
        1. 09951-07100
    4. Using a caliper gauge, measure the exhaust valve guide bush bore diameter of the cylinder head.

      Standard Exhaust Valve Guide Bore Diameter

      10.285 to 10.306 mm (0.405 to 0.406 in.)

      If the exhaust valve guide bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the bush bore to a dimension of 10.335 to 10.356 mm (0.407 to 0.408 in.) to install an O/S 0.05 exhaust valve guide bush.

      If the exhaust valve guide bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.

    5. Select a new exhaust valve guide bush (STD or O/S 0.05), and measure its diameter.
    6. Machine the bush bore to a diameter of the selected exhaust valve guide bush.

      Exhaust Valve Guide Bush Bore Diameter

      Bush Size Bush Bore Diameter
      STD 10.285 to 10.306 mm
      (0.405 to 0.406 in.)
      O/S 0.05 10.335 to 10.356 mm
      (0.407 to 0.408 in.)
    7. Heat the cylinder head to 80 to 100°C (176 to 212°F).
    8. Using SST and a hammer, tap in a new exhaust valve guide bush to the specified protrusion height.
      GTY1082718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Height
      • SST: 09201-10000 
        1. 09201-01050
      • SST: 09950-70010 
        1. 09951-07100

      Standard Protrusion Height

      16.9 to 17.3 mm (0.665 to 0.681 in.)

    9. Using a sharp 5.5 mm reamer, ream the exhaust valve guide bush to obtain the specified clearance between the exhaust valve guide bush and valve stem.
      GTY148932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REPLACE STRAIGHT PIN 
    NOTE:

    It is not necessary to remove the straight pins unless they are being replaced.

    1. Remove the straight pins.
    2. Using a plastic hammer, tap in new straight pins to the specified protrusion height.
      GTY1084416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a for Bank 1 *b for Bank 2
      *c Protrusion Height - -

      Standard Protrusion Height

      8.0 to 10.0 mm (0.315 to 0.394 in.)

  4. REPLACE STUD BOLT 
    NOTE:

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

    1. Using E6 and E8 "TORX" socket wrenches, remove the stud bolts.
    2. Using E6 and E8 "TORX" socket wrenches, install the stud bolts.
      GTY1138134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a for Bank 2 Intake Side *b for Bank 1 Intake Side
      *c for Bank 2 Exhaust Side *d for Bank 1 Exhaust Side
      *e for Bank 2 Front Side *f for Bank 1 Front Side
      *g for Bank 1 Rear Side *h 12 mm (0.472 in.)
      *i 52 mm (2.05 in.) *j 24 mm (0.945 in.)
      *k 13 mm (0.512 in.) *l 45 mm (1.77 in.)
      *m 20 mm (0.787 in.) *n 35 mm (1.38 in.)
      *o 14 mm (0.551 in.) *p 29 mm (1.14 in.)
      *q 9 mm (0.354 in.) *r 19 mm (0.748 in.)
      *s 26 mm (1.02 in.) *t 16.7 mm (0.657 in.)
      *u 51.7 mm (2.04 in.) - -

      Stud Bolt (A), (B), (C), (D), (F) 

      Torque: 9.0 N.m (92 kgf/cm, 80 in.lbf) 

      Stud Bolt (E) 

      Torque: 5.0 N.m (51 kgf/cm, 44 in.lbf) 

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