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Adjustment [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. REMOVE FUEL PUMP WITH SEAL SUB-ASSEMBLY (for Bank 1) 

    Refer to REMOVAL [11/2021 - ]

  2. REMOVE FUEL PUMP WITH SEAL SUB-ASSEMBLY (for Bank 2) 

    Refer to REMOVAL [11/2021 - ]

  3. REMOVE IGNITION COIL ASSEMBLY 

    Refer to REMOVAL [11/2021 - ]

  4. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH 

    See step  23

  5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY 

    See step  24

  6. REMOVE OIL REFLECTOR PLATE LH 

    See step  50

  7. REMOVE OIL REFLECTOR PLATE RH 

    See step  54

  8. SET NO. 1 CYLINDER TO TDC/COMPRESSION 
    1. Rotate the crankshaft clockwise so that the timing marks on the crankshaft pulley, camshaft timing intake gear assembly LH, camshaft timing intake gear assembly RH, camshaft timing exhaust gear assembly LH and camshaft timing exhaust gear assembly RH are as shown in the illustration.

      HINT: 

      If the timing marks do not align, rotate the crankshaft clockwise again and align the timing marks.

      GTY1137977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Timing Mark *b Timing Mark Position
      *c Knock Pin Position *d Approximately 2°
      *e Approximately 45° *f Approximately 16°
      *g Upward *h Approximately 20°
      *i Approximately 33° *j Timing Mark (Groove)
  9. INSPECT VALVE CLEARANCE 
    1. Using a feeler gauge, measure the clearance between the indicated No. 1 valve rocker arm sub-assemblies and camshafts.
      GTY1084012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a for Bank 1 *b for Bank 2
      *c Intake Side *d Exhaust Side

      Standard Valve Clearance (Cold)

      Intake 

      0.12 to 0.18 mm (0.00472 to 0.00709 in.)

      Exhaust 

      0.19 to 0.25 mm (0.00748 to 0.00984 in.)

      HINT: 

      • On this engine, valve clearance is measured between the No. 1 valve rocker arm sub-assemblies and the cam lobes. The shims used to adjust the valve clearance are located on the top of the valve stems.
      • The valve clearance shown in the Standard Valve Clearance table is the clearance as measured between the cam lobe and No. 1 valve rocker arm sub-assembly.
      • Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve adjusting shim.
    2. Turn the crankshaft 1 revolution (360°).
    3. Using a feeler gauge, measure the clearance between the indicated No. 1 valve rocker arm sub-assemblies and camshafts.
      GTY1083997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a for Bank 1 *b for Bank 2
      *c Intake Side *d Exhaust Side

      Standard Valve Clearance (Cold)

      Intake 

      0.12 to 0.18 mm (0.00472 to 0.00709 in.)

      Exhaust 

      0.19 to 0.25 mm (0.00748 to 0.00984 in.)

      HINT: 

      • On this engine, valve clearance is measured between the No. 1 valve rocker arm sub-assemblies and the cam lobes. The shims used to adjust the valve clearance are located on the top of the valve stems.
      • The valve clearance shown in the Standard Valve Clearance table is the clearance as measured between the cam lobe and No. 1 valve rocker arm sub-assembly.
      • Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve adjusting shim.
  10. ADJUST VALVE CLEARANCE 
    1. Remove timing chain cover assembly.

      Refer to REMOVAL [11/2021 - ]

    2. Remove the camshafts.

      See step  19

    3. Raise the No. 1 valve rocker arm sub-assembly above the valve adjusting shim being replaced, and remove the valve adjusting shim.
      NOTE:
      • Be careful not to drop the valve adjusting shim into the cylinder head LH and cylinder head sub-assembly.
      GTY496073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Cylinder Head Valve Rocker Arm Pivot
      *2 No. 1 Valve Rocker Arm Sub-assembly
      *3 Valve Adjusting Shim

      HINT: 

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

    4. Using a dial gauge, measure the thickness of the existing valve adjusting shim after removing it.
      GTY1082695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Groove

      HINT: 

      Do not measure at the valve adjusting shim center groove.

    5. Determine the replacement valve adjusting shim thickness according to the formula or following charts.
      T2 Thickness of replacement shim
      T1 Thickness of existing shim
      A Measured valve clearance

      Valve Clearance

      Intake 

      T2 = T1 + (A - 0.15 mm (0.00591 in.)) x 1.7

      Exhaust 

      T2 = T1 + (A - 0.25 mm (0.00984 in.)) x 1.7

      These examples are provided only as calculation examples, based on the clearance adjustment of an intake valve. If non-metric units are being used, substitute those measurements for the following values.
      1. Step 1 - Determining the amount of excess clearance
      2. The specified clearance (0.15) is subtracted from the measured valve clearance (0.40), and the result is then multiplied by the rocker ratio compensation value (1.7).
      3. (Measured valve clearance - Specified clearance) x Compensation value = Amount of excess clearance
      4. (0.40 - 0.15) x 1.7 = 0.425
      1. Step 2 - Using the existing valve adjusting shim to determine the required thickness of the replacement valve adjusting shim
      2. The amount of excess clearance (0.425) is added to the thickness of existing shim (2.300). The resulting value is the thickness of a replacement valve adjusting shim.
      3. Excess clearance + Thickness of existing shim = Thickness of replacement shim
      4. 0.425 + 2.300 = 2.725
      1. Step 3 - Select the valve adjusting shim closest to the thickness of the required replacement shim
      2. Compare the thickness of the available replacement valve adjusting shim to the required replacement shim and choose the shim that is the closest match.
      3. Closest replacement valve adjusting shim = 2.725 (Select a new No. 72 shim.)

      HINT: 

      • Select a replacement shim with a thickness as close to the calculated value as possible.
      • Valve adjusting shims are available in 41 sizes in increments of 0.020 mm (0.000787 in.), from 2.000 mm (0.0787 in.) to 2.800 mm (0.1102 in.).
      • To select a replacement valve adjusting shim, refer to the following Valve Adjusting Shim Selection Chart and New Lifter Thickness tables.

      Valve Adjusting Shim Selection Chart (Intake) 

      GTY1084148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Intake Valve Clearance (Cold)

      0.12 to 0.18 mm (0.00472 to 0.00709 in.)

      EXAMPLE:

      If the thickness of existing shim is 2.300 mm (0.0906 in.), and the measured valve clearance is 0.400 mm (0.0157 in.), then a new 2.720 mm (0.1071 in.) No. 72 shim should be used as a replacement for the existing shim.

      NEW LIFTER THICKNESS MM (IN.)

      Lifter No. Thickness Lifter No. Thickness Lifter No. Thickness
      00 2.000 (0.0787) 28 2.280 (0.0898) 56 2.560 (0.1008)
      02 2.020 (0.0795) 30 2.300 (0.0906) 58 2.580 (0.1016)
      04 2.040 (0.0803) 32 2.320 (0.0913) 60 2.600 (0.1024)
      06 2.060 (0.0811) 34 2.340 (0.0921) 62 2.620 (0.1031)
      08 2.080 (0.0819) 36 2.360 (0.0929) 64 2.640 (0.1039)
      10 2.100 (0.0827) 38 2.380 (0.0937) 66 2.660 (0.1047)
      12 2.120 (0.0835) 40 2.400 (0.0945) 68 2.680 (0.1055)
      14 2.140 (0.0843) 42 2.420 (0.0953) 70 2.700 (0.1063)
      16 2.160 (0.0850) 44 2.440 (0.0961) 72 2.720 (0.1071)
      18 2.180 (0.0858) 46 2.460 (0.0969) 74 2.740 (0.1079)
      20 2.200 (0.0866) 48 2.480 (0.0976) 76 2.760 (0.1087)
      22 2.220 (0.0874) 50 2.500 (0.0984) 78 2.780 (0.1094)
      24 2.240 (0.0882) 52 2.520 (0.0992) 80 2.800 (0.1102)
      26 2.260 (0.0890) 54 2.540 (0.1000) - -

      Valve Adjusting Shim Selection Chart (Exhaust) 

      GTY1084154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Exhaust Valve Clearance (Cold)

      0.19 to 0.25 mm (0.00748 to 0.00984 in.)

      EXAMPLE:

      If the thickness of existing shim is 2.300 mm (0.0906 in.), and the measured valve clearance is 0.400 mm (0.0157 in.), then a new 2.560 mm (0.1008 in.) No. 56 shim should be used as a replacement for the existing shim.

      NEW LIFTER THICKNESS MM (IN.)

      Lifter No. Thickness Lifter No. Thickness Lifter No. Thickness
      00 2.000 (0.0787) 28 2.280 (0.0898) 56 2.560 (0.1008)
      02 2.020 (0.0795) 30 2.300 (0.0906) 58 2.580 (0.1016)
      04 2.040 (0.0803) 32 2.320 (0.0913) 60 2.600 (0.1024)
      06 2.060 (0.0811) 34 2.340 (0.0921) 62 2.620 (0.1031)
      08 2.080 (0.0819) 36 2.360 (0.0929) 64 2.640 (0.1039)
      10 2.100 (0.0827) 38 2.380 (0.0937) 66 2.660 (0.1047)
      12 2.120 (0.0835) 40 2.400 (0.0945) 68 2.680 (0.1055)
      14 2.140 (0.0843) 42 2.420 (0.0953) 70 2.700 (0.1063)
      16 2.160 (0.0850) 44 2.440 (0.0961) 72 2.720 (0.1071)
      18 2.180 (0.0858) 46 2.460 (0.0969) 74 2.740 (0.1079)
      20 2.200 (0.0866) 48 2.480 (0.0976) 76 2.760 (0.1087)
      22 2.220 (0.0874) 50 2.500 (0.0984) 78 2.780 (0.1094)
      24 2.240 (0.0882) 52 2.520 (0.0992) 80 2.800 (0.1102)
      26 2.260 (0.0890) 54 2.540 (0.1000) - -
    6. Install the camshafts.

      See step  1

    7. Inspect the valve clearance again.
      NOTE:

      Be sure to inspect the valve clearance with the chain sub-assemblies installed. If a camshaft is rotated without the chain sub-assembly installed, contact between the valves and pistons may occur.

      HINT: 

      If the valve clearance is not as specified, readjust the valve clearance.

    8. Install the timing chain cover assembly.

      Refer to INSTALLATION [11/2021 - ]

  11. INSTALL OIL REFLECTOR PLATE LH 

    See step  43

  12. INSTALL OIL REFLECTOR PLATE RH 

    See step  44

  13. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY LH 

    See step  58

  14. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY 

    See step  59

  15. INSTALL IGNITION COIL ASSEMBLY 

    Refer to INSTALLATION [11/2021 - ]

  16. INSTALL FUEL PUMP WITH SEAL SUB-ASSEMBLY (for Bank 1) 

    Refer to INSTALLATION [11/2021 - ]

  17. INSTALL FUEL PUMP WITH SEAL SUB-ASSEMBLY (for Bank 2) 

    Refer to INSTALLATION [11/2021 - ]

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