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Inspection [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY 
    1. Turn the roller by hand to check that it turns smoothly.
      GTY653370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. If the roller does not turn smoothly, replace the No. 1 valve rocker arm sub-assembly.
  2. INSPECT VALVE LASH ADJUSTER ASSEMBLY 
    NOTE:
    • Keep the valve lash adjuster assembly free from dirt and foreign matter.
    • Only use clean engine oil.

    Pre-procedure1

    • Place the valve lash adjuster assembly into a container filled with engine oil.
    • Insert the tip of SST into the plunger and use the tip to press down on the check ball inside the plunger.
      GTY452784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Tapered Path
      *b Plunger
      *c Check Ball
      *d Correct
      *e Incorrect
      *f Low Pressure Chamber
      *g High Pressure Chamber
      • SST: 09276-75010 
    • Squeeze SST and the valve lash adjuster assembly together to move the plunger up and down 5 to 6 times.
    • Check the movement of the plunger and bleed any air.

      OK

      Plunger moves up and down.

      NOTE:

      When bleeding the air from the high pressure chamber, make sure that the tip of SST is pressing the check ball as shown in the illustration. If the check ball is not pressed, air will not bleed.

    • After bleeding the air, remove SST. Then try to quickly and firmly press the plunger by hand.

      OK

      Plunger is very difficult to move.

    • If the plunger is easy to move, replace the valve lash adjuster assembly.

    Post-procedure1

    • None
  3. INSPECT CAMSHAFT 
    1. Inspect the camshaft for runout.
      1. Place the camshaft on V-blocks.
      2. Using a dial indicator, measure the runout at the center journal.
        GTY681507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Maximum Runout

        Specified Condition Result
        0.04 mm
        0.00157 in.        		 mm
        in.
      3. If the runout is more than the maximum, replace the camshaft.
      4. Check the oil clearance after replacing the camshaft.

        HINT: 

        See step  17

    2. Using a micrometer, measure the cam lobe height.
      GTY653368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Cam Lobe Height

      Item Minimum Cam Lobe Height Specified Condition Result
      Intake camshaft (for Bank 1) 44.235 mm
      1.74153 in.      		 44.335 to 44.435 mm
      1.74547 to 1.74941 in.      		 mm
      in.
      Intake camshaft (for Bank 2) 44.237 mm
      1.74161 in.      		 44.337 to 44.437 mm
      1.74555 to 1.74948 in.      		 mm
      in.
      Exhaust camshaft (for Bank 1) 43.766 mm
      1.72307 in.      		 43.866 to 43.966 mm
      1.72700 to 1.73094 in.      		 mm
      in.
      Exhaust camshaft (for Bank 2) 43.767 mm
      1.72311 in.      		 43.867 to 43.967 mm
      1.72704 to 1.73098 in.      		 mm
      in.
      Exhaust camshaft (for Fuel pump) 40.454 mm
      1.59267 in.      		 40.554 to 40.654 mm
      1.59661 to 1.60055 in.      		 mm
      in.
    3. If the cam lobe height is less than the minimum, replace the camshaft.
    4. Using a micrometer, measure the journal diameter.
      GTY653369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Journal Diameter

      Item Specified Condition Result
      No. 1 journal 35.946 to 35.960 mm
      1.41519 to 1.41575 in.      		 mm
      in.
      Other journals 25.959 to 25.975 mm
      1.02201 to 1.02264 in.      		 mm
      in.
    5. If the journal diameter is not as specified, check the oil clearance.

      HINT: 

      See step  17

  4. INSPECT CYLINDER HEAD SET BOLT 
    1. Using a vernier caliper, measure the diameter of the threads at the measurement point.
      GTY671618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Measurement Point
      *b 100 mm

      Standard Diameter

      Measurement Point (Distance from the Seat) Minimum Diameter Specified Condition Result
      100 mm
      3.94 in.      		 10.70 mm
      0.421 in.      		 10.85 to 11.00 mm
      0.427 to 0.433 in.      		 mm
      in.
    2. If the diameter is less than the minimum, replace the cylinder head set bolt. Failure to do so may lead to engine damage.
    3. If there is any thread deformation, replace the cylinder head set bolt with a new one.
  5. INSPECT CHAIN SUB-ASSEMBLY 

    Pre-procedure1

    • Using a spring scale, pull the chain sub-assembly with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.
      GTY739132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Measurement Length
    • Using a vernier caliper, measure the length of 15 links.

      Maximum Chain Elongation

      Specified Condition Result
      137.8 mm
      5.43 in.      		 mm
      in.
      NOTE:

      Perform the measurement at 3 random places. Use the average of the measurements.

    • If the average elongation is more than the maximum, replace the chain sub-assembly.

    Post-procedure1

    • None
  6. INSPECT NO. 2 CHAIN SUB-ASSEMBLY 

    Pre-procedure1

    • Using a spring scale, pull the No. 2 chain sub-assembly with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.
      GTY739132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Measurement Length
    • Using a vernier caliper, measure the length of 15 links.

      Maximum Chain Elongation

      Specified Condition Result
      137.8 mm
      5.43 in.      		 mm
      in.
      NOTE:

      Perform the measurement at 3 random places. Use the average of the measurements.

      1. If the average elongation is more than the maximum, replace the No. 2 chain sub-assembly.

    Post-procedure1

    • None
  7. INSPECT CRANKSHAFT TIMING GEAR OR SPROCKET 

    Pre-procedure1

    • Place the chain sub-assembly around the crankshaft timing gear or sprocket.
    • Using a vernier caliper, measure the diameter of the crankshaft timing gear or sprocket with the chain sub-assembly.
      GTY653300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Maximum Sprocket Diameter (with Chain Sub-assembly)

      Specified Condition Result
      62.2 mm
      2.45 in.      		 mm
      in.
      NOTE:

      The vernier caliper must contact the chain rollers when measuring.

    • If the diameter is more than the maximum, replace the chain sub-assembly and crankshaft timing gear or sprocket.

    Post-procedure1

    • None
  8. INSPECT IDLE SPROCKET ASSEMBLY 

    Pre-procedure1

    • Place the chain sub-assembly around the idle sprocket assembly.
    • Using a vernier caliper, measure the diameter of the idle sprocket assembly with the chain sub-assembly.
      GTY681491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Maximum Sprocket Diameter (with Chain Sub-assembly)

      Specified Condition Result
      65.2 mm
      2.57 in.      		 mm
      in.
      NOTE:

      The vernier caliper must contact the chain rollers when measuring.

    • If the diameter is more than the maximum, replace the chain sub-assembly and idle sprocket assembly.

    Post-procedure1

    • None
  9. INSPECT NO. 1 IDLE GEAR SHAFT OIL CLEARANCE 
    1. Using a micrometer, measure the diameter of the No. 1 idle gear shaft.
      GTY653298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard No. 1 Idle Gear Shaft Diameter

      Specified Condition Result
      22.987 to 23.000 mm
      0.905 to 0.906 in.      		 mm
      in.
    2. Using a caliper gauge, measure the inside diameter of the idle sprocket assembly.
      GTY653299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Idle Sprocket Assembly Inside Diameter

      Specified Condition Result
      23.020 to 23.030 mm
      0.906 to 0.907 in.      		 mm
      in.
    3. Subtract the No. 1 idle gear shaft diameter measurement from the idle sprocket assembly inside diameter measurement.

      Standard Oil Clearance

      Maximum Oil Clearance Specified Condition Result
      0.093 mm
      0.00366 in.      		 0.020 to 0.043 mm
      0.000787 to 0.00169 in.      		 mm
      in.
    4. If the oil clearance is more than the maximum, replace the No. 1 idle gear shaft and idle sprocket assembly.
  10. INSPECT NO. 1 CHAIN TENSIONER ASSEMBLY 
    1. Turn the stopper plate clockwise to release the lock. Push the plunger and check that it moves smoothly.
      GTY636454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Plunger
      *b Stopper Plate
    2. If the plunger does not move smoothly, replace the No. 1 chain tensioner assembly.
  11. INSPECT NO. 2 CHAIN TENSIONER ASSEMBLY 
    1. Check that the plunger moves smoothly.
      GTY676442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Depth
    2. Using a vernier caliper, measure the wear depth of the No. 2 chain tensioner assembly.

      Maximum Depth

      Specified Condition Result
      1.0 mm
      0.0394 in.      		 mm
      in.
    3. If the depth is more than the maximum, replace the No. 2 chain tensioner assembly.
  12. INSPECT NO. 3 CHAIN TENSIONER ASSEMBLY 
    1. Check that the plunger moves smoothly.
      GTY653819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Depth
    2. Using a vernier caliper, measure the wear depth of the No. 3 chain tensioner assembly.

      Maximum Depth

      Specified Condition Result
      1.0 mm
      0.0394 in.      		 mm
      in.
    3. If the depth is more than the maximum, replace the No. 3 chain tensioner assembly.
  13. INSPECT CHAIN TENSIONER SLIPPER 
    1. Measure the wear depth of the chain tensioner slipper.
      GTY646990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Depth

      Maximum Depth

      Specified Condition Result
      1.0 mm
      0.0394 in.      		 mm
      in.
    2. If the depth is more than the maximum, replace the chain tensioner slipper.
  14. INSPECT NO. 1 CHAIN VIBRATION DAMPER 
    1. Using a vernier caliper, measure the wear depth of the No. 1 chain vibration damper.
      GTY616769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Depth

      Maximum Depth

      Specified Condition Result
      1.0 mm
      0.0394 in.      		 mm
      in.
    2. If the depth is more than the maximum, replace the No. 1 chain vibration damper.
  15. INSPECT NO. 2 CHAIN VIBRATION DAMPER 
    1. Using a vernier caliper, measure the wear depth of the No. 2 chain vibration damper.
      GTY639546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Depth

      Maximum Depth

      Specified Condition Result
      1.0 mm
      0.0394 in.      		 mm
      in.
    2. If the depth is more than the maximum, replace the No. 2 chain vibration damper.
  16. INSPECT CAMSHAFT THRUST CLEARANCE 
    1. Inspect the camshaft thrust clearance (for Bank 1).
      1. Install the camshaft.

        HINT: 

        See step  25

      2. Install the No. 2 camshaft.

        HINT: 

        See step  26

      3. Using a dial indicator, measure the thrust clearance while moving each camshaft back and forth.
        GTY651187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Thrust Clearance

        Maximum thrust clearance Specified Condition Result
        0.18 mm
        0.00709 in.        		 0.08 to 0.130 mm
        0.00315 to 0.00512 in.        		 mm
        in.
      4. If the thrust clearance is more than the maximum, replace the camshaft housing sub-assembly RH. If the thrust surface is damaged, replace the camshaft or No. 2 camshaft.
    2. Inspect the camshaft thrust clearance (for Bank 2).
      1. Install the No. 3 camshaft sub-assembly.

        HINT: 

        See step  15

      2. Install the No. 4 camshaft sub-assembly.

        HINT: 

        See step  16

      3. Using a dial indicator, measure the thrust clearance while moving each camshaft back and forth.

        Standard Thrust Clearance

        Maximum thrust clearance Specified Condition Result
        0.18 mm
        0.00709 in.        		 0.08 to 0.130 mm
        0.00315 to 0.00512 in.        		 mm
        in.
      4. If the thrust clearance is more than the maximum, replace the camshaft housing sub-assembly LH. If the thrust surface is damaged, replace the No. 3 camshaft sub-assembly or No. 4 camshaft sub-assembly.
  17. INSPECT CAMSHAFT OIL CLEARANCE 
    1. for Bank 1:
      1. Clean the camshaft bearing caps, camshaft housing sub-assembly RH and camshaft journals.
      2. Place the camshafts onto the camshaft housing sub-assembly RH.
      3. Lay a strip of Plastigage across each camshaft journal.
        GTY634170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Plastigage
      4. Install the camshaft bearing caps.
        NOTE:

        Do not turn the camshafts.

        HINT: 

        See step  27

      5. Remove the camshaft bearing caps.

        HINT: 

        Refer to PROCEDURE - Step 69

      6. Measure the Plastigage at its widest point.
        GTY679818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Plastigage
        *b No. 1 Journal
        *c Other Journals

        Standard Oil Clearance

        Item Maximum Oil Clearance Specified Condition Result
        No. 1 Journal 0.1 mm
        0.00394 in.        		 0.032 to 0.063 mm
        0.00126 to 0.00248 in.        		 mm
        in.
        Other Journals 0.1 mm
        0.00394 in.        		 0.025 to 0.062 mm
        0.000984 to 0.00244 in.        		 mm
        in.
      7. If the oil clearance is more than the maximum, replace the camshaft or No. 2 camshaft. If necessary, replace the camshaft housing sub-assembly RH.
    2. for Bank 2:
      1. Clean the camshaft bearing caps, camshaft housing sub-assembly LH and camshaft journals.
      2. Place the camshafts on the camshaft housing sub-assembly LH.
      3. Lay a strip of Plastigage across each camshaft journal.
        GTY652289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Plastigage
      4. Install the camshaft bearing caps.
        NOTE:

        Do not turn the camshafts.

        HINT: 

        See step  17

      5. Remove the camshaft bearing caps.

        HINT: 

        Refer to PROCEDURE - Step 75

      6. Measure the Plastigage at its widest point.
        GTY622191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Plastigage
        *b No. 1 Journal
        *c Other Journals

        Standard Oil Clearance

        Item Maximum Oil Clearance Specified Condition Result
        No. 1 Journal 0.1 mm
        0.00394 in.        		 0.032 to 0.063 mm
        0.00126 to 0.00248 in.        		 mm
        in.
        Other Journals 0.1 mm
        0.00394 in.        		 0.025 to 0.062 mm
        0.000984 to 0.00244 in.        		 mm
        in.
      7. If the oil clearance is more than the maximum, replace the No. 3 camshaft sub-assembly or No. 4 camshaft sub-assembly. If necessary, replace the camshaft housing sub-assembly LH.
  18. INSPECT INTAKE MANIFOLD 
    1. GTY676124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Cylinder Head Sub-assembly and Cylinder Head LH Side
      *b Intake Air Surge Tank Assembly Side

      Cylinder Head Side:

      1. Using a precision straightedge and feeler gauge, check the surface which contacts the cylinder head sub-assembly and cylinder head LH for warpage.

        Maximum Warpage

        Specified Condition Result
        0.1 mm
        0.00394 in.        		 mm
        in.
      2. If the warpage is more than the maximum, replace the intake manifold.
    2. Surge Tank Side:
      1. Using a precision straightedge and feeler gauge, check the surface which contacts the intake air surge tank assembly for warpage.

        Maximum Warpage

        Specified Condition Result
        0.1 mm
        0.00394 in.        		 mm
        in.
      2. If the warpage is more than the maximum, replace the intake manifold.
  19. INSPECT EXHAUST MANIFOLD 
    1. Using a precision straightedge and feeler gauge, check the surface which contacts the cylinder head sub-assembly and cylinder head LH for warpage.

      Maximum Warpage

      Specified Condition Result
      0.7 mm
      0.0276 in.      		 mm
      in.
      GTY653308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. If the warpage is more than the maximum, replace the exhaust manifold assembly LH or exhaust manifold assembly RH.
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