ENGINE UNIT INSPECTION

PROCEDURE


  1. INSPECT NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY


    1. A005AY6

      Turn the roller by hand to check that it turns smoothly.

      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 free from dirt and foreign matter.

    • Only use clean engine oil.


    1. Place the lash adjuster into a container filled with new engine oil.

    2. Insert the tip of SST into the lash adjuster plunger and use the tip to press down on the check ball inside the plunger.

      A005AO8E01
      Text in Illustration
      *1 Plunger
      *2 Check Ball
      *3 Low Pressure Chamber
      *4 High Pressure Chamber
      *a CORRECT
      *b INCORRECT
      *c Taper Part
      SST
      09276-75010

    3. Squeeze SST and the valve lash adjuster together to move the plunger up and down 5 to 6 times.

    4. Check the movement of the plunger and bleed the air.

      OK
      Plunger moves up and down.

      Note

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

    5. After bleeding the air, remove SST. Then try to quickly and firmly press the plunger with your fingers.

      OK
      Plunger is very difficult to move.

      If the result is not as specified, replace the valve lash adjuster assembly.

  3. INSPECT CHAIN SUB-ASSEMBLY


    1. A005CDDE19
      Text in Illustration
      *a Measurement Length

      Pull the chain with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.

    2. Using a vernier caliper, measure the length of 15 links.

      Maximum chain elongation
      115.2 mm (4.54 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.

  4. INSPECT NO. 2 CHAIN SUB-ASSEMBLY


    1. A005CDDE19
      Text in Illustration
      *a Measurement Length

      Pull the chain with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.

    2. Using a vernier caliper, measure the length of 15 links.

      Maximum chain elongation
      102.1 mm (4.02 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 No. 2 chain sub-assembly.

  5. INSPECT OIL PUMP DRIVE GEAR


    1. A005CTY

      Place the chain around the oil pump drive gear.

    2. Using a vernier caliper, measure the diameter of the oil pump drive gear and chain.

      Minimum gear diameter (with chain)
      48.2 mm (1.90 in.)

      Note

      The vernier caliper must be in contact with the chain rollers when measuring.

      If the diameter is less than the minimum, replace the chain and oil pump drive gear.

  6. INSPECT OIL PUMP DRIVE SHAFT GEAR


    1. A005AQ1

      Place the chain around the oil pump drive shaft gear.

    2. Using a vernier caliper, measure the diameter of the oil pump drive shaft gear and chain.

      Minimum gear diameter (with chain)
      48.2 mm (1.90 in.)

      Note

      The vernier caliper must be in contact with the chain rollers when measuring.

      If the diameter is less than the minimum, replace the chain and oil pump drive shaft gear.

  7. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY


    1. A005ELT

      Place the chain around the camshaft timing gear assembly.

    2. Using a vernier caliper, measure the diameter of the camshaft timing gear assembly and chain.

      Minimum gear diameter (with chain)
      96.8 mm (3.81 in.)

      Note

      The vernier caliper must be in contact with the chain rollers when measuring.

      If the diameter is less than the minimum, replace the chain and camshaft timing gear assembly.

  8. INSPECT CAMSHAFT TIMING SPROCKET


    1. A005CYT

      Place the chain around the camshaft timing sprocket.

    2. Using a vernier caliper, measure the diameter of the camshaft timing sprocket and chain.

      Minimum gear diameter (with chain)
      96.8 mm (3.81 in.)

      Note

      The vernier caliper must be in contact with the chain rollers when measuring.

      If the diameter is less than the minimum, replace the chain and camshaft timing sprocket.

  9. INSPECT CRANKSHAFT TIMING GEAR


    1. A005CTY

      Place the chain around the crankshaft timing gear.

    2. Using a vernier caliper, measure the diameter of the crankshaft timing gear and chain.

      Minimum gear diameter (with chain)
      51.1 mm (2.01 in.)

      Note

      The vernier caliper must be in contact with the chain rollers when measuring.

      If the diameter is less than the minimum, replace the chain and crankshaft timing gear.

  10. INSPECT CHAIN TENSIONER SLIPPER


    1. A005EP8

      Using a vernier caliper, measure the chain tensioner slipper wear.

      Maximum wear
      1.0 mm (0.0394 in.)

      If the wear is more than the maximum, replace the chain tensioner slipper.

  11. INSPECT NO. 1 CHAIN VIBRATION DAMPER


    1. A005CV0

      Using a vernier caliper, measure the No. 1 chain vibration damper wear.

      Maximum wear
      1.0 mm (0.0394 in.)

      If the wear is more than the maximum, replace the No. 1 chain vibration damper.

  12. INSPECT NO. 2 CHAIN VIBRATION DAMPER


    1. A005API

      Using a vernier caliper, measure the No. 2 chain vibration damper wear.

      Maximum wear
      1.0 mm (0.0394 in.)

      If the wear is more than the maximum, replace the No. 2 chain vibration damper.

  13. INSPECT CHAIN TENSIONER PLATE


    1. A005CN4

      Using a vernier caliper, measure the chain tensioner plate wear.

      Maximum wear
      1.0 mm (0.0394 in.)

      If the wear is more than the maximum, replace the chain tensioner plate.

  14. INSPECT NO. 1 CHAIN TENSIONER


    1. A005E5WE03
      Text in Illustration
      *a Lock
      *b Move
      *c Raise

      Check that the plunger moves smoothly when the cam is raised with your finger.

    2. Release the cam, then check that the plunger is locked in place by the cam and does not move when pushing with your finger.

      If necessary, replace the No. 1 chain tensioner.

  15. INSPECT CAMSHAFT


    1. A005DJQ

      Inspect the camshaft for runout.


      1. Place the camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.04 mm (0.00157 in.)

        If the circle runout is more than the maximum, replace the camshaft.

    2. A005CN5

      Inspect the cam lobes.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        41.779 to 41.879 mm (1.6448 to 1.6488 in.)
        Minimum cam lobe height
        41.629 mm (1.6389 in.)

        If the cam lobe height is less than the minimum, replace the camshaft.

    3. A005AF4

      Inspect the camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard Journal Diameter
        Journal Position Specified Condition
        No. 1 34.449 to 34.465 mm (1.3563 to 1.3569 in.)
        Others 22.949 to 22.965 mm (0.90350 to 0.90413 in.)

        If the journal diameter is not as specified, check the oil clearance Click here.

  16. INSPECT NO. 2 CAMSHAFT


    1. A005DJQ

      Inspect the No. 2 camshaft for runout.


      1. Place the No. 2 camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.04 mm (0.00157 in.)

        If the circle runout is more than the maximum, replace the No. 2 camshaft.

    2. A005CN5

      Inspect the cam lobes.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        43.346 to 43.446 mm (1.7065 to 1.7105 in.)
        Minimum cam lobe height
        43.196 mm (1.7006 in.)

        If the cam lobe height is less than the minimum, replace the No. 2 camshaft.

    3. A005AF4

      Inspect the camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard Journal Diameter
        Journal Position Specified Condition
        No. 1 34.449 to 34.465 mm (1.3563 to 1.3569 in.)
        Others 22.949 to 22.965 mm (0.90350 to 0.90413 in.)

        If the journal diameter is not as specified, check the oil clearance Click here.

  17. INSPECT CYLINDER HEAD SET BOLT


    1. A005ELWE04
      Text in Illustration
      *a Measurement Length
      *b Measurement Area
      *c Distance

      Using a vernier caliper, measure the length of the cylinder head set bolt from the seat to the end.

      Standard length
      146.8 to 148.2 mm (5.78 to 5.83 in.)
      Maximum length
      149.2 mm (5.87 in.)

      Tech Tips


      • If the length is greater than the maximum, replace the bolt with a new one. Failure to do so may lead to engine damage.

      • If there is any thread deformation, replace the bolt with a new one.

    2. Using a vernier caliper, measure the diameter of the threaded portion of the bolt at its thinnest point.

      Tech Tips

      Use a straightedge to determine the thinnest point of the threaded portion of the bolt.

      Measurement point
      115 mm (4.53 in.)
      Standard diameter
      9.77 to 9.96 mm (0.385 to 0.392 in.)
      Minimum diameter
      9.4 mm (0.370 in.)

      Tech Tips


      • If the diameter is less than the minimum, replace the cylinder head set bolt with a new one. Failure to do so may lead to engine damage.

      • If there is any thread deformation, replace the cylinder head set bolt with a new one.

      Tech Tips

      If a visual check reveals no excessively thin areas, check the center of the bolt (refer to illustration) and find the area that has the smallest diameter.

  18. INSPECT EXHAUST MANIFOLD


    1. A005BI1

      Using a precision straightedge and feeler gauge, measure the warpage on the surface that contacts the cylinder head.

      Maximum warpage
      0.7 mm (0.0276 in.)

      If the warpage is more than the maximum, replace the exhaust manifold.