ENGINE UNIT INSPECTION

PROCEDURE


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


    1. Turn the roller by hand and 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 adjuster free from dirt and foreign matter.

    • Use only clean engine oil.


    1. Place the valve lash adjuster assembly into a container full of new engine oil.

      A01MXPDC21
      *a Taper Part *b Plunger
      *c Low Pressure Chamber *d Check Ball
      *e High Pressure Chamber - -

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

      SST
      09276-75010

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

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

      OK
      Plunger moves up and down.

      Note

      When bleeding high-pressure air from the compression 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 will not bleed.

    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 CAMSHAFT


    1. Inspect the camshaft runout.


      1. Place the camshaft on V-blocks.

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

        Maximum circle runout
        0.03 mm (0.00118 in.)

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

        Tech Tips

        Check the oil clearance after replacing the camshaft.

    2. Inspect the cam lobes.


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

        Standard cam lobe height
        44.155 to 44.255 mm (1.738 to 1.742 in.)
        Minimum cam lobe height
        44.045 mm (1.734 in.)

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

    3. Inspect the camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard Journal Diameter
        Item Specified Condition
        No. 1 journal 34.449 to 34.465 mm (1.356 to 1.357 in.)
        Other journals 22.959 to 22.975 mm (0.904 to 0.905 in.)

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

  4. INSPECT NO. 2 CAMSHAFT


    1. Inspect the No. 2 camshaft 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
        0.03 mm (0.00118 in.)

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

        Tech Tips

        Check the oil clearance after replacing the No. 2 camshaft.

    2. Inspect the cam lobes.


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

        Standard cam lobe height
        43.499 to 43.599 mm (1.713 to 1.716 in.)
        Minimum cam lobe height
        43.389 mm (1.708 in.)

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

    3. Inspect the No. 2 camshaft journals.


      1. Using a micrometer, measure the journal diameter.

        Standard Journal Diameter
        Item Specified Condition
        No. 1 journal 34.449 to 34.465 mm (1.356 to 1.357 in.)
        Other journals 22.959 to 22.975 mm (0.904 to 0.905 in.)

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

  5. INSPECT CAMSHAFT OIL CLEARANCE

    Note

    Do not turn the camshafts.


    1. Clean the camshaft bearing caps, camshaft housing sub-assembly and camshaft journals.

    2. Place the camshafts on the camshaft housing sub-assembly.

    3. A01MX64C01
      *a Plastigage

      Lay a strip of Plastigage across each of the camshaft journals.

    4. Place the No. 1, No. 2, No. 3 and No. 4 camshaft bearing caps to the camshaft housing sub-assembly.

    5. A01MUOSN03

      Install the 11 bearing cap bolts in the order shown in the illustration.

      Torque:
      16 N*m  { 163 kgf*cm, 12 ft.*lbf }

      Note

      Do not turn the camshafts.

    6. A001JACN03

      Install the camshaft housing sub-assembly, and then install the 22 bearing cap bolts in the order shown in the illustration.

      Torque:
      27 N*m  { 275 kgf*cm, 20 ft.*lbf }

    7. Remove the No. 1, No. 2, No. 3 and No. 4 camshaft bearing caps.

      Click here

    8. A01MX2SC01
      *a Plastigage
      *b No. 1 Journal
      *c Other Journals

      Measure the Plastigage at its widest point.

      Standard Oil Clearance
      Item Specified Condition
      Intake No. 1 journal 0.035 to 0.072 mm (0.00138 to 0.00284 in.)
      Exhaust No. 1 journal 0.005 to 0.054 mm (0.000197 to 0.00213 in.)
      Other journals 0.025 to 0.062 mm (0.000984 to 0.00244 in.)
      Maximum Oil Clearance
      Item Specified Condition
      Intake No. 1 journal 0.085 mm (0.00335 in.)
      Exhaust No. 1 journal 0.085 mm (0.00335 in.)
      Other journals 0.085 mm (0.00335 in.)

      If the oil clearance is more than the maximum, replace the camshaft. If necessary, replace the camshaft housing sub-assembly.

  6. INSPECT CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY


    1. Install the camshaft timing exhaust gear assembly to the No. 2 camshaft.

      Click here

    2. Release the lock pin.


      1. Clean the No. 2 camshaft journal with non-residue solvent.

      2. A01MYO1C02
        *a Knock Pin
        *b Advance Side Path
        *c Retard Side Path
        *d Open
        *e Close
        B003UDQ Rubber Piece
        A001IE1 Vinyl Tape

        Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.

        Tech Tips

        There are 4 oil paths in the grooves of the No. 2 camshaft. Plug 2 paths with rubber pieces.

      3. Make a hole in the vinyl tape placed over the 2 oil holes that are not plugged with rubber pieces.

      4. A01MXEDC02
        *a Advance Side Path
        *b Retard Side Path

        Apply approximately 200 kPa (2.0 kgf/cm2, 29 psi) of air pressure to the 2 open paths (the advance side path and retard side path).

        Note

        Cover the paths with a piece of cloth when applying pressure to keep oil from spraying.

      5. A01MULPC02
        *a Advance Side Path
        *b Retard Side Path
        *c Hold Pressure
        *d Decompress

        Check that the camshaft timing exhaust gear assembly turns in the retard direction when reducing the air pressure applied to the advance side path.

        Tech Tips

        The lock pin is released and the camshaft timing exhaust gear assembly turns in the retard direction.

      6. When the camshaft timing exhaust gear assembly moves to the most retarded position, release the air pressure from the advance side path, and then release the air pressure from the retard side path.

        Note

        Be sure to release the air pressure from the advance side path first. If the air pressure of the retard side path is released first, the camshaft timing exhaust gear assembly may abruptly shift in the advance direction and break the lock pin or other parts.

    3. Check for smooth rotation.


      1. Turn the camshaft timing exhaust gear assembly within its movable range (21.5 to 23.5°) 2 or 3 times, but do not turn it to the most advanced position. Make sure that the gear turns smoothly.

        Note

        When the air pressure is released from the advance side path and then from the retard side path, the gear automatically returns to the most advanced position due to the advance assist spring operation, and locks.

        Gradually release the air pressure from the retard side path before performing the smooth rotation check.

    4. Remove the vinyl tape and rubber pieces from the No. 2 camshaft.

    5. Remove the camshaft timing exhaust gear assembly from the No. 2 camshaft.

      Click here

    6. Place the chain sub-assembly around the camshaft timing exhaust gear assembly.

    7. Inspect the camshaft timing exhaust gear assembly diameter.


      1. A01MVJSC12
        *a Chain Sub-assembly Roller

        Using a vernier caliper, measure the camshaft timing exhaust gear assembly diameter with the chain sub-assembly.

        Minimum diameter (with chain sub-assembly)
        115.12 mm (4.53 in.)

        Tech Tips

        The vernier caliper must contact the chain rollers for the measurement.

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

  7. INSPECT CHAIN SUB-ASSEMBLY


    1. A01MVXCC54
      *a Measuring Point

      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.

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

      Maximum chain elongation
      137.1 mm (5.40 in.)

      Tech Tips

      Perform the measurement at 3 random places.

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

  8. INSPECT CRANKSHAFT TIMING GEAR OR SPROCKET


    1. Wrap the chain sub-assembly around the crankshaft timing gear or sprocket.

    2. A01MUL5

      Using a vernier caliper, measure the crankshaft timing gear or sprocket diameter together with the chain sub-assembly.

      Minimum sprocket diameter (with chain sub-assembly)
      59.94 mm (2.36 in.)

      Tech Tips

      The vernier caliper must contact the chain rollers for the measurement.

      If the diameter is less than the minimum, replace the chain sub-assembly and crankshaft timing gear or sprocket.

  9. INSPECT NO. 1 CHAIN TENSIONER ASSEMBLY


    1. A01MV09C02
      *a Stopper Plate
      *b Plunger

      Move the stopper plate counterclockwise to release the lock. Push the plunger and check that it moves smoothly.

      If necessary, replace the No. 1 chain tensioner assembly.

  10. INSPECT CHAIN TENSIONER SLIPPER


    1. A01MYTTC02
      *a Depth

      Measure the depth of wear of the chain tensioner slipper.

      Maximum depth
      1.0 mm (0.0394 in.)

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

  11. INSPECT NO. 1 CHAIN VIBRATION DAMPER


    1. A01MYXRC02
      *a Depth

      Measure the depth of wear of the No. 1 chain vibration damper.

      Maximum depth
      1.0 mm (0.0394 in.)

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

  12. INSPECT TIMING CHAIN GUIDE


    1. A01MX1EC17
      *a Depth

      Measure the depth of wear of the timing chain guide.

      Maximum depth
      1.0 mm (0.0394 in.)

      If the depth is more than the maximum, replace the timing chain guide.

  13. INSPECT BALANCE SHAFT THRUST CLEARANCE


    1. Inspect the No. 1 balance shaft thrust clearance.


      1. A01MYSV

        Using a dial indicator, measure the thrust clearance while moving the No. 1 balance shaft back and forth.

        Standard thrust clearance
        0.07 to 0.11 mm (0.00276 to 0.00433 in.)
        Maximum thrust clearance
        0.11 mm (0.00433 in.)

        If the thrust clearance is more than the maximum, replace the engine balancer assembly.

    2. Inspect the No. 2 balance shaft thrust clearance.


      1. A01MUVD

        Using a dial indicator, measure the thrust clearance while moving the No. 2 balance shaft back and forth.

        Standard thrust clearance
        0.07 to 0.11 mm (0.00276 to 0.00433 in.)
        Maximum thrust clearance
        0.11 mm (0.00433 in.)

        If the thrust clearance is more than the maximum, replace the engine balancer assembly.

  14. INSPECT BALANCE SHAFT BACKLASH


    1. A01MZB7C01
      *a Fix

      Fix the No. 2 balance shaft in place, and then, using a dial indicator, measure the backlash of the No. 1 and No. 2 balance shafts as shown in the illustration.

      Standard backlash
      0.04 to 0.16 mm (0.00157 to 0.00630 in.)
      Maximum backlash
      0.16 mm (0.00630 in.)

      Note

      Measure at 3 or more areas around the circumference of the No. 1 and No. 2 balance shafts.

      If the backlash is more than the maximum, replace the engine balancer assembly.

  15. INSPECT CYLINDER HEAD SET BOLT


    1. A01MYZFC02
      *a Measuring Point
      B003WAF Depth

      Using a vernier caliper, measure the diameter of the elongated thread at the measuring point.

      Measuring point
      106 mm (4.17 in.)
      Standard diameter
      10.85 to 11.00 mm (0.427 to 0.433 in.)
      Minimum diameter
      10.6 mm (0.417 in.)

      Tech Tips

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

      If the diameter is less than the minimum, replace the cylinder head set bolt.