CYLINDER HEAD REPLACEMENT

PROCEDURE


  1. REPLACE INTAKE VALVE GUIDE BUSH


    1. Heat the cylinder head sub-assembly to 80 to 100°C (176 to 212°F).

    2. Place the cylinder head sub-assembly on wooden blocks.

    3. A01D5EON04

      Using SST and a hammer, tap out the intake valve guide bush.

      SST
      09201-10000   ( 09201-01050 )
      09950-70010   ( 09951-07100 )
    4. A01D3TS

      Using a caliper gauge, measure the intake valve guide bush bore diameter of the cylinder head sub-assembly.

      Standard bush bore diameter
      10.285 to 10.306 mm (0.40492 to 0.40575 in.)
      New Guide Bush Selection Chart (STD or O/S 0.05)
      Bush Size Bush Bore Diameter
      STD 10.285 to 10.306 mm (0.40492 to 0.40575 in.)
      O/S 0.05 10.335 to 10.356 mm (0.40689 to 0.40772 in.)

      If the intake valve guide bush bore diameter of the cylinder head sub-assembly is greater than 10.306 mm (0.40575 in.), machine the bush bore to the diameter of 10.335 to 10.356 mm (0.40689 to 0.40772 in.) to install an O/S 0.05 valve guide bush. If the intake valve guide bush bore diameter of the cylinder head sub-assembly is greater than 10.356 mm (0.40772 in.), replace the cylinder head sub-assembly.

    5. Heat the cylinder head sub-assembly to 80 to 100°C (176 to 212°F).

    6. Place the cylinder head sub-assembly on wooden blocks.

    7. A01D5EDN02

      Using SST and a hammer, tap a new intake valve guide bush into the specified protrusion height.

      SST
      09201-10000   ( 09201-01050 )
      09950-70010   ( 09951-07100 )
      Standard protrusion height
      9.6 to 10.0 mm (0.378 to 0.394 in.)
    8. A01D579

      Using a sharp 5.5 mm reamer, ream the intake valve guide bush to obtain the standard oil clearance between the intake valve guide bush and intake valve stem.

      Standard oil clearance
      0.025 to 0.060 mm (0.000984 to 0.00236 in.)

  2. REPLACE EXHAUST VALVE GUIDE BUSH


    1. Heat the cylinder head sub-assembly to 80 to 100°C (176 to 212°F).

    2. Place the cylinder head sub-assembly on wooden blocks.

    3. A01D4AGN03

      Using SST and a hammer, tap out the exhaust valve guide bush.

      SST
      09201-10000   ( 09201-01050 )
      09950-70010   ( 09951-07100 )
    4. A01D4BQ

      Using a caliper gauge, measure the exhaust valve guide bush bore diameter of the cylinder head sub-assembly.

      Standard bush bore diameter
      10.285 to 10.306 mm (0.40492 to 0.40575 in.)
      New Guide Bush Selection Chart (STD or O/S 0.05)
      Bush Size Bush Bore Diameter
      STD 10.285 to 10.306 mm (0.40492 to 0.40575 in.)
      O/S 0.05 10.335 to 10.356 mm (0.40689 to 0.40772 in.)

      If the exhaust valve guide bush bore diameter of the cylinder head sub-assembly is greater than 10.306 mm (0.40575 in.), machine the bush bore to the diameter of 10.335 to 10.356 mm (0.40689 to 0.40772 in.) to install an O/S 0.05 valve guide bush. If the exhaust valve guide bush bore diameter of the cylinder head sub-assembly is greater than 10.356 mm (0.40772 in.), replace the cylinder head sub-assembly.

    5. Heat the cylinder head sub-assembly to 80 to 100°C (176 to 212°F).

    6. Place the cylinder head sub-assembly on wooden blocks.

    7. A01D578N02

      Using SST and a hammer, tap a new exhaust valve guide bush into the specified protrusion height.

      SST
      09201-10000   ( 09201-01050 )
      09950-70010   ( 09951-07100 )
      Standard protrusion height
      9.6 to 10.0 mm (0.378 to 0.394 in.)
    8. A01D61D

      Using a sharp 5.5 mm reamer, ream the exhaust valve guide bush to obtain the standard oil clearance between the exhaust valve guide bush and exhaust valve stem.

      Standard oil clearance
      0.030 to 0.065 mm (0.00118 to 0.00256 in.)

  3. REPLACE RING PIN

    Note

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


    1. Remove the 4 ring pins.

    2. Using a plastic-faced hammer, tap in 4 new ring pins to the specified protrusion height.

      A01D432C02
      *a Upper Side - -
      Protrusion Height
      Item Protrusion Height
      Ring pin A 6.0 to 8.0 mm (0.236 to 0.315 in.)
      Ring pin B 4.0 to 6.0 mm (0.157 to 0.236 in.)

  4. REPLACE STUD BOLT

    Note

    If any of the stud bolts is deformed or the threads are damaged, replace it.

    Tech Tips


    • There are 2 installation types for the No. 1 chain tensioner assembly.

    • Depending on the installation type, the number of stud bolts used will vary.


    1. for No. 1 chain tensioner assembly installed with nut:


      1. Remove the 13 stud bolts.

      2. Using E5 and E8 "TORX" socket wrenches, install the 13 stud bolts.

        A01D58FC01
        *a Intake Side *b Exhaust Side
        *c Front Side - -
        Torque:
        Stud bolt (A) and (B)
        7.5 N*m  { 76 kgf*cm, 66 in.*lbf }
        Stud bolt (C)
        5.0 N*m  { 51 kgf*cm, 44 in.*lbf }

    2. for No. 1 chain tensioner assembly installed with bolt:


      1. Remove the 11 stud bolts.

      2. Using an E8 "TORX" socket wrench, install the 11 stud bolts.

        A01D4IGC01
        *a Intake Side *b Exhaust Side
        Torque:
        7.5 N*m  { 76 kgf*cm, 66 in.*lbf }