CYLINDER HEAD DISASSEMBLY

CAUTION / NOTICE / HINT

Note

There are two cylinder head assembly shapes. Valve spring type A can only be used with cylinder head type A and valve spring type B can only be used with cylinder head type B. The combination cannot be changed.

Tech Tips


  • A00190XN02

    The standard protrusion amount (A) of the valve guide bush determines whether the cylinder head is type A or B.

    Standard Protrusion Height (A)
    Type Specified Condition
    Cylinder Head Type A 14.3 to 14.7 mm (0.563 to 0.579 in.)
    Cylinder Head Type B 15.8 to 16.2 mm (0.622 to 0.638 in.)
  • A001F93C02
    *A Valve Spring Type A
    *B Valve Spring Type B
    *1 No. 1 Valve Rocker Arm Sub-assembly
    *2 Valve Spring Retainer
    *3 Inner Compression Spring
    *a Valve Spring Retainer Outer Diameter
    *b No. 1 Valve Rocker Arm Roller Width

    The shape of the inner compression spring determines whether the valve spring type is A or B.

  • The No. 1 valve rocker arm, inner compression spring and valve spring retainer have two different shapes and are not interchangeable.

    Valve Spring Type No. 1 Valve Rocker Arm Roller Width Valve Spring Retainer Outer Diameter Inner Compression Spring Shape
    A 10.7 mm (0.421 in.) 23.4 mm (0.921 in.) Straight
    B 8.0 mm (0.315 in.) 18.9 mm (0.744 in.) Taper

PROCEDURE


  1. REMOVE INTAKE VALVE

    Tech Tips

    The shape of the inner compression spring determines whether the valve spring type is A or B.


    1. A001C2IE01

      Valve Spring Type A:


      1. Using SST and wooden blocks, compress the compression spring and remove the valve retainer lock.

        SST
        09202-70020   ( 09202-00010, 09202-01010, 09202-01020 )

      2. Remove the retainer, compression spring and valve.

        Tech Tips

        Arrange the removed parts in the correct order.

    2. A001F5BE01

      Valve Spring Type B:


      1. Using SST and wooden blocks, compress the compression spring and remove the valve retainer lock.

        SST
        09202-70020   ( 09202-01010, 09202-01020 )
        09202-00021

      2. Remove the retainer, compression spring and valve.

        Tech Tips

        Arrange the removed parts in the correct order.

  2. REMOVE EXHAUST VALVE

    Tech Tips

    The shape of the inner compression spring determines whether the valve spring type is A or B.


    1. A001D8ZE01

      Valve Spring Type A:


      1. Using SST and wooden blocks, compress the compression spring and remove the valve retainer lock.

        SST
        09202-70020   ( 09202-00010, 09202-01010, 09202-01020 )

      2. Remove the retainer, compression spring and valve.

        Tech Tips

        Arrange the removed parts in the correct order.

    2. A001AYTE01

      Valve Spring Type B:


      1. Using SST and wooden blocks, compress the compression spring and remove the valve retainer lock.

        SST
        09202-70020   ( 09202-01010, 09202-01020 )
        09202-00021

      2. Remove the retainer, compression spring and valve.

        Tech Tips

        Arrange the removed parts in the correct order.

  3. REMOVE VALVE STEM OIL SEAL


    1. A0019S0

      Using needle-nose pliers, remove the oil seals.

  4. REMOVE VALVE SPRING SEAT


    1. A001DT5

      Using compressed air and a magnet hand, remove the valve spring seat by blowing air onto it.

  5. REMOVE NO. 1 STRAIGHT SCREW PLUG

    Note

    If water leaks from the No. 1 screw plug or the plug is corroded, replace it.


    1. A0019SLE06
      *1 for Bank 2:
      *2 for Bank 1:

      Using a 10 mm hexagon wrench, remove the 6 screw plugs and 6 gaskets.

  6. REMOVE NO. 2 STRAIGHT SCREW PLUG


    1. A001FTZE02
      *1 for Bank 2:
      *2 for Bank 1:

      Using a 14 mm hexagon wrench, remove the 2 screw plugs and 2 gaskets.

      Note

      If water leaks from the No. 2 screw plug or the plug is corroded, replace it.

  7. REMOVE STUD BOLT

    Note

    If a stud bolt is deformed or its threads are damaged, replace it.