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


  • A01X2ILN02

    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.)
  • A01XBCZC02
    *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. A01X096E08

      Valve Spring Type A:


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

        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. A01X6P2E01

      Valve Spring Type B:


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

        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. A01X0E6E02

      Valve Spring Type A:


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

        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. A01X5PRE01

      Valve Spring Type B:


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

        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. A01XATK

      Using needle-nose pliers, remove the oil seals.

  4. REMOVE VALVE SPRING SEAT


    1. A01X4NY

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

  5. REMOVE NO. 1 STRAIGHT SCREW PLUG

    A01X82CE05
    Text in Illustration
    *A LH
    *B RH

    Note

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


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

  6. REMOVE NO. 2 STRAIGHT SCREW PLUG

    A01X0WWE05
    Text in Illustration
    *A LH
    *B RH

    Note

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


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

  7. REMOVE STUD BOLT

    Note

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