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. A01X096E03

      Valve Spring Type A:


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

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

      2. Remove the valve spring retainer, compression spring and intake valve.

        Tech Tips

        Arrange the removed parts in the correct order.

    2. A01X6P2E01

      Valve Spring Type B:


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

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

      2. Remove the valve spring retainer, compression spring and intake 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. A01X0E6E03

      Valve Spring Type A:


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

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

      2. Remove the valve spring retainer, compression spring and exhaust valve.

        Tech Tips

        Arrange the removed parts in the correct order.

    2. A01X5PRE01

      Valve Spring Type B:


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

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

      2. Remove the valve spring retainer, compression spring and exhaust 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 valve stem oil seals.

  4. REMOVE VALVE SPRING SEAT


    1. A01X4NY

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

  5. REMOVE NO. 1 STRAIGHT SCREW PLUG

    A01X7AYE04
    Text in Illustration
    *A for Bank 2
    *B for Bank 1

    Note

    If coolant leaks from a No. 1 straight screw plug or a plug is corroded, replace it.


    1. Using a 10 mm hexagon wrench, remove the 6 No. 1 straight screw plugs and 6 gaskets.

  6. REMOVE NO. 2 STRAIGHT SCREW PLUG

    A01X3CTE03
    Text in Illustration
    *A for Bank 2
    *B for Bank 1

    Note

    If coolant leaks from a No. 2 straight screw plug or a plug is corroded, replace it.


    1. Using a 14 mm hexagon wrench, remove the 2 No. 2 straight screw plugs and 2 gaskets.

  7. REMOVE STUD BOLT

    Note

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