CYLINDER HEAD REPLACEMENT

PROCEDURE

1. REPLACE INTAKE VALVE GUIDE BUSH

   
   

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

   2. Place the cylinder head on wooden blocks.

   3. 

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

      SST

      09201-10000   ( 09201-01050 )

      09950-70010   ( 09951-07100 )

   4. 

      Using a caliper gauge, measure the bush bore diameter of the cylinder head.

      Standard bush bore diameter
      10.285 to 10.306 mm (0.405 to 0.406 in.)

      Select New Guide Bush
      Bush Size Bush Diameter STD 10.333 to 10.344 mm (0.4068 to 0.4072 in.) O/S 0.05 10.383 to 10.394 mm (0.4088 to 0.4092 in.)

      If the valve guide bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the valve guide bush bore to diameter a diameter of 10.335 to 10.356 mm (0.407 to 0.408 in.) in order to install an O/S 0.05 valve guide bush. If the valve guide bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.

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

   6. Place the cylinder head on wooden blocks.

   7. 

      *a

      Height

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

      SST

      09201-10000   ( 09201-01050 )

      09950-70010   ( 09951-07100 )

      Standard protrusion height
      9.9 to 10.3 mm (0.390 to 0.406 in.)

   8. 

      Using a sharp 5.5 mm reamer, ream the valve guide bush to obtain the standard clearance between the valve guide bush and 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 to 80 to 100°C (176 to 212°F).

   2. Place the cylinder head on wooden blocks.

   3. 

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

      SST

      09201-10000   ( 09201-01050 )

      09950-70010   ( 09951-07100 )

   4. 

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

      Standard cylinder bore diameter
      10.285 to 10.306 mm (0.405 to 0.406 in.)

      Select New Guide Bush
      Bush Size Bush Diameter STD 10.333 to 10.344 mm (0.4068 to 0.4072 in.) O/S 0.05 10.383 to 10.394 mm (0.4088 to 0.4092 in.)

      If the valve guide bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the valve guide bush bore to a diameter of 10.335 to 10.356 mm (0.407 to 0.408 in.) in order to install an O/S 0.05 valve guide bush. If the valve guide bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.

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

   6. Place the cylinder head on wooden blocks.

   7. 

      *a

      Height

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

      SST

      09201-10000   ( 09201-01050 )

      09950-70010   ( 09951-07100 )

      Standard protrusion height
      11.15 to 11.55 mm (0.439 to 0.455 in.)

   8. 

      Using a sharp 5.5 mm reamer, ream the valve guide bush to obtain the standard oil clearance between the valve guide bush and 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 a ring pin unless it is being replaced.

   
   

   1. Remove the ring pins.

   2. 

      *a	Protrusion Height
      *b	Height
      *c	Width

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

      Standard Ring Pin
      Item Height Width Protrusion Ring pin 11.7 to 12.3 mm (0.461 to 0.484 in.) 12.0 mm (0.472 in.) 6.5 to 7.5 mm (0.256 to 0.295 in.)

4. REPLACE STUD BOLT

   Note

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

   
   

   1. Using an E8 "TORX" socket, install the stud bolts.

      

      *a

      Intake Side

      *b

      Exhaust Side

      Torque:

      9.5 N*m  { 97 kgf*cm, 84 in.*lbf }