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.

      CAUTION:

      Be sure to wear protective gloves.

   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 intake valve guide bush bore diameter of the cylinder head sub-assembly.

      Standard Intake Valve Guide Bush Bore Diameter
      10.285 to 10.306 mm (0.4049 to 0.4057 in.)

      Select a new intake valve guide bush (STD or O/S 0.05)
      Bush Size Bush Bore 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 intake valve guide bush bore diameter is more than 10.306 mm (0.4057 in.), machine the intake valve guide bush bore to a dimension of 10.335 to 10.356 mm (0.4069 to 0.4077 in.) to install an O/S 0.05 intake valve guide bush.

      If the intake valve guide bush bore diameter of the cylinder head sub-assembly is more than 10.356 mm (0.4077 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.

      CAUTION:

      Be sure to wear protective gloves.

   7. 

      *a	Protrusion Height

      Using SST, tap in a new intake valve guide bush.

      SST

      09201-10000   ( 09201-01050 )

      09950-70010   ( 09951-07100 )

      Standard Protrusion Height
      9.30 to 9.70 mm (0.3661 to 0.3819 in.)

   8. 

      Using a sharp 5.5 mm reamer, ream the intake valve guide bush to obtain the specified oil clearance.

      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.

      CAUTION:

      Be sure to wear protective gloves.

   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 exhaust valve guide bush bore diameter of the cylinder head sub-assembly.

      Standard Exhaust Valve Guide Bush Bore Diameter
      10.285 to 10.306 mm (0.4049 to 0.4057 in.)

      Select a new exhaust valve guide bush (STD or O/S 0.05)
      Bush Size Bush Bore 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 exhaust valve guide bush bore diameter is more than 10.306 mm (0.4057 in.), machine the exhaust valve guide bush bore to a dimension of 10.335 to 10.356 mm (0.4069 to 0.4077 in.) to install an O/S 0.05 exhaust valve guide bush.

      If the exhaust valve guide bush bore diameter of the cylinder head sub-assembly is more than 10.356 mm (0.4077 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.

      CAUTION:

      Be sure to wear protective gloves.

   7. 

      *a	Protrusion Height

      Using SST, 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
      9.30 to 9.70 mm (0.3661 to 0.3819 in.)

   8. 

      Using a sharp 5.5 mm reamer, ream the exhaust valve guide bush to obtain the specified oil clearance.

      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. 

      *A	for Bank 1
      *B	for Bank 2

      Using a plastic hammer, tap in new ring pins.

      Standard Protrusion Height
      2.5 to 3.5 mm (0.0984 to 0.138 in.)

4. REPLACE STUD BOLT

   Note

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

   
   

   1. Using E6 and E8 "TORX" socket wrenches, install the stud bolts.

      

      *A	Bank 1 Rear Side	*B	Bank 1 Intake Side
      *C	Bank 2 Intake Side	*D	Bank 1 Exhaust Side
      *E	Bank 2 Exhaust Side	*F	Bank 2 Rear Side

      Torque:

      Bolt (A) and (B)

      10 N*m  { 102 kgf*cm, 7 ft.*lbf }

      Bolt (C)

      4.0 N*m  { 41 kgf*cm, 35 in.*lbf }

5. REPLACE STRAIGHT PIN

   Note

   If a straight pin is deformed, replace it.

   
   

   1. Using a plastic hammer, tap in new straight pins as shown in the illustration.

      

      *A

      for Bank 1

      *B

      for Bank 2

      Standard Protrusion Height
      17.5 to 19.5 mm (0.689 to 0.768 in.)