Replacement
1UR-FSE ENGINE MECHANICAL: CYLINDER HEAD: REPLACEMENT
1. REPLACE INTAKE VALVE GUIDE BUSH
(a) Heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head on wooden blocks.
(c) Using SST and a hammer, tap out the valve guide bush.
SST : 09201-10000
09201-01050
SST : 09950-70010
09951-07100
(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head.
Standard cylinder bore diameter:
10.285 to 10.306 mm (0.4049 to 0.4057 in.)
If the bush bore diameter of the cylinder head is between 10.285 and 10.306 mm (0.4049 and 0.4057 in.), proceed to the next step.
If the bush bore diameter of the cylinder head is 10.356 mm (0.4077 in.) or more, replace the cylinder head.
(e) Select a new guide bush (STD or O/S 0.05), and measure its diameter.
(f) Machine the bush bore diameter of the cylinder head to the diameter of the selected guide bush.
Bush bore diameter:
(g) Heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(h) Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
Standard protrusion height:
14.3 to 14.7 mm (0.563 to 0.579 in.)
SST : 09201-10000
09201-01050
SST : 09950-70010
09951-07100
(i) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the specified clearance between the guide bush and valve stem.
2. REPLACE EXHAUST VALVE GUIDE BUSH
(a) Heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head on wooden blocks.
(c) Using SST and a hammer, tap out the valve guide bush.
SST : 09201-10000
09201-01050
SST : 09950-70010
09951-07100
(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head.
Standard cylinder bore diameter:
10.285 to 10.306 mm (0.4049 to 0.4057 in.)
If the bush diameter of the cylinder head is between 10.285 and 10.306 mm (0.4049 and 0.4057 in.), proceed to the next step.
If the bush bore diameter of the cylinder head is 10.356 mm (0.4077 in.) or more, replace the cylinder head.
(e) Select a new guide bush (STD or O/S 0.05), and measure its diameter.
(f) Machine the bush bore diameter of the cylinder head side to the diameter of the selected guide bush.
Bush bore diameter:
(g) Heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(h) Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
SST : 09201-10000
09201-01050
SST : 09950-70010
09951-07100
Standard protrusion height:
14.3 to 14.7 mm (0.563 to 0.579 in.)
(i) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the specified clearance between the guide bush and valve stem.
3. REPLACE RING PIN
NOTICE:
It is not necessary to remove the ring pins unless they are being replaced.
(a) Remove the ring pins.
(b) Using a plastic-faced hammer, tap in new ring pins until they stop.
Standard protrusion:
4. REPLACE STUD BOLT
NOTICE:
If a stud bolt is deformed or the threads are damaged, replace it.
(a) Remove the stud bolts.
(b) Using E6 and E8 "TORX" socket wrenches, install the stud bolts.
Torque : 9.0 Nm (92 kgf-cm, 80 in-lbf) for stud bolts A, B, C and D
