Replacement
1UR-FE 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 Head Inside Diameter:
(e) Select a new valve guide bush.
New Valve Guide Bush:
If the bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the bush bore diameter to between 10.335 and 10.356 mm (0.4069 and 0.4077 in.).
If the bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.
HINT
Standard bush length: 41.3 to 41.7 mm (1.63 to 1.64 in.)
(f) Using SST and a hammer, tap in a new guide bush to the standard 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.)
(g) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard oil clearance between the 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
(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 Head Inside Diameter:
(e) Select a new valve guide bush.
New Valve Guide Bush:
If the bush bore diameter of the cylinder head is more than 10.306 mm (0.406 in.), machine the bush bore diameter to between 10.335 and 10.356 mm (0.4069 and 0.4077 in.).
If the bush bore diameter of the cylinder head is more than 10.356 mm (0.408 in.), replace the cylinder head.
HINT
Standard bush length: 46.8 to 47.2 mm (1.84 to 1.86 in.)
(f) Using SST and a hammer, tap in a new guide bush to the standard 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.)
(g) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard oil clearance between the guide bush and valve stem.
Standard oil clearance:
0.030 to 0.065 mm (0.00118 to 0.00256 in.)
3. REPLACE SPARK PLUG TUBE
HINT
When using a new cylinder head, the spark plug tubes must be replaced.
(a) Remove the spark plug tube.
(b) Apply adhesive to the end of a new spark plug tube.
Adhesive:
Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent.
Standard seal diameter:
15 mm (0.591 in.)
NOTICE:
* Install the spark plug tube within 3 minutes after applying adhesive.
* Be careful not to deform the spark plug tube.
* Be careful not to expose the seal to coolant for at least 1 hour after installing it.
(c) Using a wooden block and hammer, tap in the spark plug tube to the specified protrusion height.
Standard protrusion height:
75.1 to 76.1 mm (2.96 to 3.00 in.)
NOTICE:
To avoid tapping in the spark plug tube too far, measure the protrusion height while tapping it.
4. REPLACE RING PIN
NOTICE:
It is not necessary to remove the ring pin unless it is being replaced.
(a) Remove the ring pins.
(b) Using a plastic-faced hammer, tap in new ring pins to the cylinder head.
Standard Ring Pin:
