Replacement

2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REPLACEMENT

REPLACEMENT

1. REPLACE INTAKE VALVE GUIDE BUSH

(a) Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head on wooden blocks.

(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head.
Standard cylinder bore diameter:
10.285 to 10.306 mm (0.405 to 0.406 in.)
If the bush bore diameter of the cylinder head is between 10.285 to 10.306 mm (0.405 to 0.406 in.), proceed to the next step.
If the bush bore diameter of the cylinder head is 10.356 mm (0.408 in.) or more, replace the cylinder head.

(e) Select a new guide bush (STD or O/S 0.05).
HINT: Different bushes are used for the intake and exhaust.

Standard bush length:

(f) Machine the bush bore diameter of the cylinder head side to the diameter of the selected guide bush.
Bush bore diameter:

(g) Gradually 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:
9.2 to 9.8 mm (0.362 to 0.386 in.)

(i) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard clearance between the guide bush and valve stem.
2. REPLACE EXHAUST VALVE GUIDE BUSH

(a) Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head on wooden blocks.

(e) Select a new guide bush (STD or O/S 0.05).
HINT: Different bushes are used for the intake and exhaust.

Standard bush length:

(f) Machine the bush bore diameter of the cylinder head side to the diameter of the selected guide bush.
Bush bore diameter:

(g) Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212°F).

(i) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard clearance between the guide bush and valve stem.
3. REPLACE SPARK PLUG TUBE

HINT: When using a new cylinder head, the spark plug tubes must be replaced.

(a) Remove the spark plug tubes.
(b) Apply adhesive to the end of a new spark plug tube.
Standard seal diameter:
15 mm (0.591 in.)
Adhesive:
Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent.
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 tube until it is protruding 40.9 to 42.1 mm (1.61 to 1.66 in.) from the camshaft bearing cap installation surface of the cylinder head.
NOTE: To avoid tapping in a new spark plug tube too far, measure the protrusion height while tapping it.

4. REPLACE RING PIN
NOTE: It is not necessary to remove the ring pin unless it is being replaced.

(a) Remove the ring pin.
(b) Using a plastic-faced hammer, tap in new ring pins until they stop.