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Home >> Lexus >> 2008 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Cylinder Head Assembly >> Service and Repair >> Replacement
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Replacement








3UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REPLACEMENT

REPLACEMENT

1. REMOVE INTAKE VALVE GUIDE BUSH






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






(b) Using SST and a hammer, tap out the guide bush.
SST: 09201-01055
SST: 09950-70010
09951-07100
2. INSTALL INTAKE VALVE GUIDE BUSH






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






(b) Select a new guide bush (STD or O/S 0.05).
Bush bore diameter:





- If the bush bore diameter of the cylinder head is greater than 10.306 mm (0.4057 in.), machine the bush bore diameter to between 10.335 and 10.356 mm (0.4068 to 0.4077 in.).
- If the bush bore diameter of the cylinder head is greater than 10.356 mm (0.4077 in.), replace the cylinder head.
HINT: Different bushes are used for the intake and exhaust.

Intake bush length:
34.5 mm (1.358 in.)






(c) Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(d) Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
SST: 09201-01055
SST: 09950-70010
09951-07100
Protrusion height (H):
9.2 to 9.8 mm (0.362 to 0.386 in.)






(e) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard specified clearance between the guide bush and valve stem.
3. REMOVE EXHAUST VALVE GUIDE BUSH






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






(b) Using SST and a hammer, tap out the guide bush.
SST: 09201-01055
SST: 09950-70010
09951-07100
4. INSTALL EXHAUST VALVE GUIDE BUSH






(a) Using a caliper gauge, measure the bush bore diameter of the cylinder head.
(b) Select a new guide bush (STD or O/S 0.05).
Bush bore diameter:





HINT:
- If the bush bore diameter of the cylinder head is greater than 10.306 mm (0.4057 in.), machine the bush bore diameter to between 10.335 and 10.356 mm (0.4068 to 0.4077 in.).
- If the bush bore diameter of the cylinder head is greater than 10.356 mm (0.4077 in.), replace the cylinder head.
HINT: Different bushes are used for the intake and exhaust.

Exhaust bush length:
40.5 mm (1.594 in.)






(c) Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212°F).
(d) Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
SST: 09201-01055
SST: 09950-70010
09951-07100
Protrusion height (H):
8.2 to 8.8 mm (0.323 to 0.346 in.)






(e) Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard specified clearance between the guide bush and valve stem.
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