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Home >> Lexus >> 2007 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Cylinder Head Assembly >> Service and Repair >> Removal and Replacement >> Removal

Removal

CYLINDER HEAD

COMPONENTS (Part 1):




COMPONENTS (Part 2):




COMPONENTS (Part 3):




COMPONENTS (Part 4):




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COMPONENTS (Part 8):




COMPONENTS (Part 9):




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COMPONENTS (Part 11):




COMPONENTS (Part 12):




COMPONENTS (Part 13):




COMPONENTS (Part 14):




COMPONENTS (Part 15):




COMPONENTS (Part 16):





REMOVAL
1. DISCHARGE FUEL SYSTEM PRESSURE
2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

3. REMOVE TIMING BELT
(a) Remove the timing belt.

4. REMOVE IGNITION COIL





5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY RH
(a) Remove the bolt, and disconnect the wire clamp bracket from the camshaft bearing cap.
(b) Remove the bolt, and disconnect the engine wire protector from the cylinder head cover.
(c) Remove the 9 bolts, 9 seal washers and cylinder head cover.





6. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH
(a) Remove the bolt, and disconnect the wire clamp bracket from the camshaft bearing cap.
(b) Remove the 9 bolts, 9 seal washers and cylinder head cover.

7. DISCONNECT NO. 2 FUEL PIPE SUB-ASSEMBLY
8. REMOVE THROTTLE BODY ASSEMBLY
9. REMOVE INTAKE MANIFOLD ASSEMBLY
10. REMOVE WATER INLET HOUSING
11. REMOVE FRONT WATER BY-PASS JOINT
12. REMOVE REAR WATER BY-PASS JOINT
13. REMOVE WATER BY-PASS PIPE SUB-ASSEMBLY
14. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET
15. REMOVE CATALYST CONVERTER ASSEMBLY
16. REMOVE NO. 1 ENGINE HANGER
17. REMOVE NO. 2 ENGINE HANGER
18. REMOVE OIL DIPSTICK AND GUIDE
19. REMOVE CAMSHAFT POSITION SENSOR
20. REMOVE VVT SENSOR





21. WORK FOR PISTON AND VALVE DAMAGE PREVENTION
(a) Turn the crankshaft timing pulley counterclockwise by 45° and match the timing mark with the illustrated position.

HINT: When the No. 1 cylinder is positioned at 45° BTDC, the valve and piston do not interfere with each other even when the valve is fully open.

NOTICE: Be sure to match the cut part by turning it counterclockwise.

RH Bank:





22. REMOVE CAMSHAFT TIMING PULLEY SUB-ASSEMBLY RH
(a) Hold the crankshaft with a wrench, and remove the 4 bolts and timing pulley.

LH Bank:





23. REMOVE CAMSHAFT TIMING PULLEY SUB-ASSEMBLY LH
(a) Hold the crankshaft with a wrench, and remove the 4 bolts and timing pulley.





24. REMOVE REAR NO. 2 TIMING BELT PLATE RH
(a) Remove the 2 bolts and timing belt plate.





25. REMOVE REAR TIMING BELT PLATE RH
(a) Remove the bolt, stud bolt and timing belt plate.





26. REMOVE REAR NO. 2 TIMING BELT PLATE LH
(a) Remove the 2 bolts and timing belt plate.





27. REMOVE REAR TIMING BELT PLATE LH
(a) Remove the bolt, stud bolt and timing belt plate.

28. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY RH
29. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY LH
30. REMOVE CAMSHAFT

NOTICE: Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.





(a) Remove the camshafts of the RH bank.
(1) Bring the service bolt hole of the sub gear upward by turning the hexagon head portion of the No. 2 camshaft with a wrench.
(2) Secure the sub gear to the main gear with a service bolt.

Recommended service bolt:





HINT: When removing the camshaft, make sure that the torsional spring force of the sub gear has been eliminated by the above operation.





(3) Set a wrench to the hexagon head portion of the No. 2 camshaft. Rotate the wrench so that the timing mark (1 dot mark) on the camshaft main gear is moved approximately 10°, as shown in the illustration.





(4) Uniformly loosen the 22 bearing cap bolts in several passes in the sequence shown in the illustration.
(5) Remove the 22 bearing cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, camshaft housing plug, oil control valve filter and 2 camshafts.

31. REMOVE NO. 3 CAMSHAFT SUB-ASSEMBLY

NOTICE: Since the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being removed. If the camshaft is not kept level, the portion of the cylinder head receiving the shaft thrust may crack or be damaged, causing the camshaft to seize or break. To avoid this, the following steps should be carried out.





(a) Remove the camshafts of the LH bank.
(1) Bring the service bolt hole of the sub gear upward by turning the hexagon head portion of the exhaust No. 4 camshaft with a wrench.
(2) Secure the sub gear to the main gear with a service bolt.

Recommended service bolt:





HINT: When removing the camshaft, make sure that the torsional spring force of the sub gear has been eliminated by the above operation.





(3) Set a wrench to the hexagon head portion of the No. 4 camshaft. Rotate the wrench so that the timing marks (2 dot marks each) on the camshaft drive and driven main gears are aligned, as shown in the illustration.





(4) Uniformly loosen the 22 bearing cap bolts in several passes in the sequence shown in the illustration.
(5) Remove the 22 bearing cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, camshaft housing plug, oil control valve filter and 2 camshafts.

NOTICE:
^ Do not forcibly pry the camshaft with a tool.
^ Do not damage the reception part of the thrust on the cylinder head side.

RH Bank:





32. REMOVE CYLINDER HEAD SUB-ASSEMBLY
(a) Uniformly loosen the 10 cylinder head bolts on the cylinder head in several passes, in the sequence shown in the illustration. Remove the 10 cylinder head bolts and plate washers.

NOTICE: Be careful not to drop washers into the cylinder head.

(b) Remove the cylinder head together with the exhaust manifold.

33. REMOVE CYLINDER HEAD GASKET
34. REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR
(a) Remove the 4 bolts and heat insulator.





35. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY RH
(a) Remove the 8 nuts, exhaust manifold and gasket.





36. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY RH
(a) Using a precision straightedge and feeler gauge, measure the surface contacting the cylinder head for warpage.
Maximum warpage: 0.50 mm (0.0197 in.)
If the warpage is greater than the maximum, replace the manifold.

LH Bank:





37. REMOVE CYLINDER HEAD LH
(a) Uniformly loosen the 10 cylinder head bolts on the cylinder head in several passes in the sequence shown in the illustration. Remove the 10 cylinder head bolts and plate washers.

NOTICE: Be careful not to drop the washers into the cylinder head.

(b) Remove the cylinder head together with the exhaust manifold.

38. REMOVE NO. 2 CYLINDER HEAD GASKET
39. REMOVE NO. 2 WIRING HARNESS HEAT INSULATOR
40. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR
(a) Remove the 4 bolts and heat insulator.





41. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY LH
(a) Remove the 8 nuts, exhaust manifold and gasket.





42. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY LH
(a) Using a precision straightedge and feeler gauge, measure the surface contacting the cylinder head for warpage.
Maximum warpage: 0.50 mm (0.0197 in.)
If the warpage is greater than the maximum, replace the manifold.

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