3Uz-Fe Engine Mechanical. Cylinder Head Removal

Engine. Lexus Gs430, Gs300. Uzs190 Grs190

3Uz-Fe Engine Mechanical. Lexus Gs430, Gs300. Uzs190 Grs190

DISCHARGE FUEL SYSTEM PRESSURE
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
REMOVE TIMING BELT
REMOVE IGNITION COIL
REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY RH
REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH
WORK FOR PISTON AND VALVE DAMAGE PREVENTION
REMOVE CAMSHAFT TIMING PULLEY
REMOVE CAMSHAFT TIMING PULLEY SUB-ASSEMBLY LH
REMOVE REAR NO. 2 TIMING BELT PLATE RH
REMOVE REAR TIMING BELT PLATE RH
REMOVE REAR NO. 2 TIMING BELT PLATE LH
REMOVE REAR TIMING BELT PLATE LH
REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY RH
REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY LH
REMOVE CAMSHAFT
REMOVE NO. 2 CAMSHAFT
REMOVE NO. 3 CAMSHAFT SUB-ASSEMBLY
REMOVE NO. 4 CAMSHAFT SUB-ASSEMBLY
REMOVE NO. 2 FUEL PIPE SUB-ASSEMBLY
REMOVE INTAKE MANIFOLD ASSEMBLY
REMOVE REAR WATER BY-PASS JOINT
REMOVE WATER INLET HOUSING
REMOVE FRONT WATER BY-PASS JOINT
REMOVE FRONT TWC
REMOVE NO. 1 ENGINE HANGER
REMOVE NO. 2 ENGINE HANGER
REMOVE CYLINDER HEAD SUB-ASSEMBLY
REMOVE CYLINDER HEAD GASKET
REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR
REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY RH
INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY RH
REMOVE CYLINDER HEAD LH
REMOVE NO. 2 CYLINDER HEAD GASKET
REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR
REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY LH
INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY LH

Cylinder Head -- Removal

1. DISCHARGE FUEL SYSTEM PRESSURE

NOTICE:

Perform the following procedures to prevent fuel from spilling out before removing any fuel system parts.

Pressure will still remain in the fuel line even after performing the following procedures. When disconnecting the fuel line, cover it with a shop rag or a piece of cloth to prevent fuel from spraying.

Remove the F/PMP fuse.
1. Remove the engine room No. 2 relay block cover upper.
2. Remove the F/PMP fuse.
3. Start the engine.
4. After the engine has stopped, turn the engine switch off.
  HINT:
  DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected.
5. Crank the engine again. Check that the engine does not start.
6. Remove the fuel tank cap to discharge pressure from the fuel tank.
7. Reinstall the F/PMP fuse.

Disconnect the fuel pump connector.
1. Remove the rear seat cushion.
2. Remove the rear floor service hole cover.
3. Disconnect the fuel pump connector.
4. Start the engine.
5. After the engine has stopped, turn the engine switch off.
  HINT:
  DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected.
6. Crank the engine again. Check that the engine does not start.
7. Remove the fuel tank cap to discharge pressure from the fuel tank.
8. Reconnect the fuel pump connector.
9. Install the rear floor service hole cover.
10. Install the rear seat.

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

Remove the timing belt (Click here).

4. REMOVE IGNITION COIL

Disconnect the ignition coil connector.

Remove the bolt and pull out the ignition coil.

5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY RH

Remove the bolt, and disconnect the wire clamp bracket from the camshaft bearing cap.

Remove the bolt, and disconnect the engine wire protector from the cylinder head cover.

Remove the 9 bolts, 9 seal washers and cylinder head cover.

6. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH

Remove the bolt, and disconnect the wire clamp bracket from the camshaft bearing cap.

Remove the 9 bolts, 9 seal washers and cylinder head cover.

7. WORK FOR PISTON AND VALVE DAMAGE PREVENTION

Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head Removal

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.

8. REMOVE CAMSHAFT TIMING PULLEY

Hold the crankshaft with a wrench, and remove the 4 bolts and timing pulley.

9. REMOVE CAMSHAFT TIMING PULLEY SUB-ASSEMBLY LH

Hold the crankshaft with a wrench, and remove the 4 bolts and timing pulley.

10. REMOVE REAR NO. 2 TIMING BELT PLATE RH

Remove the 2 bolts and timing belt plate.

11. REMOVE REAR TIMING BELT PLATE RH

Remove the bolt, stud bolt and timing belt plate.

12. REMOVE REAR NO. 2 TIMING BELT PLATE LH

Remove the 2 bolts and timing belt plate.

13. REMOVE REAR TIMING BELT PLATE LH

Remove the bolt, stud bolt and timing belt plate.

14. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY RH

Disconnect the oil control valve connector.

Remove the bolt and oil control valve.

Remove the O-ring from the oil control valve.

15. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY LH

Disconnect the oil control valve connector.

Remove the bolt and oil control valve.

Remove the O-ring from the oil control valve.

16. 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.

Bring the service bolt hole of the sub gear upward by turning the hexagon head portion of the No. 2 camshaft with a wrench.

Secure the sub gear to the main gear with a service bolt.
Recommended service bolt:
Thread diameter
Thread pinch
Bolt length
6 mm
1.0 mm
16 to 20 mm (0.63 to 0.79 in.)
HINT:
When removing the camshaft, make sure that the torsional spring force of the sub gear has been eliminated by the above operation.

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.

Uniformly loosen the 22 bearing cap bolts in several passes in the sequence shown in the illustration.

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

17. REMOVE NO. 2 CAMSHAFT

NOTICE:

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:
  Thread diameter
  Thread pinch
  Bolt length
  6 mm
  1.0 mm
  16 to 20 mm (0.63 to 0.79 in.)
  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.

18. REMOVE NO. 3 CAMSHAFT SUB-ASSEMBLY

NOTICE:

Bring the service bolt hole of the sub gear upward by turning the hexagon head portion of the exhaust camshaft with a wrench.

Secure the sub gear to the main gear with a service bolt.
Recommended service bolt:
Thread diameter
Thread pinch
Bolt length
6 mm
1.0 mm
16 to 20 mm (0.63 to 0.79 in.)
HINT:
When removing the camshaft, make sure that the torsional spring force of the sub gear has been eliminated by the above operation.

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.

Uniformly loosen the 22 bearing cap bolts in several passes in the sequence shown in the illustration.

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

19. REMOVE NO. 4 CAMSHAFT SUB-ASSEMBLY

NOTICE:

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:
  Thread diameter
  Thread pinch
  Bolt length
  6 mm
  1.0 mm
  16 to 20 mm (0.63 to 0.79 in.)
  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:
  1. Do not forcibly pry the camshaft with a tool.
  2. Do not damage the reception part of the thrust on the cylinder head side.

20. REMOVE NO. 2 FUEL PIPE SUB-ASSEMBLY

Remove the No. 2 fuel pipe clamp.

Disconnect the fuel tube connector connected to the fuel main tube, then pinch and pull the connector.

21. REMOVE INTAKE MANIFOLD ASSEMBLY

Remove the manifold (Click here).

22. REMOVE REAR WATER BY-PASS JOINT

Disconnect the heater inlet hose from the water by-pass joint.

Remove the 4 nuts, water by-pass joint and 2 gaskets.

23. REMOVE WATER INLET HOUSING

Remove the 2 bolts and inlet housing.

24. REMOVE FRONT WATER BY-PASS JOINT

Disconnect the ECT sensor connector.

Remove the 4 nuts, water by-pass joint and 2 gaskets.

25. REMOVE FRONT TWC

Remove the 6 nuts, 2 TWCs and 2 gaskets.

26. REMOVE NO. 1 ENGINE HANGER

Remove the 2 bolts and engine hanger.

27. REMOVE NO. 2 ENGINE HANGER

Remove the 2 bolts and engine hanger.

28. REMOVE CYLINDER HEAD SUB-ASSEMBLY

Uniformly loosen the 10 cylinder head bolts on the cylinder head in several passes, in the sequence shown. Remove the 10 cylinder head bolts and plate washers.
NOTICE:
Be careful not to drop washers into the cylinder head.

Remove the cylinder head together with the exhaust manifold.

29. REMOVE CYLINDER HEAD GASKET

30. REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR

Remove the 4 bolts and heat insulator.

31. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY RH

Remove the 8 nuts, exhaust manifold and gasket.

32. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY RH

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.

33. REMOVE CYLINDER HEAD LH

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.

Remove the cylinder head together with the exhaust manifold.

34. REMOVE NO. 2 CYLINDER HEAD GASKET

35. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR

Remove the 4 bolts and heat insulator.

36. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY LH

Remove the 8 nuts, exhaust manifold and gasket.

37. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY LH

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.

Thread diameter	Thread pinch	Bolt length
6 mm	1.0 mm	16 to 20 mm (0.63 to 0.79 in.)