| Last Modified: 11-29-2007 | 1.6 A | |
| Service Category: Engine/Hybrid System | Section: Engine Mechanical | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002WGF007X |
| Title: 2UZ-FE ENGINE MECHANICAL: CAMSHAFT: REMOVAL (2008 Sequoia) | ||
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 disable the SRS system.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected
.
3. DRAIN ENGINE OIL
4. REMOVE TIMING BELT
(a) Remove the timing belt
.
5. DISCONNECT VACUUM HOSE ASSEMBLY
6. REMOVE FUEL PIPE CLAMP
7. DISCONNECT NO. 2 FUEL PIPE SUB-ASSEMBLY
8. DISCONNECT NO. 1 FUEL PIPE SUB-ASSEMBLY
9. REMOVE FUEL PRESSURE PULSATION DAMPER ASSEMBLY
10. REMOVE AIR SWITCHING VALVE ASSEMBLY
(a) Remove the air switching valve assembly
11. SEPARATE ENGINE WIRE
(a) Remove the nut and disconnect the wire from the positive (+) battery terminal.
(b) Disconnect the positive (+) battery terminal.
(c) Remove the bolt and disconnect the ground wire.
(d) Disconnect the 4 air injection control driver connectors.
(e) Remove the nut and disconnect the wire from the engine room junction block.
(f) Disconnect the 3 connectors from the engine room junction block.
12. REMOVE IGNITION COIL ASSEMBLY
13. REMOVE SPARK PLUG
14. DISCONNECT NO. 5 WATER BY-PASS HOSE
(a) Disconnect the No. 5 water by-pass hose from the No. 3 water by-pass pipe.
15. DISCONNECT INLET HEATER WATER HOSE D
(a) Disconnect the inlet heater water hose D from the No. 3 water by-pass pipe.
16. REMOVE NO. 1 WATER BY-PASS PIPE
17. REMOVE VENTILATION HOSE
(a) Remove the ventilation hose.
18. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH
(a) Remove the 9 bolts, cylinder head cover and gasket.
19. REMOVE CAMSHAFT POSITION SENSOR ASSEMBLY
20. REMOVE CAMSHAFT TIMING PULLEY SUB-ASSEMBLY LH
|
(a) Hold the hexagonal portion of the camshaft with a wrench and remove the 4 bolts indicated by the arrows in the illustration and timing pulley. NOTICE:
|
21. REMOVE REAR TIMING BELT PLATE LH
(a) Remove the 3 bolts, No. 1 timing belt plate and No. 2 timing belt plate.
22. REMOVE CAMSHAFT SUB-ASSEMBLY (for Bank 1)
NOTICE:
As the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. If the camshaft is not kept level, the portion of the cylinder head which receives the shaft thrust may crack or be damaged. To avoid this, the following steps should be carried out.
|
(a) Check that the timing mark of the crankshaft timing pulley is in the position shown in the illustration, and that the piston is below the TDC of compression. NOTICE:
Having the crankshaft pulley at a wrong angle can cause the piston head and valve head to come into contact with each other when removing the camshaft. Always set the crankshaft pulley at the correct angle as shown in the illustration. |
|
(b) Bring the service bolt hole of the sub-gear upward by turning the hexagonal portion of the exhaust camshaft with a wrench. |
(c) Secure the sub-gear to the main gear with a service bolt.
Recommended Service Bolt:
|
Thread Diameter |
Thread Pitch |
Bolt Length |
|---|---|---|
|
6.0 mm |
1.0 mm |
16 to 20 mm (0.630 to 0.787 in.) |
HINT:
When removing the camshafts, make sure that the torsional spring force of the sub-gear has been eliminated by the above operation.
|
(d) Using a wrench, turn the camshaft so that the timing marks (2 dot marks each) on the camshaft drive and driven main gears are aligned, as shown in the illustration. |
|
(e) Uniformly loosen and remove the 22 bearing cap bolts in several steps, in the order shown in the illustration. |
|
(f) Remove the cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, camshaft housing plug, oil control valve filter and camshafts. NOTICE:
HINT:
Arrange the bearing caps in the correct order. |
23. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY
(a) Remove the 9 bolts, cylinder head cover and gasket.
24. REMOVE CAMSHAFT TIMING PULLEY
(a) Hold the hexagonal portion of the camshaft with a wrench and remove the 4 bolts indicated by the arrows in the illustration and timing pulley.
NOTICE:
- Do not loosen or remove the 4 bolts that are not indicated by the arrows in the illustration. If any of them are loosened or removed, the backlash of the gear in the timing tube will go out of adjustment. In this case, replace the timing tube assembly with a new one.
- Be careful not to damage the cylinder head with the wrench.
25. REMOVE REAR TIMING BELT PLATE RH
(a) Remove the 4 bolts, No. 2 timing belt plate and No. 1 timing belt plate.
26. REMOVE CAMSHAFT (for Bank 2)
NOTICE:
As the thrust clearance of the camshaft is small, the camshaft must be kept level while it is being installed. If the camshaft is not kept level, the portion of the cylinder head which receives the shaft thrust may crack or be damaged. To avoid this, the following steps should be carried out.
|
|
(a) Check that the timing mark of the crankshaft timing pulley is in the position shown in the illustration, and that the piston is below the TDC of compression. NOTICE:
Having the crankshaft pulley at a wrong angle can cause the piston head and valve head to come into contact with each other when removing the camshaft. Always set the crankshaft pulley at the correct angle as shown in the illustration. |
|
(b) Bring the service bolt hole of the sub-gear upward by turning the hexagonal portion of the exhaust camshaft with a wrench. |
(c) Secure the sub-gear to the main gear with a service bolt.
Recommended Service Bolt:
|
Thread Diameter |
Thread Pitch |
Bolt Length |
|---|---|---|
|
6.0 mm |
1.0 mm |
16 to 20 mm (0.630 to 0.787 in.) |
HINT:
When removing the camshafts, make sure that the torsional spring force of the sub-gear has been eliminated by the above operation.
|
(d) Using a wrench, turn the camshaft so that the timing marks (1 dot marks each) on the camshaft drive and driven main gears are aligned, as shown in the illustration. |
|
(e) Uniformly loosen and remove the 22 bearing cap bolts in several steps, in the order shown in the illustration. |
|
(f) Remove the cap bolts, 4 seal washers, oil feed pipe, 9 bearing caps, camshaft housing plug, oil control valve filter and camshafts. NOTICE:
HINT:
Arrange the bearing caps in the correct order. |
27. REMOVE CAMSHAFT TIMING TUBE ASSEMBLY
(a) Mount the hexagonal portion of the camshaft in a vise.
NOTICE:
- Be careful not to damage the camshaft.
- Do not loosen or remove the 4 bolts shown in the illustration. If any of them are loosened or removed, the backlash of the gear in the timing tube will go out of adjustment. In this case, replace the timing tube assembly with a new one.
(b) Remove the screw plug and seal washer.
|
(c) Using a 10 mm hexagon wrench, remove the bolt. |
(d) Pull out the timing tube and drive gear assembly from the camshaft.
|
(e) Using SST and a 5 mm hexagon wrench, remove the 4 bolts, drive gear and oil seal. SST: 09960-10010 09962-01000 09963-00500 NOTICE:
Be careful not to damage the timing tube. |
28. REMOVE NO. 3 CAMSHAFT SUB GEAR
(a) Mount the hexagonal portion of the camshaft in a vise.
NOTICE:
Be careful not to damage the camshaft.
|
(b) Using SST, turn the sub-gear clockwise, and remove the service bolt. SST: 09960-10010 09962-01000 09963-00500 |
|
(c) Using snap ring pliers, remove the snap ring. |
(d) Remove the wave washer, sub-gear and gear spring.
|
|