Removal
1. Disconnect the negative battery terminal.
2. Drain the coolant from the engine.
3. Remove the suction hose between the air cleaner and the valve cover.
4. Remove the air cleaner.
5. Remove the timing belt cover.
6. Remove the valve cover and crankshaft angle sensor.
7. Loosen the camshaft timing gear bolt and remove the timing gear.
8. Loosen the bearing cap mounting bolts and remove them, as well as the camshafts, rocker arms and adjusting bolts.
Examination
Rocker arms
1. Check the roller rotation. If it does not rotate freely or if there is a lot of play, replace the rocker arm.
2. Check the roller. If there are dents, damage or sticking, replace the roller.
3. Check the valve contact surface and replace if damaged.
Camshafts
1. Check the camshaft journals for wear. If the journals are heavily worn, replace the camshaft.
2. Check the cam lobe for damage. If the lobe is damaged or severely worn, replace the camshaft.
| Cam height (normal) | |
| Inlet valve | 35,493 mm |
| Exhaust valve | 35,200 mm |
| Cam height (maximum) | |
| Inlet valve | 34,993 mm |
| Exhaust valve | 34,700 mm |
Installation
1. Install the camshafts into the cylinder head.
Note.
- 1. Lubricate the camshaft journals and cams with engine oil.
- 2. The intake camshaft has a slot on the rear end to drive the crankshaft position sensor.
2. Install the bearing caps. Observe the markings on the caps to identify the intake and exhaust camshafts.
L: Intake camshaft
R: exhaust camshaft
3. Make sure the camshaft rotates easily by hand. After checking, remove the bearing caps and camshafts
shafts, then install the valve rocker arms.
4. Make sure that the dowel pins on the ends of the camshafts are facing upward.
5. Tighten the bearing caps to the specified torque in two or three steps in the sequence shown in the figure.
- Tightening torque of rocker arm bolts: 19-21 Nm
6. Using a special device for installing camshaft seals and guides (09221-21000, 09221-21100) press the camshaft oil seal into place. Apply engine oil to the outside of the oil seal. Position the oil seal on the front end of the camshaft and install it by moving the seal installer with a hammer until the seal is fully seated.
7. Install the camshaft timing gears and tighten the bolts to the specified torque.
- Tightening torque of camshaft gear bolts: 80-100 Nm
8. Install the valve cover. Use the sealing material as shown in the figure.
- The tightening torque of the valve cover bolts is 2.5-3.5 Nm.
Sealing material:
- part A: Threebond No.10 or equivalent
- part B: Threebond No.1212D or equivalent
Bolt length x diameter
: 25mm x 6mm
: 20mm x 6mm
: 15mm x 6mm
9. Install the spark plugs, center spring and rubber as shown in the figure.
10. Position the intake camshaft so that the timing pin for the timing gear faces up.
11. Align the mark stamped on the crankshaft position sensor housing with the slot in the plate.
12. Install the crankshaft sensor on the cylinder head.
Note: The crankshaft position sensor can be installed even if the mark on the housing is located on the opposite side from the slot, however, this will result in incorrect fuel injection and ignition timing.