Withdrawal
1. Disconnect the negative battery terminal.
2. Drain the engine coolant.
3. Remove suction hose between air cleaner and valve cover.
4. Remove the air cleaner.
5. Remove the toothed belt cover.
6. Remove the valve cover and crank angle sensor.
7. Loosen the camshaft sprocket bolt and remove the sprocket.
8. Release the bearing cap bolts and remove them, as well as the camshafts, rocker arms and adjusting bolts.
Examination
Rocker arms
1. Check roller rotation. If it does not turn freely or if there is a lot of play, replace the rocker arm.
2. Check the roller. If there are dents, damage, or binding, 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 worn, replace the camshaft.
2. Check the lobes of the cams for damage. If the lugs are damaged or badly worn, replace the camshaft.
Cam Height (normal) | |
Inlet valve | 35.493 mm |
Exhaust valve | 35.200 mm |
Cam Height (ultimate) | |
Inlet valve | 34.993 mm |
Exhaust valve | 34.700 mm |
Installation
1. Install the camshafts in the cylinder head.
Note.
- 1. Lubricate the necks and cams of the camshafts with engine oil.
- 2. The intake camshaft has a slot on the rear end to drive the crankshaft position sensor.
2. Install bearing caps. Follow the markings on the caps to identify the intake and exhaust camshafts.
L: intake camshaft
R: exhaust camshaft
3. Make sure that the camshaft rotates easily by hand. After checking, remove the bearing caps and distribution shafts, then install the rocker arms.
4. Make sure that the dowel pins on the ends of the camshafts are facing up.
5. Tighten the bearing caps to the required torque in two or three steps in the sequence shown in the figure.
- The torque of the rocker bolts is 19-21 Nm
6. Using a special device for installing camshaft oil seals and guides (09221-21000, 09221-21100) press in the camshaft seal. Apply engine oil to the outer surface of the oil seal. Position the oil seal on the front end of the camshaft and install it by moving the oil seal installer with a hammer until the seal is fully seated.
7. Establish cogwheels of camshafts and tighten bolts the demanded moment.
- Tightening torque of the camshaft gear bolts - 80-100 Nm
8. Install the valve cover. Use the sealing material as shown in the illustration.
- 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 spark plugs, center spring and rubber as shown.
10. Position the intake camshaft so that the locating pin for the cogwheel is facing up.
11. Align the mark embossed 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 of the slot, however, incorrect fuel injection and ignition timing will result.