2. Remove the following parts so that the crankshaft can be turned.
a) Remove the accessory drive belt (see chapter "Maintenance and general check and adjustment procedures").
b) Remove the cooling system fan (see chapter "Cooling system").
c) Remove the coolant pump pulley.
3. Remove the injectors (see chapter "Fuel injection system").
4. Remove the cylinder head cover.
5. Turn the engine crankshaft clockwise so that the piston in the first cylinder is in the TDC position on the compression stroke.
6. Measure the clearances in the valve drive marked with the letter "A" in the figure. Write down the measured values on paper.
7. Turn the crankshaft clockwise 360° so that the piston of the fourth cylinder is in the TDC position of the compression stroke.
8. Measure the clearances in the valve drive marked with the letter "B" in the figure. Write down the measured values on paper.
Nominal clearance (on a cold engine):
- inlet valves - 0.10-0.16 mm
- exhaust valves - 0.17-0.20 mm
If the valve clearances are not within specifications, adjust them.
a) Install the camshaft (turning the crankshaft clockwise) to a position where the camshaft lobe will fully press on the rocker arm of the valve whose clearance needs to be adjusted. Loosen the lock nut and adjusting screw.
Caution: Loosen the lock nut and adjusting screw only when the camshaft lobe fully presses the rocker arm as shown in the figure. Otherwise, when the crankshaft rotates, the bearing part of the rocker arm that contacts the valve may be damaged.
b) Turn the crankshaft to set the piston in the corresponding cylinder to TDC on the compression stroke.
Note: to adjust the clearances in the valves marked in the figure with the letters "A", the piston in cylinder No.1 should be set to TDC on the compression stroke, and to adjust the clearances in the valves marked in the figure with the letters "B", the piston in cylinder No.4 should be set to TDC on the compression stroke (see the figure in point "6").
c) Turn the adjusting screw to set the required clearance in the valve drive of the corresponding cylinder.
d) Tighten the lock nut and recheck the valve clearance.
- Tightening torque: 20-24 Nm
d) Rotate the crankshaft 360° and check the valve clearance. Repeat the adjustment if necessary.
9. Install the cylinder head cover (see section "Cylinder head").
10. Next, install the parts in the reverse order of removal.
WL engine.
1 - engine assembly,
2 - drive belts of attachments,
3 - timing belt,
4 - rocker arm,
5 - cylinder head gasket,
6 - front crankshaft oil seal,
7 - rear crankshaft oil seal.