Note: Work only on a cold engine.
1. Remove the intake pipe.
2. Remove the protective cover of the cylinder head (If installed).
3. Remove the valve cover of the cylinder head.
4. Set the piston of the first cylinder to TDC.
A) By turning the crankshaft pulley clockwise, align its groove with the benchmark.
b) The cams of the first cylinder should be directed upwards, the fourth downwards.
If the specified condition is not met, then turn the crankshaft one revolution (360°) and align the label as above.
5. Adjustment of the thermal gap.
A) Check only the valves marked in the figure.
Measure the clearance between the valve lifter and the camshaft with a flat feeler gauge.
Record valve clearance measurements that are out of specification. These records will be used to determine the thickness of the shim.
gaps (cold engine):
- Inlet valve - 0.20 - 0.30 mm
- Exhaust valve - 0.40 - 0.50 mm
b) Rotate the crankshaft one turn (360°) and align the label as above.
V) Measure the clearances of the valves marked in the figure.
G) Remove the adjusting washer.
Rotate the crankshaft until the cam lobe points up.
Using the special tool, press the valve lifter down.
Recommendation: Before pushing the valve lifter, position the groove on the tappet on the exhaust manifold side.
Using a small screwdriver and a magnet, remove the shim.
d) Determine the size of the replacement shim using the formula: Measure the thickness of the shim that was removed.
Calculate the thickness of the new washer:
For inlet valve N=T + (A - 0.25 mm)
For exhaust valve N=T + (A - 0.45 mm),
where: T is the thickness of the previously used washer,
A - measured valve clearance,
N is the thickness of the new washer.
Select a new washer that is closest to the calculated thickness.
Reminder: Washers are available in seventeen sizes in 0.05 mm increments ranging from 2.50 mm to 3.30 mm.
e) Install a new shim on the valve lifter. Remove the special tool.
and) Recheck the clearance.
6. Reinstall the protective cover of the cylinder head (If installed).
7. Reinstall the cylinder head valve cover.