Remove the cylinder head cover.
Turning the crankshaft with a key by the head of the crankshaft pulley bolt, set the exhaust valve of the 1st cylinder to the fully open position. The crankshaft can also be turned by the front wheel. To do this, lift one side of the car with a jack until the front wheel rotates freely, install a safety stand and engage 4th or 5th gear.
Using a set of feeler gauges, check the clearances of the intake valve of the 3rd cylinder and the exhaust valve of the 4th cylinder between the ends of the adjusting screw tip and the valve stem.
If there is any deviation from the norm, adjust the clearances of these valves.
Clearances in the valve drive mechanism. The normal clearance between the end of the rocker arm adjusting screw tip and the end of the valve stem, measured with a feeler gauge on a hot engine, is 0.25 mm for intake valves and 0.30 mm for exhaust valves.
Adjust the clearances of the remaining valves by successively turning the crankshaft to the position of full opening of the exhaust valves of the 3rd, 4th and 2nd cylinders, observing the order indicated in the table.
| Fully open the exhaust valve of cylinder number | Adjust the clearance of the intake valve of cylinder number | Adjust the clearance of the exhaust valve of cylinder number |
| 1 | 3 | 4 |
| 3 | 4 | 2 |
| 4 | 2 | 1 |
| 2 | 1 | 3 |
Replace the cylinder head cover.
Adjusting the thermal clearance of the valves
(The original article is posted on: mazbook.ru)