The clearance is adjusted in the following order. Remove the spare wheel, air filter and cylinder head cover, disconnecting the crankcase ventilation hoses from it. Remove the front toothed belt cover, check and, if necessary, adjust the tension of the camshaft drive belt.
The spark plugs are unscrewed and the oil is removed from the oil baths in the cylinder head. The surface of the camshaft cams is inspected: there should be no scoring, cavities, wear or deep scratches on them. The 67.7800.9510 device is installed on the cylinder head cover mounting studs (figure 64).
Turn the crankshaft until the timing marks on the pulley and the rear cover of the timing belt are aligned (see figure 7), and then turn it by 40-50° (2.5-3 teeth on the camshaft pulley). In this case, the combustion phase will be in the first cylinder. The crankshaft should be turned only clockwise either by the generator drive pulley mounting bolt or by the camshaft pulley using the 67.7811.9513 tool. It is not allowed to turn the crankshaft by the camshaft pulley mounting bolt, as the bolt may be damaged.
Check the gaps at the first cam of the camshaft with a set of feeler gauges. If the gap differs from the norm, then use the device 67.7800. 9510 (see figure 64) the valve tappet is pressed down and fixed in the lower position by installing the retainer 2 between the edge of the tappet and the camshaft (figure 65) 67.7800.9504.
With the device 67.7800.9505 (steel plate with flat magnet) or using pliers with narrow jaws, remove the adjusting washer 1 and measure its thickness with a micrometer. Then determine the thickness of the new washer using the formula:
where H is the thickness of the new washer; B — thickness of the removed washer; A - measured gap; C — nominal clearance.
Example. Let's say A = 0.44 mm; B = 3.75 mm; C = 0.35 mm (for exhaust valve). Then W = 3.75 + (0.44—0.35) = 3.84 mm. Within the clearance tolerance of ±0.05 mm, we take the thickness of the new washer to be equal to 3.85 mm.
Install a new adjusting washer in the valve tappet, with the marking facing the tappet, remove the 67.7800.9504 retainer and check the clearance again. If it is adjusted correctly, then a 0.35 mm thick feeler gauge (for intake valves 0.2mm thick) should enter with a slight pinch. Consecutively turning the crankshaft by half a turn, which corresponds to turning the mark on the camshaft pulley by 90°, adjust the clearances at the remaining valves, observing the sequence indicated in Table 6.
The article is copied from the website: www.VazBook.ru
Note: The cam numbers are counted in order from the camshaft pulley.
After adjustment, fill the oil pans of the cylinder head and the front toothed belt cover with oil. Screw in the spark plugs, install the air filter, crankcase ventilation hoses and spare wheel.