Contents: Removal and installation the camshaft ↓ Removal and installation the…↓ Replacing the chain tensioner shoe ↓ Replacing the chain guide ↓
Removal and installation the camshaft
The operations performed to remove the camshaft are similar to those described above for removing the cylinder head (see section 1.5.2). Only here it is not necessary to drain the coolant, unscrew the spark plugs and disconnect the hoses and wires from the units installed on the cylinder head. When replacing the camshaft, the valve levers are also replaced.
Removal and installation the camshaft drive chain
To remove the chain, drain the coolant from the engine cooling system, remove the air filter and battery. Disconnect the air damper drive cable from the carburetor, and the carburetor throttle drive rods from the lever on the cylinder head cover. Remove the radiator with hoses and thermostat, remove the fan by unscrewing the mounting nuts.
Remove the cylinder head cover and turn the crankshaft until the mark on the camshaft sprocket aligns with the mark on the bearing housing (see fig. 56), and the marks on the generator drive pulley with a long mark on the camshaft drive cover (see fig. 57).
Loosen the bolt securing the camshaft sprocket. Loosen the cap nut of the chain tensioner, press the tensioner rod with a mounting blade and secure it with the cap nut. Remove the camshaft sprocket.
Loosen the generator mount and remove its drive belt. Engage the fourth gear in the gearbox, unscrew the ratchet and remove the generator drive pulley from the crankshaft. Remove the camshaft drive cover with the gasket, unscrewing the nuts securing the cover to the cylinder block and the bolts securing the oil pan to the cover. Unscrew the limiting pin 6 (see fig. 16) and remove the camshaft drive chain.
When installing the chain, first put the chain on the crankshaft sprockets and the oil pump drive shaft and tighten the limiting pin 6 of the chain. Then install the camshaft sprocket by putting the chain on it and aligning the installation marks (see fig. 56), and the sprocket mounting bolt is not tightened completely.
[The article is taken from an online resource: VAZBOOK.RU]
Loosen the chain tensioner cap nut, turn the crankshaft 2 turns and tighten the nut. Check that the timing marks match (see fig. 56 and fig. 54). If the marks do not match, then reinstall the chain, adjusting the position of the camshaft sprocket. If the marks match, finally tighten the camshaft sprocket mounting bolt and install all removed units and parts on the engine and vehicle.
After replacing the chain, check and adjust the ignition timing, the tension of the generator drive belt, as well as the air and throttle valve drives of the carburetor.
Replacing the chain tensioner shoe
To remove the shoe, perform all the above operations for removing the camshaft drive cover, but do not remove the camshaft sprocket. After removing the camshaft drive cover, unscrew the shoe mounting bolt to the cylinder block and remove the shoe.
After installing the shoe and all parts in place, check and adjust the tension of the chain and generator drive belt, the ignition timing and the air and throttle valve drives of the carburetor.
Replacing the chain guide
To remove the damper, remove the air filter and disconnect the wire from the negative terminal of the battery. Disconnect the air damper drive cable from the carburetor, and the carburetor throttle drive rods from the lever on the cylinder head cover.
Loosen the cap nut of the chain tensioner, press the tensioner rod with a mounting blade and fix it with the cap nut. Unscrew the bolts securing the chain damper to the cylinder head and remove it.
After installing the new chain guide in place, adjust the chain tension, install the removed parts in place, and adjust the air and throttle valve drive of the carburetor.