Toothed belt

Withdrawal

Remove the ground wire from the battery. Loosen the lower mounting bolts, unscrew the upper tension bolt of the generator. Tilt the alternator towards the engine and remove the drive belt. Unscrew bolts of fastening of a cover of a gear belt and remove it.

The timing belt cover consists of two parts, each with its own rubber seal. On the bottom cover there is a mark for setting the first cylinder to TDC. The bottom cover can only be removed after the auxiliary drive belt pulley has been removed from the crankshaft.

Turn the crankshaft of the engine until the marks on the camshaft pulley and cylinder head, as well as on the crankshaft pulley and the oil pump housing, are aligned.

Lock the engine crankshaft. To do this, remove the starter and fix the flywheel ring gear. Unscrew the mounting bolt and remove the crankshaft pulley.

Loosen the two bolts securing the toothed belt tension roller and use a screwdriver to move the tension roller away from the belt, compressing the spring, and then tighten the bolts (see fig. 2B.12).



To reinstall the toothed belt, note the direction of its movement.


Remove toothed belt (see fig. 2B.13).



Attention After removing the belt, it is strictly forbidden to turn the pulleys of the crankshaft and camshafts, as the pistons may collide with the open valves, which will lead to serious engine damage.

Installation and adjustment

Install the belt on the crankshaft pulley, pull it vertically and install it sequentially on the camshaft pulley, idler pulley and water pump pulley. Check the alignment of the marks on the pulleys, which should not change (see fig. 2B.14).



Loosen the toothed belt tensioner bolts. Under the action of the spring, the toothed belt will be tensioned, and then tighten the bolts. If the belt tensioner does not contain a spring, tension it. by turning the tension roller and tightening the bolts Install the V-belt pulley on the crankshaft and secure it with the bolt.


Turn the crankshaft two turns clockwise and check the alignment of the marks on the camshaft pulley and the cylinder head.

Rotate the crankshaft 60°counterclockwise, which moves the camshaft sprocket by three teeth, and check the belt tension by pushing the long section of the belt towards the water pump pulley and measure the distance between the outside diameter of this sprocket and the top of the belt tooth on a long branch. The value of this distance should be within 4-6 mm. If this condition is not met, re-adjust the toothed belt tension.

When using a special belt tension gauge, install it on a long branch of the belt, and the gauge tensioner should enter the recess between the teeth. The meter should show a value of 4 to 6 on a used belt and 10-12 on a new belt.

Attention. To adjust the toothed belt tension only on a cold engine.

Install the toothed belt cover. Install the alternator auxiliary V-belt and adjust its tension. Install starter.