The toothed belt is made of polymer reinforced with a steel wire frame. This belt does not require any lubrication or tightening.
Replacing a timing belt is an extremely labor-intensive operation. It requires a number of special tools (tDC setting device, marking pin or marking plates, two-hole nut wrench, setting ruler, support device with legs or lifting device, protractor circle, counter support, etc.,). If an error is made during adjustment, it can lead to serious damage to the engine.
Replacing the belt is also a very complicated task because handling the damped tensioning elements, dismantling and installing the tensioning element of the poly V-belt, and dismantling and installing the belt cover require the appropriate knowledge and experience. In addition, the valve timing must be readjusted during installation. For this reason, we do not stop at dismantling and installing the toothed belt; in fact, we strongly recommend that you visit a workshop to replace the belt.
Toothed belt drive in the 1.6 l ALZ engine: 1 - rotary bolt, 2 - toothed belt cover - upper part, 3 - central screw (loosen and tighten with counter support 3415, tightening torque 100 Nm), 4 - camshaft gear, 5 - screw and washer combination (10 Nm), 6 - timing belt cover - rear section, 7 - hexagon socket head cap screw (10 Nm), 8 - O-ring, 9 - coolant pump, 10 - timing belt, 11 - crankshaft gear, 12 - screw (90 Nm, then tighten another 90°), 13 - timing belt cover - lower section, 14 - screws (10 Nm), 15 - vibration damper (pulley), 16 - screw (25 Nm), 17 - timing belt cover - middle section, 18 - tension roller, 19 - washer, 20 - nuts (20 Nm).
Toothed belt drive in ALT and AVJ engines: 1 - toothed belt cover - lower part, 2 - screws (10 Nm), 3 - toothed belt cover - middle part, 4 - toothed belt cover - upper part (carefully attach to the middle part of the cover; position 4 in AVJ engines is made slightly differently than in ALT engines), 5 - screws, 6 - toothed belt, 7 - guide roller, 8 - nut (27 Nm), 9 - central screw (loosen and tighten with counter support 3036, tightening torque 65 Nm), 10 - camshaft gear, 11 - tension roller, 12 - washer, 13 - timing belt tensioner, 14 - O-ring, 15 - coolant pump, 16 - screw (15 Nm), 17 - crankshaft gear, 18 - screw (loosen and tighten with counter support 3415, tightening torque 90 Nm, then tighten another 90°; replace screw, do not lubricate), 19 - screw (15 Nm), 20 - screw (25 Nm).
Toothed belt drive in 6-cylinder ASN engines: 1,3, 8 and 30 - screws (self-locking, 45 Nm), 2 and 6 - washer, 4 - tension roller, 5 - tension lever, 7 - toothed belt, 9 - toothed wheel of the exhaust camshaft (right bank of cylinders), 10 - intake camshaft gear (right bank of cylinders), 11, 13, 16, 17, 22 and 34 - screws (some self-locking, 10 Nm), 12 - holding the guide roller gel, 14 - toothed belt cover - rear right side, 15 - guide roller, 18 - mechanical pump of the cooling system, 19 - sealing gasket, 20 - toothed wheel of the intake camshaft (left bank of cylinders), 23 - exhaust camshaft gear (left bank of cylinders), 24 - screw (100 Nm), 25 - O-ring, 26 - cover, 27 - retaining ring, 28 - diamond washer, 29 - eccentric roller, 31 - crankshaft gear, 32 - central screw (200 Nm, then tighten another half turn), 33 - tensioner for toothed belt.
If you decide to work with a toothed belt, do not bend it longitudinally under any circumstances. If the belt has been bent even once, it must be replaced. During operation, such a belt can break, and this leads to serious damage to the engine.
It is also important that when the camshaft rotates with the timing belt removed, not a single piston is at TDC, otherwise serious damage to the pistons or valves may occur.