General information
The primary function of the timing belt is to drive the camshaft from the crankshaft. In parallel, the belt is also used to drive the high-pressure fuel pump and the intermediate shaft of the engine. Slipping or breaking of the timing belt when the engine is running can lead to serious internal damage to the cylinder head due to contact between the valves and the piston crowns.
In view of the above, it is extremely important to regularly check the correct adjustment of the belt tension and its general condition. These checks can only be performed after dismantling the belt covers.
Removing the rear (internal) section of the timing belt cover is included in the camshaft seal replacement procedure (see section Replacing the camshaft seal).
Removal
1. Before starting the procedure, the engine and the car should be immobilized:
- a) Disconnect the negative battery cable.
- b) Support the rear wheels of the car with wedges and apply the parking brake. Move the manual transmission control lever to neutral position.
2. To provide better access to the outer covers, remove the air cleaner from the mudguard and also disconnect the air cleaner from the intake manifold cover (see Chapter Power supply system).
3. Raise the engine using a winch or support it with a hydraulic jack (to distribute the load, a wooden block should be placed between the jack head and the oil pan).
4. In several steps, loosen and unscrew the mounting bolts and remove the right and rear powertrain mounts from the vehicle (see section Powertrain Mounts - Checking and Replacing). Also unbolt the lower part of the right support from the cylinder head.
5. Bring the engine to the TDC position of the end of the compression stroke of the piston of the first cylinder (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke).
6. Remove the accessory drive belt (see section Removal, installation and adjusting the tension of the auxiliary drive belt).
7. Lower the engine slightly to allow clearance for removal of the accessory drive belt pulleys.
8. Remove the mounting bolts and remove the water pump and crankshaft pulleys from the engine.
Note: To ensure that the pulley is securely locked, engage high gear while loosening its mounting bolts (don't forget to switch back to neutral after removing the pulley) and have an assistant firmly press the foot brake pedal. You can also use a rubber cord/old drive belt, wrapping it tightly around the pulley.
9. Remove the auxiliary drive belt tensioner roller mounting bolt (the bolt has a left-hand thread!). Remove the video.
10. Release the metal wire clips.
and unscrew the bolt securing the upper timing belt cover.
11. Release the fuel pipes from the retainer on the cover and move them to the side. Remove the upper belt cover from the engine.
12. Remove the bolts, release the clamps and remove the lower belt cover.
13. Check the reliability of the fit of the locking pin of the fuel injection pump gear (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke), then loosen the three outer wheel bolts by half a turn.
Information copied from the resource www.SKODABOOK.ru
Note: Do not loosen the center wheel nut as this will cause the fuel injection pump to lose its basic settings.
14. Loosen the timing belt tension by slightly loosening the tensioner mounting nut.
15. Check the belt for factory indications of rotation direction. If necessary, apply the appropriate marking yourself (if of course the belt is in satisfactory condition and can be used further).
16. Taking care not to bend or twist it excessively, remove the belt from the gear wheels.
17. Check the belt for traces of coolant or oil contamination. If any are found, try to immediately identify the source of the leak and eliminate its cause. Particular attention should be paid to the condition of the leading edges of the teeth on the working side of the belt. A worn, contaminated or defective belt must be replaced.
Note: Every 50,000 km (30,000 miles) the belt should be changed regardless of its condition.
18. If the belt is not immediately reinstalled, a warning sign should be attached to the engine to prevent accidental rotation of the shafts. As a guarantee, the ignition switch can be sealed just in case.
Installation
1. Make sure that the crankshaft is in the TDC position of the end of the compression stroke of the piston of the first cylinder (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke).
2. Loosen the camshaft gear bolt by half a turn. Carefully tap the drift inserted into the specially provided hole in the inner belt cover to loosen the seat of the gear on the conical support of the camshaft.
3. Observing the direction of rotation required by the marking, freely move the timing belt over the crankshaft gear.
4. Engage the belt with the crankshaft gear teeth, then place it on the camshaft and fuel injection pump gears. Make sure the belt is seated correctly on the gears.
Note: It is possible that in order to achieve adequate belt fit, it will be necessary to slightly adjust the position of the camshaft gears and the fuel injection pump.
5. Without allowing it to twist, place the smooth side of the belt under the rollers of the intermediate shaft and tensioner.
6. Make sure that the front part of the belt is tight and that all the slack is in the area that is tucked under the tensioner roller.
7. Tighten the belt by turning the tensioner equipped with an eccentric support clockwise - the tensioner hub has two holes specifically for this purpose, into which the ends of pliers for removing/installing snap rings can be inserted, which are an excellent equivalent of the special Skoda tool.
...continue to rotate the tensioner until the notch and protrusion fit together. Once the adjustment is complete, tighten the lock nut to the required torque.
8. Now make sure once again that the crankshaft is still in the TDC position at the end of the compression stroke of the piston of the first cylinder (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke).
9. Tighten the camshaft timing gear bolt to the required torque (see section Removal and installation the tensioner and timing belt gears).
10. Tighten the three outer bolts of the injection pump gear, then remove the locking pin.
11. Remove the camshaft lock (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke).
12. Using a socket wrench, turn the crankshaft two full turns by the gear bolt, again stopping it in the TDC position of the end of the compression stroke of the piston of the first cylinder. Make sure that it is possible to insert the locking pin into the gear of the fuel injection pump (see section Bringing the piston of the first cylinder to the top dead center (TDC) position at the end of the compression stroke). Make sure that the timing belt tension is correct and repeat the adjustment if necessary.
13. Check the proper functioning of the tensioner (see section Removal and installation the tensioner and timing belt gears).
14. Reinstall the lower and upper sections of the outer timing belt cover. Snap the clips into place and tighten the mounting bolts securely.
15. Install the accessory drive belt tensioner roller in place and tighten its mounting bolt (with left-hand thread!) with the required effort.
16. Install the water pump pulley and tighten the mounting bolts to the required torque.
17. Install the auxiliary belt pulley onto the crankshaft toothed wheel, then, proceeding as when removing, tighten its mounting bolts to the required force.
Note: The asymmetrical arrangement of the mounting holes ensures that the pulley is installed unambiguously.
18. Reinstall the accessory drive belt and adjust its tension (see section Removal, installation and adjusting the tension of the auxiliary drive belt).
19. Raise the engine to allow connection of the right and rear powertrain suspension supports.
20. Install the supports in place and tighten their mounting bolts to the required torque. Finally, disconnect the lifting rigging/remove the jack from under the engine.
21. Connect the air intake hose to the intake manifold cover and wheel arch splash guard.
22. Connect the negative cable to the battery.
23. Finally, check the correctness of the basic settings of the fuel injection pump (see Chapter Power supply system).