- a) Disconnect the negative cable from the battery;
- b) Chock the rear wheels, apply the parking brake and move the manual transmission control lever to neutral.
Tensioner
Removing
1. Bring the piston of the first cylinder to the TDC position of the end of the compression stroke (see Section Bringing the piston of the first cylinder to the top dead center position (TDC) end of compression stroke) and remove the upper and lower sections of the outer cover of the timing belt (see Section Removal and installation of the timing belt and its covers).
![](https://www.skodabook.ru/img/remain/1124.jpg)
2. After loosening the tensioner pulley hub nut, loosen the timing belt. Loosen the nut...
![](https://www.skodabook.ru/img/remain/1125.jpg)
and remove the tensioner from the stud.
Examination
Without using any solvents, thoroughly wipe the tensioner assembly. Turning by hand, evaluate the freedom of rotation of the tensioner roller. Pay attention to the presence of jerks and jamming points. A worn out tensioner cannot be repaired and must be replaced.
Installation and function check
1. Slide the roller onto the stud, then screw on the mounting nut.
2. Install the timing belt and adjust its tension (see Section Removal and installation of the timing belt and its covers).
![](https://www.skodabook.ru/img/remain/1126.jpg)
3. In order to check the correct functioning of the tensioner, press your finger on the belt in the area in the middle between the gears of the camshaft and the injection pump - the alignment of the alignment marks of the roller will be violated. After releasing the belt, the marks should return to their original position, aligned with each other.
4. If there are signs of jamming, replace the tensioner.
5. Reinstall the timing belt covers, auxiliary drive belt pulleys, engine mounts, and any other components removed for access. Connect the negative wire to the battery.
Camshaft gear
Removing
1. Bring the engine to TDC (see Section Bringing the piston of the first cylinder to the top dead center position (TDC) end of compression stroke), then remove the timing belt covers (see Section Removal and installation of the timing belt and its covers). After releasing the central nut of the tensioner, loosen the belt and remove it from the camshaft gear.
![](https://www.skodabook.ru/img/remain/1127.jpg)
2. With the help of a fork blocker, fix the camshaft gear from turning, getting ready to release the bolt of its fastening.
3. Turn out a bolt of fastening of a cogwheel.
Warning! Due to the potential for damage to the internal components of the head if the camshaft is accidentally rotated with the timing belt removed, take appropriate precautions. The compilers of this manual recommend taking the crankshaft a few degrees back from the TDC position. Be sure to return the shaft to its original position before installing the belt.
4. Remove the gear wheel from the camshaft stub.
5. Check up a condition of an epiploon of a camshaft. If there are signs of leaks, replace (see Section Camshaft oil seal replacement).
6. Thoroughly wipe the mating surfaces of the gear and shaft journal.
Installation
1. Install the gear wheel on the shaft journal, taking care to align the seat lug with the keyway.
2. Make sure that the crankshaft is set to the TDC position of the end of the compression stroke of the first cylinder (see Section Bringing the piston of the first cylinder to the top dead center position (TDC) end of compression stroke), then install the timing belt and adjust its tension (see Section Removal and installation of the timing belt and its covers).
3. Reinstall all parts removed for access, adjust the accessory drive belt tension, and reconnect the negative cable to the battery.
Crankshaft gear
Removing
1. Bring the engine to TDC (see Section Bringing the piston of the first cylinder to the top dead center position (TDC) end of compression stroke), then remove the timing belt covers (see Section Removal and installation of the timing belt and its covers). After releasing the central nut of the tensioner, loosen the belt and remove it from the camshaft gear.
2. Have an assistant jam the flywheel ring gear through the starter mounting hole, thereby blocking the crankshaft from turning. Release a bolt of fastening of a cogwheel. The description of procedures of removal and installation of a starter is resulted in the Chapter Engine electrical equipment.
3. Turn out a bolt and remove a cogwheel.
4. Check up a condition of an epiploon of a cranked shaft. If leaks are found, replace (see Section Replacing the crankshaft seals).
5. Thoroughly wipe the mating surfaces of the gear and shaft journal.
Installation
![](https://www.skodabook.ru/img/remain/1128.jpg)
1. Slide the gear wheel onto the shaft journal, making sure that the seating lug is aligned with the keyway. Lubricate the mounting bolt with oil, screw it in and tighten it to the required torque.
Attention! The final tightening of the bolt in order to avoid damage to the cylinder head if the shaft is accidentally rotated, it is better to postpone until the timing belt is installed.
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2. 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 position (TDC) end of compression stroke), then install the timing belt and adjust its tension (see Section Removal and installation of the timing belt and its covers).
3. Install the removed parts in reverse order.
Intermediate shaft gear
Removing
1. Bring the engine to TDC (see Section Description of the main components and mechanisms), then remove the timing belt covers (see Section Removal and installation of the timing belt and its covers). After releasing the central nut of the tensioner, loosen the belt and remove it from the camshaft gear.
2. Using a fork lock, block the countershaft gear.
![](https://www.skodabook.ru/img/remain/1131.jpg)
3. Turn out a fixing bolt and remove a cogwheel. If equipped, remove the key.
4. Check the condition of the shaft seal, if necessary, replace it (see Section Replacing the intermediate shaft seal).
5. Thoroughly wipe the mating surfaces of the gear and shaft journal.
Installation
1. If equipped, replace the key (flat side up). Put the gear wheel on the shaft journal, making sure that the reciprocal groove is aligned with the key.
2. Block the gear wheel from turning and tighten the mounting bolt to the required force.
3. 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 position (TDC) end of compression stroke), then install the timing belt and adjust its tension (see Section Removal and installation of the timing belt and its covers).
4. Replace all components removed for access. Adjust the tension of the auxiliary drive belt and connect the negative cable to the battery.
Fuel pump sprocket
see chapter Supply system.