Removing
1. Remove the camshaft gear (see Removal and installation of the belt tensioner and timing gears (engines 1.7 l). Remove the timing cover (see Removal and installation of a cover of the gas-distributing mechanism). Turn out two bolts of fastening of a back cover of a gas-distributing belt to the case of the gas-distributing mechanism.
![](https://www.opelbook.ru/img/astra/3639.jpg)
2. Remove fuel injectors (see chapter Power and exhaust systems).
3. Turn out bolts of fastening of an air sleeve of a turbocharger and remove an arm from the left back part of the case of the gas-distributing mechanism and the inlet pipeline. Release the clips and separate the sleeve from the intake duct.
![](https://www.opelbook.ru/img/astra/3640.jpg)
4. Turn out bolts of fastening of a tube of system recirculation of the fulfilled gases (EGR) to the exhaust manifold - do not forget about the gasket.
![](https://www.opelbook.ru/img/astra/3641.jpg)
5. Release a big union socket, disconnect a tube from the EGR valve and remove it from the engine. Now you can remove the left rear lifting eye of the power unit from the gas distribution mechanism housing.
![](https://www.opelbook.ru/img/astra/3642.jpg)
6. Disconnect the fuel return hose from the tube. Disconnect the heater wiring connectors.
![](https://www.opelbook.ru/img/astra/3643.jpg)
7. Release the refrigerant lines of the air conditioning system from the retainers on the right mudguard. Disconnect the electrical wiring and remove the three bolts securing the air conditioning compressor to the support bracket. Separate the compressor from the engine and tie it aside to the bulkhead panel.
![](https://www.opelbook.ru/img/astra/3644.jpg)
8. Turn out three fixing bolts and remove a basic arm of the compressor.
![](https://www.opelbook.ru/img/astra/3645.jpg)
9. Acting in a strictly defined sequence, gradually, half a turn per approach, loosen the bolts securing the gas distribution mechanism housing.
![](https://www.opelbook.ru/img/astra/3646.jpg)
10. Turn out fixing bolts and remove the case of the gas-distributing mechanism and its sealing lining.
![](https://www.opelbook.ru/img/astra/3647.jpg)
Installation
1. Make sure that the mating surfaces of the body and cylinder head are absolutely clean and dry - all the smallest traces of the old gasket material must be removed from the surfaces.
2. Before installing the timing housing, make sure that the camshaft gear marks are aligned correctly.
![](https://www.opelbook.ru/img/astra/3648.jpg)
3. Place a new gasket on the mating surface of the cylinder head. Press the body of the gas distribution mechanism against the head, screw in the fixing bolts and, acting in a strictly defined order, evenly tighten them in several stages with the required force.
![](https://www.opelbook.ru/img/astra/3649.jpg)
4. Further installation is carried out in the reverse order to the dismantling of components. Pay attention to the following points:
5. Check valve clearances, correct if necessary (see Checking and adjusting valve clearances (1.7L DOHC engines).
6. Adjust timing belt tension (see Removing and installing timing belt).
7. Check the connection of the hose and fuel return tube for signs of leak development.
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