Citroen Xantia

since 1993 of release

Repair and car operation

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Belt of a drive of GRM - the general information, removal, check of a condition and installation

General information

By means of a gas-distributing belt the drive of a camshaft, TNVD and the water pump is carried out. Rotation is transferred through cogwheels from the forward end of a cranked shaft. Remember that break or a proskalzyvaniye of a gas-distributing belt at the working engine leads to serious damages of a head of cylinders as a result of blow of plates of valves about the bottoms of pistons.

Replacement of a gas-distributing belt should be made strictly according to the schedule of routine maintenance of the car (address to Head Routine maintenance). Extraordinary replacement of a belt should be made in case of pollution by its oil, and also at emergence of the scraping sounds testifying to non-uniform wear of a tape or teeths.

At the same time with change of a belt it is necessary to check the water pump on existence of signs of leaks.

Removal

Removal of a belt of a drive of GRM


8 — the Square opening 9 — 11 — Bolts	12 — the Axial nut of a natyazhitel 13 — the Adjusting bolt

PERFORMANCE ORDER

1. Achieve combination of openings for blocking cranked/distributive in bulk and TNVD, pass in openings metal cores of the corresponding diameter (see. Fixing cranked / distributive shaft and TNVD for the purpose of prevention of casual hit of valves in contact to pistons in the course of performance of procedures of service of the car). At all do not allow attempts of a provorachivaniye of the engine after introduction of blocking cores.
2. Remove covers of a gas-distributing belt (see. Removal and installation of covers of a gas-distributing belt).
3. Remove a spherical receiver from the main hydraulic accumulator (see. Head Uniform hydraulic system) and отболтите bottom cover of transmission. Ask the assistant to block a starter gear wheel a screw-driver with a wide sting, then turn out a bolt of a pulley of a cranked shaft. Remove a pulley.
4. Remove a metal plate and an arm of the right support of the power unit (see. Removal and installation of components of the right support of the power unit and a natyazhitel of a gas-distributing belt), then weaken an axial nut and an adjusting bolt of a natyazhitel of a gas-distributing belt. For weakening of a belt develop an arm of a natyazhitel counter-clockwise. Again tighten an adjusting bolt, having fixed a natyazhitel in this situation. In case of need pass a 10-millimetric drive of a face key in the opening of square section provided in an arm for the purpose of simplification of overcoming of resistance of a spring (see an illustration Removal of a belt of a drive of GRM).

5. Mark with an arrow the initial direction of rotation of a belt and remove the last from the engine.

Condition check

Attentively examine a belt on existence of stratifications, signs of non-uniform wear and traces of pollution by oil. It is necessary to give special attention to a condition of roots of teeths. The defective belt is subject to replacement. If the engine needs carrying out major maintenance, or to its test with this belt makes more than 60 000 km (36 000 miles), the belt also is subject to replacement regardless of its condition. Remember that cost of a new belt is incommensurably small in comparison with costs of engine repair in case of its exit out of operation as a result of belt break during movement. In case of identification of traces of a zamaslivaniye without fail find out a source of leak and eliminate its reason. Carefully wipe a surface of the engine and accompanying components around belt installation, having completely removed about a bottom oil traces. Check freedom of rotation of a roller of a natyazhitel, in case of need make his replacement (see. Removal and installation of components of the right support of the power unit and natyazhitel of a gas-distributing belt and Removal and installation of an intermediate roller of a gas-distributing belt).

Installation

PERFORMANCE ORDER

1. Make sure of presence on the place of 8-millimetric bolts blocking cogwheels of a camshaft and TNVD, and also a core blocking a flywheel (see. Fixing cranked / distributive shaft and TNVD for the purpose of prevention of casual hit of valves in contact to pistons in the course of performance of procedures of service of the car). 2. Put on a gas-distributing belt a cogwheel of a cranked shaft, having tracked observance of the initial direction of its rotation. 3. Fix a belt on a wheel of a cranked shaft and accurately put on it the remained gear wheels/rollers in the following order (see an illustration Removal of a belt of a drive of GRM): a) Intermediate roller; b) TNVD cogwheel; c) Camshaft cogwheel; d) Roller of a natyazhitel; e) Cogwheel of the water pump.
4. Try not to overwind and not to bend excessively at installation a belt. For a guarantee of correctness of landing of a belt plant it at first on a half of width of a cogwheel of TNVD, then get on a camshaft wheel, watching correctness of gearing of teeths on a wheel of a cranked shaft and without weakening a tape tightness. Having achieved desirable result, finally plant a belt on all wheels.
5. Turn out fixing a camshaft and TNVD bolts, take a core of blocking of a flywheel (see. Fixing cranked / distributive shaft and TNVD for the purpose of prevention of casual hit of valves in contact to pistons in the course of performance of procedures of service of the car). 6. At the released axial nut, manually holding an arm of a natyazhitel, weaken an adjusting bolt. Slowly release an arm so that the roller nestled on an internal surface of a tape of a belt. Tighten an adjusting bolt and an axial nut. 7. Turn a cranked shaft on two complete revolutions in the normal direction (clockwise). Provorachivaniye of a shaft it is in the opposite direction inadmissible, as the belt should remain tense on sites between cogwheels of a cranked shaft, TNVD and a camshaft. 8. Weaken adjusting and an axial nut a bolt of a natyazhitel, having allowed a spring to press densely a roller to a belt tape, then tighten a bolt and a nut with demanded effort. 9. Make sure of correctness of combination of blocking openings by a prodevaniye of cores of the corresponding diameter in them (see. Fixing cranked / distributive shaft and TNVD for the purpose of prevention of casual hit of valves in contact to pistons in the course of performance of procedures of service of the car). If to enter cores it is not possible, therefore the belt is established incorrectly and all procedure is necessary for repeating. 10. Further assembly is made as it should be, the return to an order of dismantle of components.