Mercedes C-Class

W203 since 2000 of release

Repair and car operation



Mercedes-Benz
+ Mercedes-Benz Cars of a class C (W-203)
+ Operation manual
+ Routine maintenance
- Engine
   Compression check in engine cylinders
   Engine check by means of the vacuum gage
   Removal and installation of a cover of an impellent compartment from the bottom
   - 4-cylinder petrol engines
      Removal and installation of a head of cylinders
      Removal and installation of a cover of a head of cylinders
      Removal and installation of a natyazhitel of a chain
      Replacement of chains of a drive of GRM and installation of phases of a gazoraspredeleniye
      Check of phase installation of camshafts
      Removal and installation of a maple belt
   + 6-cylinder petrol engines
   + Diesel engines
   + System of greasing of the engine
+ cooling and heating Systems
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment







Removal and installation of a head of cylinders

Engine 111

As the specified work demands existence of a certain experience, the description of only basic provisions necessary for work of the skilled mechanic is provided.


Removal

 PERFORMANCE ORDER

1. Remove the air filter (2), depending on engine model, together with executive body for a circulating zaslonka.
2. Remove the top cover of the engine (7/11).
3. Uncover heads of cylinders, address to appropriate section.
4. Remove an air inlet.
5. Models with AT: Disconnect the vacuum pipeline at the electric vacuum pump. Thus compress both brackets of the lock and extend the pipeline. Disconnect taking-away pipe from the vacuum pipeline.
6. Remove a collar of the pipeline of a retsirkulyatsiya of the fulfilled gases from the holder. Remove switching valve from the holder. Thus disconnect from the gate two vacuum lines. Then disconnect the holder from the inlet pipeline.
7. Models with AT: Remove directing pipe of the index of level of oil of a transmission about an eye.
8. Remove the fuel distributive highway with injectors.
9. Unscrew bolts of fastening and remove the inlet pipeline from a head of cylinders. Disconnect a vacuum hose of the valve of a retsirkulyatsiya. Take away the inlet pipeline from a head of cylinders and fix it with the attached wires in an impellent compartment.
10. Remove a ventilating pipe of removal of karterny gases from a head of cylinders.

11. Disconnect ventilating hoses of the engine (1) under flange connection of the inlet pipeline and a head of cylinders.

12. Remove maple a belt of a drive of the compressor, address to appropriate section.
13. Remove soaking-up and forcing branch pipes of the compressor.
14. Remove the compressor.
15. Lift and establish the car on supports. Remove facing of an impellent compartment from below.
16. Merge cooling liquid, address to the Section Replacement of cooling liquid - general comments.
17. Disconnect a reception pipe of system of production of the fulfilled gases from a final collector. Disconnect the holder of a pipe at a transmission. Lower system of release a little and fix it a wire or a cable connector.
18. Remove a pipe of a retsirkulyatsiya of the fulfilled gases from the block of cylinders. Remove holders of a pipe of a retsirkulyatsiya on the right and at the left behind a head of cylinders.
19. Remove a hose of cooling liquid of a heater. For this purpose wring out a bracket so that it was fixed. After that take out the pipeline of cooling liquid.
20. Establish the piston of the first cylinder in situation 20 ° after VMT. For this purpose turn a cranked shaft for a pulley in the direction of rotation of the engine so that the mark 20 ° on a pulley coincided with a mark in a cover of a casing of the mechanism of distribution. In this situation cams of the first cylinder of a camshaft of inlet valves and a camshaft of final valves should stand at an angle up.
21. Remove the thermostat case, address to the Section Removal and thermostat installation.

22. Remove a forward cover (3). For this purpose turn out 2 bolts of fastening (1) from both parties of a forward cover (3). Bolts have diameter of a carving of 8 mm, besides behind a cover there are directing plugs. Turn out bolts (2) (diameter of a carving of 6 mm) and uncover (3). Pay attention to existence of an interfaced ring between a cover and a head of cylinders. Clear interfaced surfaces.

23. Mark with paint of a gear wheel of camshafts in relation to a chain.
24. Remove a natyazhitel of a chain, address to appropriate section.

25. Remove top directing slidings. For this purpose pull out for a carving a finger directing (1) by means of the shock adaptation for an extract (2) or any other suitable tool. For this purpose provide cargo sliding the adaptation in relation to an emphasis.

26. Remove a gear wheel of a camshaft of final valves. When unscrewing bolts hold a camshaft from a provorachivaniye for a shestigrannik.
27. Unscrew bolts of fastening of a cover of the bearing of a camshaft of inlet valves. Bolts turn on in stages. Put bolts so that it was possible to establish them on former places.
28. Remove from an asterisk a chain of a drive of a camshaft of inlet valves.
29. Take out a camshaft of inlet valves.
30. Take out a finger of the left directing.
31. Unscrew bolts of fastening and uncover a casing of the mechanism of a gazoraspredeleniye a head of cylinders.
32. Weaken bolts of fastening of a cover of a head of cylinders on the cold engine in sequence, return to their fixing, then turn out bolts.

33. Measure length of bolts М12 of fastening of a head of cylinders. The length of new bolts makes L = 102 mm. After each inhaling the length of bolts increases. At length of 106 mm and more it is necessary to replace bolts. It is thus recommended to apply only new bolts.

34. By means of the assistant remove a head of cylinders.


Installation

 PERFORMANCE ORDER

Installation is carried out in sequence, return to removal. Thus it is necessary to observe the following:

1. Clear the contact plane a head of cylinders and the block of cylinders and check existence of cracks and roughnesses. Clear carving openings.
2. Establish into place new sealing laying.

3. Establish a head of cylinders so that directing plugs in the block of cylinders entered into openings in a head of cylinders. At installation of a head of cylinders watch the provision of the directing.

The inhaling of bolts of fastening of a head of cylinders should be carried out with special care. Before an inhaling it is necessary to check accuracy of a dinamometrichesky key. On the set corner it is possible to apply an angular washer to simplification of an inhaling of bolts, for example, HAZET 6690. Not to load a dinamometrichesky key with the big moment, the angular washer should be applied together with a rigid key.


If the angular washer available is not present, make an assessment of an angle of rotation of a key. For this purpose put a rigid key so that the handle of a key stood along the engine, and turn a key for once so that the handle became perpendicularly to the engine.

Specifications of a head of cylinders are provided in Specifications.

4. Oil a carving and a basic surface of heads of bolts of fastening of a head of cylinders and tighten in the established sequence with 1 on 10 at first to a prileganiye to a head of cylinders, and then the moments specified in Specifications:

5. Slightly oil basic surfaces of heads of new bolts of fastening (And) a head of cylinders to a cover of the case of the mechanism of a gazoraspredeleniye and screw bolts. Tighten bolts the specified moment.
6. Grease with Omnifit FD 3041 hermetic before installation a finger directing. Fix directing from above the moment 10Нм.
7. Establish a camshaft of inlet valves. Grease compensating elements and installation sites of bearings. Lay a shaft so that cams of the first cylinder stood at an angle up.

At long operation of the engine check axial люфт a camshaft in the adjusting bearing. Check люфт camshafts, if necessary adjust.

8. Establish a camshaft of inlet valves on a former place and evenly tighten fastening bolts (danger of damage of a shaft). Bearings of a camshaft have numbering with 1 on 10, since the party of a camshaft of inlet valves. Fix a cover of bearings in stages with a step in one turn, finally tighten the moment 21Нм.
9. Tighten bolts of fastening of a gear wheel of a camshaft of final valves new bolts the moment 20Нм. Then tighten bolts on a corner 60 °.
10. Grease interfaced surfaces of a forward cover (3) on a head of cylinders with hermetic, for example, «Omnifit FD 3041».
11. Insert behind a cover directing plugs for two bolts (1) (diameter of a carving of 8 mm). Establish a new sealing ring for cooling liquid and put into place a cover.
12. Tighten bolts (1) from both parties the moment 25Нм, bolts (2) (diameter of a carving of 6 mm) the moment 10Нм.
13. Check before installation existence of damages of a hose of cooling liquid of a heater, if necessary replace hoses. Replace a sealing ring on a supply of cooling liquid.
14. Fix a pipe of system of a retsirkulyatsiya of the fulfilled gases with new sealing rings on the block of cylinders.
15. Fix a reception pipe of system of release on a final collector new bolts the moment 20Нм.

Replace zaklyopochny nuts in a collector. For this purpose screw an auxiliary bolt by hand in a zaklyopochny nut and in blows on a head of a bolt beat out a zaklyopochny nut. Involve a new zaklyopochny nut with a bolt under a raschekanka and tighten the moment 30Нм.

16. Fix the holder of a reception pipe on a transmission the moment 20Нм.

17. Fix the inlet pipeline (2) with new sealing laying (1) on a head of cylinders the moment 20Нм.

Previously clear interfaced surfaces.

18. Establish into place an air inlet, having checked a sealing ring. If necessary, replace a ring.