S-class W202 Mercedes

1993-2000 of release

Repair and car operation



W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
- 3. Engines
   3.1.2. Identification number
   + 3.1.3. Engine
   3.1.4. Cars with the conditioner
   3.1.5. Bottom cover of a motor compartment
   3.1.6. Covers of cast openings
   3.1.7. Natyazhitel of a chain
   + 3.1.8. Cover of a head of the block of cylinders
   + 3.1.9. Head of the block of cylinders
   + 3.1.10. Camshafts
   3.1.11. Hydraulic tarelchaty pushers
   3.1.12. Maslootrazhatelnye caps
   3.1.13. Valves
   3.1.14. Directing valves
   3.1.15. Saddles of valves in a head of the block of cylinders
   3.1.16. Compression
   + 3.1.17. Klinovy belt
   3.1.18. Diagnostics of malfunctions (DB)
   3.1.19. General comments
   3.1.20. Repair work without engine dismantle
   + 3.1.21. Major maintenance of the engine
   + 3.2. Diesel engine (DD)
   3.2.3. Cars with the conditioner
   3.2.4. Bottom cover of a motor compartment
   3.2.5. Covers of cast openings
   3.2.6. Natyazhitel of a chain
   + 3.2.7. Camshaft
   + 3.2.8. Head of the block of cylinders
   + 3.2.9. Maslootrazhatelnye caps
   3.2.10. Cover of a head of the block of cylinders (2,2/2,5 l)
   3.2.11. Hydraulic tarelchaty pushers
   3.2.12. Valves
   3.2.13. Directing valves
   3.2.14. Saddles of valves in a head of the block of cylinders
   3.2.15. Head of the block of cylinders and motor block
   3.2.16. Compression
   3.2.17. Maple ridge belt
   3.2.18. Tense device of a maple ridge belt
   3.2.19. Diagnostics of malfunctions (DD)
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes








b47c026d b47c026d


3.2.15. Head of the block of cylinders and motor block

PERFORMANCE ORDER
1. Remove a head of the block of cylinders.
2. Check a head of the block of cylinders / the motor block on a deflection at length and width by means of a ruler and a set of templates. On all length the deflection should not exceed 0,08 mm. On all width of a deflection should not be.

3. Check planeness of a head of the block of cylinders also on the top sealing surface to a cover of a head of the block of cylinders. The tolerance should make no more than 0,1 mm.
Prevention

If on a partition between the entrance and target valve lungs of scratches are found, in replacement of a head of the block of cylinders there is no need. If the surface of a head of the block of cylinders, especially a surface of division of chambers of combustion, rough, deformed or has small damages of type рисок, scratches etc., – that the damaged surfaces grind. It does not belong to a sealing surface of a cover of a head of the block of cylinders.


4. Engine in volume of 2,0 l: the general height of a head of the block of cylinders makes N = 142,9–143,1 mm.
After grinding the height of a head of the block of cylinders should be not less than A N = 142,2 mm.
The height of microroughnesses of a sealing surface should not be more than 0,004 mm. At distance from the end of a core of the valve to a surface of the bearing of camshaft Н1 = 20,4–21,4 mm it is possible to use this valve further. At Н1 = 21,4–21,97 mm it is necessary to establish the new valve in length of 106,4 mm. At Н1 = 19,5–20,3 mm it is possible to establish the repaired valve in length of 105,5 mm.
After possible polishing of a surface of the motor block pay attention to the maximum size of a ledge of the piston which should be 0,74–0,96 mm. At a ledge of 0,96-1,16 mm establish thicker sealing laying of a head of the block of cylinders (1,85 mm).
In the ground head of the block of cylinders before its installation it is necessary to check backlog of the valve (and) and a prechamber ledge. Prechamber ledge: 7,6–8,1 mm.
5. Check phases of a gazoraspredeleniye of the engine.
6. Establish a head of the block of cylinders.