Mercedes S-class W202

1993-2000 of release

Repair and car operation



Mercedes W202
+ 1.2. The general data
+ 2. Maintenance service
- 3. Engines
   3.1.2. Identification number
   + 3.1.3. The engine
   3.1.4. Cars with the conditioner
   3.1.5. The bottom cover of a motor compartment
   3.1.6. Covers of cast apertures
   3.1.7. Натяжитель chains
   + 3.1.8. A cover of a head of the block of cylinders
   + 3.1.9. A head of the block of cylinders
   + 3.1.10. Camshafts
   3.1.11. Hydraulic тарельчатые 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. A compression
   + 3.1.17. A klinovyj belt
   3.1.18. Diagnostics of malfunctions (DB)
   3.1.19. Broad-brush observations
   3.1.20. Repair work without engine dismantle
   + 3.1.21. Engine major repairs
   + 3.2. The diesel engine (ДД)
   3.2.3. Cars with the conditioner
   3.2.4. The bottom cover of a motor compartment
   3.2.5. Covers of cast apertures
   3.2.6. Натяжитель chains
   + 3.2.7. A camshaft
   + 3.2.8. A head of the block of cylinders
   + 3.2.9. Maslootrazhatelnye caps
   3.2.10. A cover of a head of the block of cylinders (2,2/2,5)
   3.2.11. Hydraulic тарельчатые 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. A head of the block of cylinders and the motor block
   3.2.16. A compression
   3.2.17. Клиновой a ridge belt
   3.2.18. The pulling device клинового a ridge belt
   3.2.19. Diagnostics of malfunctions (ДД)
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. A running gear
+ 11. A steering
+ 12. Brake system
+ 13. A body
+ 14. An electric equipment
+ 14.2. Electroschemes











3.2.16. A compression
THE GENERAL DATA

Compression check allows to draw conclusions on an engine condition. It will help to define, whether there are valves or pistons (a ring of pistons) in a normal state or they are worn out. Besides, based on the results of testing it is possible to solve, whether the engine is subject to replacement or it should be repaired in a complex. For the control it is necessary компрессометр, intended specially for diesel engine check. Kompressionnoe pressure in the new engine should be 26–32 bar. The difference of pressure between separate cylinders should make no more than 3 bar. If one or several cylinders have the pressure different from others more than on 3 bars it is a sign of the defective valves, the worn out piston rings or pistons in cylinders.

The sequence of actions under the compression control is resulted for the engine in volume of 2,0 l.
PERFORMANCE ORDER
1. Raise a cowl.
2. Remove atomizers.
3. Unscrew a tank of a liquid for screen wipers, disconnect it and put aside.
4. The engine in volume of 2,0 l: that at turn of the engine by means of a starter fuel was not injected, the lock lever (arrow) should be established in position "stop". For this purpose connect the vacuum pump to a tank (marksman) of the fuel pump. Create in a tank depression nearby 400 мбар and support it during all time of the control of a compression.
5. Some times turn the engine a starter to remove a deposit and a soot.
The prevention

Establish a transmission on idling and tighten a lay brake. During time прокручивания the engine do not bend over it: accident is possible!


6. Screw компрессометр (01) with an element of communication (02) and a detail of connection (03) to the place of an atomizer in the prechamber of the cylinder subject to check.
7. Ask the assistant to press to the full a pedal of an accelerator and to keep it in the course of check.
8. Turn the engine approximately on 9 turns, pressure lifting on the measuring device will not stop yet.
9. Remove value of controllable size and consistently check up a compression in all other cylinders. Then compare the measured sizes to rating values. Thus keep in mind that results of measurement depend and from used компрессометра. If in one or several cylinders компрессионное pressure below minimum it is necessary to check up tightness of the cylinder.
10. Unscrew компрессометр (02) and establish atomizers with new linings.
11. Remove the vacuum pump.
12. Establish a tank of a liquid of screen wipers and fix bolts.
13. Lower an engine cowl.

Features of engines in volume of 2,2/2,5 l


PERFORMANCE ORDER
1. Remove a cross-section pipe of the air filter.
2. Unscrew a covering of a cover of a head of the block of cylinders (4).
3. Remove an atomizer (18) with pipelines of injection of fuel (17).
4. Компрессометр (01) fasten, according to the maintenance instruction, with the help подсоединительной details (02) to the prechamber. Establish a new chart paper (03).