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


3.1.16. Compression

GENERAL INFORMATION

Check of a compression allows to draw conclusions on an engine condition. At its check it is possible to establish, whether in norm valves or pistons (piston rings) or they are worn-out. Besides, by results of control it is possible to define, whether the engine is subject to replacement or it can be repaired in a complex. For check the device is necessary for compression control.

The pressure difference between separate cylinders should make at most 1,5 bar. If the difference in pressure makes more than 1,5 bar, it is a sign of defective valves, worn-out piston rings or directing the cylinder. If will reach a wear limit, it is necessary to repair or replace the engine.

Pressure of compression should make: for the 4-cylinder engine 10-14 a bar, for 6-cylinder near the 12th bar.
PERFORMANCE ORDER
1. For control of a compression warm up the engine. After achievement of working temperature of cooling liquid pass 5 more km to provide sufficient temperature of engine oil.
2. Raise an engine cowl.
3. Engine in volume of 1,8/2,0 l: switch off ignition. The sensor of a position of a cranked shaft (L5) disconnect from a PMS monitor.
4. Engine in volume of 2,2/2,8 l: switch off ignition. Remove a monitor covering behind a forward wall of a body. Disconnect the tip (And) from a HFM monitor (N3/4).
5. Unscrew all spark plugs.
6. Several times scroll the engine a starter to remove deposits and soot.
Prevention

Establish a transmission in the provision of idling and tighten the parking brake. During a prokruchivaniye do not bend over the engine: danger of a trauma!


7. The device of control of a compression (01) according to the maintenance instruction insert or twist a rod (04) in a spark plug opening. Enter a new leaf for the chart (03), (02) an intermediate detail.
8. Charge to the assistant to press an accelerator pedal against the stop and to hold it till the end of check pressed.
9. The engine should make about eight turns, pressure lifting by the measuring device will not be fixed yet.
10. One by one check all cylinders and compare to nominal rate.
11. Then insert spark plugs.
12. At the switched-off ignition put on the sensor of a position of a cranked shaft PMS or a HFM monitor. Establish a cover of the operating HFM device.
13. Close a cowl.