Mercedes W124

since 1985-1995 of release

Repair and car operation



W124 Mercedes
+ Governing bodies and control devices
+ MAINTENANCE
+ 2. Maintenance (diesel engines)
+ ENGINE
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
- 6. Repair of the diesel engine established in the car
   6.2. General information
   6.3. Repair operations on the engine established in the car
   6.4. Check of pressure of compression
   6.5. Top dead point (VMT) of the piston of the first cylinder
   6.6. Cover of a head of the block of cylinders
   6.7. Pulley cranked shaft / quencher of krutilny fluctuations and nave
   6.8. Cover of a driving chain
   6.9. Driving chain
   + 6.10. Mechanism of a tension of a driving chain, asterisk and uspokoitel of a chain
   + 6.11. Camshafts and pushers
   6.12. Head of the block of cylinders
   6.13. Oil pallet
   6.14. Oil pump and driving chain
   6.15. Drive flywheel / plate
   6.16. Replacement of sealing rings of a cranked shaft
+ 7. Major maintenance of engines
+ COOLING SYSTEM
+ FUEL SYSTEM
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
+ 12. Fuel system of diesel engines
+ 13. Fuel system of diesel engines
+ SYSTEMS OF START, IGNITION
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ PRESTARTING HEATING
+ TRANSMISSION
+ 19. Mechanical transmission
+ 20. Automatic transmission
+ POWER SHAFTS
+ BRAKE SYSTEM
+ SUSPENSION BRACKET
+ BODY
+ ELECTRIC EQUIPMENT
+ CHECK OF MALFUNCTIONS






6.4. Check of pressure of compression

GENERAL INFORMATION

Prevention

For check of pressure of compression it is necessary to use a compress meter for diesel engines.


Check of a condition of the engine can be made by measurement of pressure of compression in cylinders. If this check to make regularly, it is possible to learn in advance the beginning of wear of the engine, without waiting the moment when wear will be shown in low overall performance of the engine.

PERFORMANCE ORDER
1. Using компрессометр with переходни a lump, check pressure of compression in engine cylinders.
2. Before check of pressure of compression check, that the accumulator was charged and in a good condition. The air filter should be pure, and the engine should be heated-up to normal working temperature. Before check unscrew glow plugs. For prevention of start of the engine at carrying out check remove the relay of shutdown of fuel.
3. Establish an adapter with kompressometry in an opening for installation of candles of an incandescence.
4. Turn the engine a starter. After a provorachivaniye of a cranked shaft pressure of compression should increase by 1 or 2 turns to a maximum and then be stabilized. Make record of most received result. Similarly check other cylinders.
5. Pressure of compression in all cylinders should not differ more than on two units. Pay attention that the size of compression should increase quickly on the serviceable engine. Low pressure of compression on the first turn of the cranked shaft, accompanied by gradual increase in pressure on the subsequent turns, indicates wear of piston rings. The low size of pressure on the first turn of a cranked shaft which slightly increases further, indicates a thinness of a prileganiye of the valves, the punched laying of a head of the block of cylinders or existence of cracks in a head of the block of cylinders.
6. After carrying out check of pressure of compression establish the relay of shutdown of fuel and establish glow plugs.