Mercedes W124

since 1985-1995 of release

Repair and car operation

W124 Mercedes
+ Governing bodies and control devices
+ 2. Maintenance (diesel engines)
+ 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
- 7. Major maintenance of engines
   7.2. General information
   7.3. Recommendations about engine removal
   7.4. Removal and installation of 4-cylinder petrol engines
   7.5. Removal and installation of 6-cylinder petrol engines
   7.6. Removal and installation of diesel engines
   7.7. Sequence of dismantling of the engine
   + 7.8. Analysis of a head of the block of cylinders
   + 7.9. Assembly of a head of the block of cylinders
   7.10. Removal of pistons with rods
   7.11. Removal of a cranked shaft
   7.12. Block of cylinders of the engine
   7.13. Pistons and rods
   7.14. Cranked shaft
   7.15. Survey of radical and shatunny bearings
   7.16. Engine balance of assembly at major maintenance
   7.17. Installation of piston rings
   7.18. Installation of a cranked shaft
   7.19. Check of a working gap of radical bearings
   7.20. Installation of a cranked shaft
   + 7.21. Installation of pistons with rods
   7.22. Engine start after major maintenance
+ 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
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ 19. Mechanical transmission
+ 20. Automatic transmission

7.2. General information

The general receptions of dismantling of a head of the block of cylinders are included in this part of head and other knots of the engine.

Information concerns sequence of preparation for repair and the step-by-step description of operations of removal and installation of components of the engine, and their check.

It is not always easy to define, as where in the engine demands repair: too many factors should be taken into consideration. Big run of the engine not always is the precondition to repair and on the contrary, small run does not guarantee lack of need under repair.

The raised consumption of oil testifies to need to pay attention to a condition of piston rings, maslosjemny caps and directing valves. At making decision on repair of the specified knots certify in lack of a leak of oil. Compression measurement in engine cylinders can give additional information on volumes of repair.

Check size of pressure of oil by means of a manometer established instead of the sensor of pressure of oil. The lowered size of pressure of oil testifies to wear of bearings or damage of the oil pump.

Capacity falling, non-uniform operation of the engine, blows and the mechanical noise, the increased noise of the klapanny mechanism and high fuel consumption, as a rule, testifies to need of repair, especially, if all these troubles arose at the same time.

At major maintenance of the engine replacement of pistons and piston rings is made, and cylinders are chiseled. Also new radical and shatunny bearings, and in case of need are established, necks of a cranked shaft перешлифовываются and are established shatunny and radical bearings of the repair sizes. Special attention turn on a condition of the oil pump and if there are doubts concerning its reliability, replace it. Hoses of system of cooling, the thermostat and the water pump are subject to obligatory replacement.

Repair of the engine comes easy, if all works to carry out accurately and to have necessary tools and the equipment.