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
- 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
+ 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






7.14. Cranked shaft

GENERAL INFORMATION

Check axial люфта a cranked shaft with use of the indicator of hour type

Check axial люфта a cranked shaft with edge use щупа

Measurement by a micrometer of a shatunny neck of a cranked shaft

Check axial люфта cranked shaft

PERFORMANCE ORDER
1. Check axial люфта a cranked shaft is made, when it is established in the block of cylinders of the engine.
2. Check axial люфта is made by the indicator of the hour type which arm is established on the block of cylinders of the engine, and the measuring tip leans in an end face of a cranked shaft.
3. Moving a cranked shaft from an emphasis against the stop along an axis, measure size axial люфта. The result of measurement indicates need of use of new persistent half rings.
4. In the absence of the indicator of hour type axial люфт a cranked shaft it is possible to measure by an edge щупа, having moved a cranked shaft to one party against the stop and having measured a gap between a persistent half ring and cranked shaft.

Check

PERFORMANCE ORDER
1. Clear a cranked shaft, using the corresponding solvent, and drain it the compressed air.
2. Check radical and shatunny necks of a cranked shaft on wear, corrosion and cracks.
3. Wear of a shatunny neck is characterized by metal knocks at operation of the engine, especially under loading on small turns and reduction of pressure of oil.
4. Wear of radical necks of a cranked shaft is characterized by strong vibration of the engine and the metal knock increasing at increase in turns of the engine, and also reduction of pressure of oil.
5. Check necks of a cranked shaft on a roughness. Any appreciable roughness specifies that a cranked shaft it is necessary перешлифовать or to replace.
6. If the cranked shaft was перешлифован, check agnails round openings for greasing. In the presence of agnails remove them with a small file or a shaber and carefully clear openings and channels of shaving.
7. Using a micrometer, measure diameter of radical and shatunny necks of a cranked shaft and compare results to technical requirements. Measurement of necks make in several points both on diameter, and on length of a neck that will allow to reveal ovality and a konusnost if they are present.
8. Check surfaces of contact of oil consolidation on each end of a cranked shaft on wear and other damages. If wear of a neck from consolidation big, that, probably, is required replacement of a cranked shaft.
9. On some engines if necks of a cranked shaft were перешлифованы for the repair size it is necessary to establish loose leaves of the increased size.