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






7.12. Block of cylinders of the engine

GENERAL INFORMATION

Block of cylinders of the 4th cylinder petrol engine
1–block of cylinders;
2–back cover of a cranked shaft;
3–forward cover of a cranked shaft;
4–arm of a support of the engine;
5–forward sealing ring of a cranked shaft;
6–back sealing ring of a cranked shaft;

7–
laying of the oil pallet;
8–cover of the radical bearing;
9–a directing pin;
10-carving stopper;
11-technological cap

Block of cylinders of the 4th cylinder diesel engine
1–block of cylinders;
2–cylinder sleeve;
3–cover of the radical bearing;
4–oil pallet;
5–forward cover of a cranked shaft;
6–
back cover of a cranked shaft;

7–back sealing ring of a cranked shaft;
8–forward sealing ring of a cranked shaft;
9–laying of the oil pallet

Cleaning

Removal of a spray from the block of cylinders

Tap use for cleaning of a carving opening in the block of cylinders

PERFORMANCE ORDER
1. Remove all details and electric sensors from the block of cylinders. For complete cleaning remove technological caps. For removal of caps drill in them small openings and in openings screw in the self-cutting screw. Having pulled for a screw head, remove a cap.
2. Remove oil sprays on an internal part of the piston. For removal of a spray unscrew a bolt, remove a sealing ring and take a spray from the block of cylinders (see fig. Removal of a spray from the block of cylinders).
3. Establish oil sprays.
4. Remove all traces of laying from interfaced surfaces of the block of cylinders of the engine.
5. Remove all caps of the oil highway. At installation use new caps.
6. The most polluted places clear the ferry.
7. Clear all lubricant openings and the oil highway. Wash out all internal channels a stream of warm water until water will not leave pure. It is necessary to drain completely the block of cylinders and to grease with a thin butter layer all interfaced surfaces for prevention of emergence of corrosion. Also grease engine cylinders. If there is a compressed air, use it to accelerate process of drying and to blow all lubricant openings and highways.
8. Carefully clear all carving openings, using a tap with the corresponding carving then blow openings the compressed air.
9. Establish jams to the oil highway in the block of cylinders of the engine and reliably them fix.
10. If the engine is not subject to immediate assembly, close the block of cylinders a big plastic bag to protect it from pollution.
11. Visually check the block of cylinders on corrosion existence. Check integrity of a carving in carving openings.
12. Check diameter of cylinders of the engine on wear on step existence in the top part of the cylinder.
13. In the presence of measuring инструмен that measure diameter of a sleeve of each cylinder in the top part (under a wear step) in the center and at the basis parallel to an axis of a cranked shaft. Then make the same measurements perpendicular to an axis cranked a shaft and compare them to specifications. Repeat measurement procedure on other sleeves of cylinders. If wear exceeds admissible values, it is necessary to chisel cylinders and to establish new pistons of the increased size.

Check of a vystupaniye of the piston on diesel engines

PERFORMANCE ORDER
1. Check a vystupaniye of pistons from the block of cylinders of the engine at piston installation in the top dead point as it is especially important if the surface of a head of the block of cylinders механичес ки was processed. If the vystupaniye of pistons exceeds admissible limits, pistons at operation of the engine can strike in the vortical chamber that will lead to serious damage of the engine.
2. Measurement of a vystupaniye of pistons make at level of the top plane of laying of a head of the block of cylinders. If the vystupaniye of pistons exceeds admissible limits, it is necessary проконсульти роваться with the dealer of Mercedes-Benz and it is quite probable that it is necessary to replace the block of cylinders of the engine.