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
   4.2. General information
   4.3. Repair operations on the engine established in the car
   4.4. Check of pressure of compression
   4.5. Top dead point (VMT) of the piston of the first cylinder
   4.6. Cover of a head of the block of cylinders
   4.7. Pulley cranked shaft / quencher of krutilny fluctuations and nave
   + 4.8. Covers of a driving chain
   4.9. Driving chain
   + 4.10. Mechanism of a tension of a driving chain, asterisk and uspokoitel of a chain
   + 4.11. Drive of valves, pushers and camshaft
   4.12. Head of the block of cylinders
   4.13. Oil pallet
   4.14. Oil pump
   4.15. Replacement of a chain of a drive of the oil pump
   4.16. Drive flywheel / plate
   4.17. Replacement of sealing rings
   4.18. Bearing replacement in an end face of a cranked shaft
   4.19. Check and replacement of a support of the power unit
+ 5. Repair of 6-cylinder petrol DOHC engines
+ 6. Repair of the diesel engine established in the car
+ 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






4.12. Head of the block of cylinders

Removal

Use of an inertial hammer for extraction of the top adjusting pin of an uspokoitel of a driving chain

Unscrewing of a bolt of fastening of an arm of support of an inlet collector

Arrangement of a collar of fastening of a hose of the water pump to a head of the block of cylinders

Arrangement of a bolt of fastening of a pipe for щупа measurements of level of oil in an automatic transmission to a head of the block of cylinders

Arrangement of a contact block (1) on an arm the diagnostician of the chesky socket (2)

Removal of a head of the block of cylinders from the engine

Sequence of a tightening of bolts of fastening of a head of the block of cylinders

PERFORMANCE ORDER
1. The head of the block of cylinders acts in film on the cold engine together with inlet and final collectors.
2. Remove a weight wire from the accumulator.
3. Open and establish a cowl in vertical situation.
4. Merge cooling liquid from cooling system.
5. Remove a camshaft asterisk.
6. Screw up an additional bolt in the top adjusting pin of an uspokoitel of a chain. Using an inertial hammer and an adapter, for a head of a bolt take an adjusting pin of an uspokoitel of a chain (see fig. Use of an inertial hammer for extraction of the top adjusting pin of an uspokoitel of a driving chain).
7. Unscrew a bolt, a fixing arm of a pipe for щупа measurements of level of oil to a head of the block of cylinders.
8. Unscrew and remove two arms of support of an inlet collector (see fig. Unscrewing of a bolt of fastening of an arm of support of an inlet collector).
9. Weaken a collar and remove a short hose of the water pump from a head of the block of cylinders (see fig. An arrangement of a collar of fastening of a hose of the water pump to a head of the block of cylinders).
10. Weaken a collar and remove a hose of return of cooling liquid from a heater from the union on a back part of a head of the block of cylinders.
11. On models with an automatic transmission unscrew a bolt, fixing a pipe for щупа measurements of level of oil to a head of the block of cylinders (see fig. An arrangement of a bolt of fastening of a pipe for щупа measurements of level of oil in an automatic transmission to a head of the block of cylinders).
12. Remove pressure in fuel system and disconnect submitting and returnable fuel tubes.
13. Disconnect an accelerator cable from the butterfly valve lever.
14. On models with an automatic transmission disconnect a cable of management of pressure from draft of a butterfly valve.
15. Mark and disconnect all electric sockets from a head of the block of cylinders.
16. Take a plait of wires of the engine from fastening brackets on the engine.
17. Disconnect a vacuum hose and the electric socket from the control unit ignition.
18. Unscrew the screw and disconnect a wire from a contact block on an arm of the diagnostic socket (see fig. An arrangement of a contact block on an arm the diagnostician of the chesky socket).
19. Unscrew the diagnostic socket and disconnect the gray socket on the left side of a nest.
20. Disconnect a reception exhaust pipe from a final collector.
21. Check that all hoses and электричес cues sockets are disconnected from a head of the block of cylinders.
22. Evenly and gradually weaken bolts of fastening of a head of the block of cylinders in sequence, return shown in drawing Sequence of a tightening of bolts of fastening of a head of the block of cylinders.
23. Take bolts of fastening of a head of the block of cylinders.
24. Hook on a head of the block of cylinders slings of the load-lifting mechanism and, being careful, raise a head and take it from a motor compartment (see fig. Removal of a head of the block of cylinders from the engine).
25. Remove laying of a head of the block of cylinders.

Preparation of a head for installation

Measurement of length of a bolt of fastening of a head of the block of cylinders

PERFORMANCE ORDER
1. Interfaced surfaces of a head and the block of cylinders should be absolutely pure. For their cleaning use a firm plastic or wooden scraper. When cleaning be careful, as the aluminum alloy is very easy for damaging. Check, that the deposit did not get to oil and water canals. It is especially important for greasing system as the deposit can block supply of oil to engine components. If necessary clear channels, check interfaced surfaces of a head and the block of cylinders on existence of notches, deep scratches and other damages. If defects small, they can be removed with machining. At major defects of a detail are subject to replacement.
2. Using a metal ruler and щуп, check planeness of interfaced surfaces.
3. Clear openings under bolts in the block of cylinders. Bolt screwing up in the openings filled with oil can break off the block because of hydraulic pressure.
4. Measure length of bolts from the head basis (see fig. Measurement of length of a bolt of fastening of a head of the block of cylinders). If the length of a bolt exceeds admissible limits, replace all bolts in a set.

Installation

PERFORMANCE ORDER
1. Check that adjusting labels of cranked and distributive shaft are combined with indexes.
2. Establish laying of a head of the block of cylinders on directing pins on the block of cylinders.
3. Being careful, establish a head of the block of cylinders.
4. Grease a carving and the bottom surface of a head of a bolt, insert bolts of fastening of a head of the block of cylinders and screw in them by hand.
5. Gradually and evenly in some stages tighten bolts of fastening of a head of the block of cylinders in the sequence shown in drawing Sequence of a tightening of bolts of fastening of a head of the block of cylinders.
6. Connect a reception exhaust pipe to a final collector.
7. Connect vacuum hoses and electric sockets to a head of the block of cylinders. Fix a plait of wires of the engine brackets.
8. On models with an automatic transmission connect a cable of management of pressure to draft of a butterfly valve.
9. Connect an accelerator cable to the butterfly valve lever.
10. Connect submitting and returnable топливопроводы.
11. On models with an automatic transmission fix a pipe for щупа measurements of level of oil in a transmission to the engine.
12. Establish a hose of supply of cooling liquid to a heater on the union on a back part of a head of the block of cylinders. Connect a hose of supply of cooling liquid from the water pump.
13. Establish two arms of support of an inlet collector.
14. Screw in a bolt, a fixing arm of a pipe for щупа measurements of level of engine oil to a head of the block of cylinders.
15. Check correctness of an arrangement of an uspokoitel of a driving chain and establish an adjusting pin of an uspokoitel.
16. Establish a camshaft asterisk.
17. Add cooling liquid in cooling system.
18. Connect a weight wire to the accumulator and close a cowl.