Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car

Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
- Engine
   Check of a compression in engine cylinders
   Check of the engine by means of the vacuum gage
   Belt of the streaming drive of auxiliary units
   + 6-cylinder petrol engines (M104.944 and M104.990/994)
   + 8-cylinder petrol engines (M119.970/981 and M119.971/981)
   - 12-cylinder petrol engines (M120.980/982)
      The air cleaner - installation details
      Covers of heads of the block of cylinders
      Removal and installation of the inlet pipeline
      Removal and installation of a final collector
      The valve of recirculation of the fulfilled gases - installation details
      Air supply pump
      Removal and installation of the top forward covers
      Heads of the block of cylinders
      Removal and installation of a cover of a chain of the GRM drive
      Replacement of a chain of the GRM drive
      The GRM drive - the general information, service of components
      Natyazhitel of a GRM drive chain
      Camshaft regulator
      Removal and installation of camshafts
      Check of phases of gas distribution
      Check and adjustment of position of camshafts
      Replacement of the directing plugs of valves
      Measurement of diameters of cylinders
      Removal and installation of pistons
      Check of rods
      Removal and installation of a bent shaft
      Removal and installation of the pallet of a case of the engine
      The oil level sensor switch - installation details
      The oil pump - a design and details of installation
   + 6-cylinder diesel engines (OM603.971)
   + 6-cylinder diesel engines (OM606.961)
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Removal and installation of pistons



1. Turn off conrod covers and remove rods together with pistons. Pay attention that rods and conrod covers of one cylinder have identical designation.
2. Check conrod bolts.
3. Remove a lock ring by means of the screw-driver and a vypressuyta a piston finger.
4. Check gaps in locks of piston rings and between rings and flutes of the piston.



1. Grease a piston finger and the plug of a rod.
2. Install the piston so that figures (5) and (6) were directed towards the movement and the pas tag a rod and a cover (9) was turned outside of the engine.
3. Press a piston finger by hand.
4. Insert a lock ring into a groove. Grease openings of cylinders, conrod necks, inserts and pistons with motive oil.
5. Establish a mandrel (1) of piston rings and fill the piston in the cylinder on an arrow or figure on the piston in the direction of the movement.
6. Establish conrod covers.
7. Turn a bent shaft and check ease of rotation.