Mercedes S-Class W-140

1991-1999 of release

Repair and car operation

Mercedes S-Class
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
- Engine
   Compression check in engine cylinders
   Engine check by means of the vacuum gage
   Belt of a streaming drive of auxiliary units
   - 6-cylinder petrol engines (M104.944 and M104.990/994)
      Cover of a head of the block of cylinders - installation details
      Removal and installation of the inlet pipeline with the resonator (except the engine 104.990)
      Final collector (except the engine M 104.990) - installation details
      Removal and installation of a head of the block of cylinders
      Removal and installation of a cover of a chain of a drive of GRM
      GRM drive - the general information, service of components
      Asterisk of a cranked shaft - installation details
      Removal and installation of a regulator of a camshaft
      Removal and installation of camshafts
      Replacement of directing plugs of valves
      Replacement of saddles of valves
      Removal and installation of pistons
      Replacement of piston rings
      Check of a condition of rods
      Check of a condition of a cranked shaft
      Service of the block of cylinders
      Removal and installation of the pallet of a case of the engine
      The oil pump - installation details
      The sensor switch of level of oil - installation details, verifying data
   + 8-cylinder petrol engines (M119.970/981 and M119.971/981)
   + 12-cylinder petrol engines (M120.980/982)
   + 6-cylinder diesel engines (OM603.971)
   + 6-cylinder diesel engines (OM606.961)
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Replacement of piston rings

Replacement of piston rings

1 — the Top kompressionny ring
2 — the Bottom kompressionny ring
3 — Maslosjemnoye a ring

4 — the Spiral spring of a dilator
8 — the Spring ring of a dilator
10 — Nippers


1. Measure gaps between rings and pistons and gaps in locks of rings (see. Specifications).
2. Remove by means of nippers (10) piston rings.
3. Measure width of piston rings.
4. Establish piston rings only with the identified width.
5. Establish rings of well-aimed «TOP» up.
6. Establish a ring (8) springs the lock opposite to the lock of a maslosjemny ring (3) (on 180 °).