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
+ Systems of cooling, heating
+ Power supply system and release
- Engine electric equipment
   + ignition and engine management Systems - the general information
   - Charge and start systems
      The storage battery - the main data, shutdown and acquisition of the new battery
      Check and charging of the storage battery
      Storage of the storage battery
      Charging system - general information and security measures
      Check of system of a charging
      Details of installation of the generator
      System of start of the engine - the general information and precautionary measures
      Check of system of start of the engine
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



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The storage battery - the main data, shutdown and acquisition of the new battery

See also Section Check of a condition of the battery, care of it and gymnastics of Head Routine maintenance


Established 12 In the battery consists from six banok, containing positive and negative plates which are lowered in solution of sulfuric acid. The problem of the battery includes current production for start of the car, ignition and for lighting, and also for other consumers of the electric power.

The battery possesses 100 % efficiency at 27°С. At - 18°С efficiency falls to 40 %. Now to start the engine, it is necessary to have more than twice more energy, than it was necessary at 27°С.

The starting capacity (starting current) shows ability of the accumulator to start the car in the conditions of very cold weather. It shows a current in amperes which gives the accumulator within 30 seconds at - 18°С without power failure below 7.2 Volts (the minimum level demanded for reliable start). The this indicator, the more starting capacity of the accumulator is higher.

The reserve capacity shows time in minutes during which the accumulator gives a current of 25 Amperes at 27°С., i.e. time during which the accumulator ensures functioning of all auxiliary devices in the car at night and in the conditions of bad weather at the faulty generator.

In winter conditions at - 18°С and below the battery will be badly charged in connection with increase of internal resistance. At short trips in the winter the energy spent by the battery for start, is not restored. As a result the battery works very hard, is constantly discharged and eventually refuses.

In summer months after long trips the engine strongly heats up, and often happens that it is difficult for starting anew. Such «hot starts» sometimes demand as much capacity, how many and at cold weather, or it is more. Especially it extends on vysokokompressionny engines with large working volume and cars with the conditioner. It once again emphasizes importance of a right choice of the accumulator according to the car engine.

Acquisition of the new storage battery

Probably, the most important, on what the buyer should pay attention, are characteristics of the accumulator. Their three.

The first - rated voltage, it at all batteries identical, and it is impossible to be mistaken. Upon purchase it is desirable to check the storage battery a loading fork.

The second - the capacity measured in ampere/hours (And/h), means, roughly speaking, the quantity of the electric power which is storing in the accumulator. On capacity depends, as it is long possible to twist a starter the engine, is more exact - how many it is possible to make attempts of start of the engine. The price of the accumulator is almost directly proportional to its capacity.

And the third characteristic - a starting current (it is measured in amperes: А), i.e. a current submitted on a starter during start-up. On accumulators it can specify on four different systems: GOST (on domestic), EN (a standard of Uniform Europe), SAE (the American standard) and DIN. The last, German standard, is closest to our state standard specification and on the majority of the European is put "by default" i.e. when the system of a standard is not specified. The it is more, the quicker and with bigger force the starter will turn the engine.

It is better, if you buy the storage battery with those characteristics which are specified in the maintenance instruction of your car: so it will serve to you more long at the minimum expenses. It is possible to save and buy the battery of smaller capacity, but it will serve you less usual term and it is bad to cope with winter start. Having bought the battery even not much more bigger capacity, you will not win in service life since constant недозаряд the accumulator will lead to a sulfatatsiya of plates, and will lose in money. To be fond of the raised starting current also does not follow: will burn a starter. Replace oil in the engine better, and problems with start will not be.

Lately the market of the country is overflowed with the poor-quality goods and fakes. Accumulators are not an exception. There are some signs on which it is possible with sufficient accuracy to distinguish the original from a fake. The first and, perhaps, main thing: on the accumulator the country manufacturer and letting-out plant should be surely specified, it is better, if with the address. The second - manufacturing date that is very important, if the accumulator filled in should be specified. Technical data sheet, and here existence of the instruction should be applied to each battery it is unessential. It is connected with that in the West accumulators almost do not sell at retail, they are established by experts at service stations. The third - the high-quality accumulator is inconceivable without the high-quality case, good jams and the smooth vyvodny plugs quite often greased with technical protective greasing from oxidation and covered from above with color plastic caps.