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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz E-Class W123 (from 1976 to 1985, the year of issue)

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Mercedes-Benz W123
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W123
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Electrical
Design and specifications
Removing and installing the battery
Topping up the electrolyte in the battery
Charging the battery
Technical obsluzhiva?�nie generator and special precautions
Removing and installing the generator
Check the vehicle alternator and voltage regulator
Removal, survey and installation of generator brushes
Removing and installing starter
Repair of starter
Fuses and relays
Windscreen
Schematic diagrams of electrical equipment
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Electrical




Design and specifications

Electrical 12 volt, with the negative terminal to ground. The battery is recharged by the alternator with a belt drive and a built-in voltage regulator.

Starter preliminary engagement: the traction relay enters the pinion gear engages with the ring gear to the power supply to the starter motor.

This section gives a repair procedure, although in some cases more profitable units is entirely replaced with worn nodes.

Every 16,000 km of running, check the operation of all electrical units and the electrolyte level in the battery. If necessary, top up the electrolyte. At the same time check the wear of the wiper blades and replace them if necessary.

Type of electrical equipment: 12 V, negative terminal to ground.

Accumulator battery

Characteristic

Value

Capacity Ah

55

Generator

Characteristic

Value

Type

Bosch 55A 65A or

Charging current at engine speeds A

  • 123,920 motor M

36 at 1040 rev / min,
55 at 3130 rev / min

  • 123,921 motor M

36 at 930 rev / min
55 at 2760 rev / min

  • motor M 110 (through March 1980)

36 at 1040 rev / min,
55 at 3130 rev / min

  • motor M 110 (March 1980) with the generator 55 A

36 at 930 rev / min
55 at 2760 rev / min

  • motor M 110 (March 1980) with the generator 65 A

43 at 980 rev / min
65 at 2760 rev / min

The lowest allowable height brushes mm

5

Starter

Characteristic

Value

Type

with preliminary gearing

power, kWt

0.85; 1.04 or 1.5

The lamps used in vehicles, W:

Assigning lamps

Value

Lamps lights (halogen)

60/65

Fog lamp bulbs (halogen)

55

Indicator lamps

21

Indicator lamps and front position lamps

21/5

Lamps of stoplights

21

Lamps light Reversing

21

Lamp for license plate illumination

5

Lamps taillamps

10

Lamps parking lamps front

4

Lamps rear fog light

21

Interior light

10

Lamps lighting the glove box

5

Lamps lighting the luggage

10

Maintenance Battery

The standard battery has an automatic device to prevent overflow of the electrolyte. If the electrolyte level below the upper mark on the front side of the battery, remove the filler plugs or cap and top up with distilled water prior to the water filling the cavities of the rubber stoppers (see. Fig.). If this level is provided by the filling elements and covering the electrolyte separator plates.

Keep clean the top surface of the battery, preventing the accumulation of dust on it, and moisture, which will eventually cause a partial self-discharge of the battery.

Check corrosion brackets and battery mounting platform. If you find corrosion, remove the battery, remove corrosion products, treat the skin surface corresponding anticorrosive and apply a coat of paint the original color.

Each time you remove the battery, inspect it for cracks and leaks. Cracks may appear in the winter time when topping up with distilled water after a ride, and not prior to departure. In this case, water not had time to mix with the electrolyte freezes and breaks the wall of the tank battery. Cracks can be repaired tank corresponds to the composition, but it depends on the material of the tank. If one of the battery cells leak, fill it with fresh electrolyte.

Excessively high level of electrolyte in an undamaged tank battery indicates battery recharging and possible malfunction of the voltage regulator.

With a small annual mileage car is recommended every three months to check the specific gravity to determine the state of charge of the battery. To check, use a hydrometer, is inserted through a rubber stopper, comparing the results with the data given below:

Characteristic

Value

Ambient temperature 25 ?� C

  • full charge

1,270-1,290

  • Charge 70%

1,230-1,250

  • full charge

1,110-1,130

Keep in mind that the grading is done hydrometer for the electrolyte temperature of 15 ?� C. Therefore subtracted from the measured value of 0.007 for every 10 ?� C below 15 ?� C. and add 0.07 for every 10 ?� C above the temperature of 15 ?� C.

If the battery condition is causing your suspicions, check first of all the density of the electrolyte in each cell. The difference is 0,040 or more between any elements of evidence of loss or deterioration of the electrolyte plates.

Tightening torques of the main threaded connections kgs.m

Connection Type

Value

Fixing starter

2.5





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