Notes on coolant - AH20.00-N-2080-01A
All engines
Coolant composition
Passenger car and commercial vehicle engines (normally): 50% water by volume and 50% anticorrosion/antifreeze agent by volume.
Different coolant composition for CV engines, refer to MB Specifications for Operating Fluids .
Tasks of anticorrosion/antifreeze agent
- Corrosion and cavitation protection for all components in cooling system
- Antifreeze protection (frost protection)
- Increase the boiling point so that coolant does not evaporate so rapidly. Avoiding ejection of coolant at high coolant temperatures.
Antifreeze protection
50% anticorrosion/antifreeze agent by volume provides antifreeze protection down to approx. -37°C. A higher concentration is only necessary if the ambient temperatures are even lower. 55% anticorrosion/antifreeze agent by volume provides antifreeze protection down to approx. -45°C .
A concentration of more than 55% anticorrosion/antifreeze agent by volume should not be used as the maximum antifreeze protection is already reached at this concentration. An even higher concentration once reduces antifreeze protection and impairs heat dissipation. Reduced heat dissipation can result in damage to components of the cooling system and to the engine
Scheme 30
Water
Use water which is clean and not too hard. Drinking water often satisfies requirements, but not always The amount of dissolved substances in the water may be of significance for the occurrence of corrosion. If in doubt, analyze the water.
For fresh water specifications refer to MB Specifications for Operating Fluids.
Period of use
The maximum permissible period of use of the coolant is given in the maintenance booklet, the applicable "Service/Maintenance Sheet" or the MB-Specifications for Operating Fluids.
For the period of use for a varying coolant composition for CV engines, refer to MB Specifications for Operating Fluids.
Before pouring in fresh coolant, flush the used coolant out of the cooling system. In the case of severe fouling by dirt or oil, clean the cooling system otherwise components of the cooling system can be damaged
Disposing of coolants
Observe the legal provisions and local waste water regulations. The following brochures are available about disposing of waste products in auto repair trade for the location Federal Republic of Germany
"Environmental protection manual for motor vehicle repair operations"
Publisher: Verband der Automobilindustrie e.V. (VDA) 60325 Frankfurt am Main, Westendstraβe 61 to be ordered under
Tel no.: 069/97507-0 or at www.vda.de
or
"The new waste laws"
Publisher: Zentralverband Deutsches Kraftfahrzeuggewerbe e. V. (ZDK) 53129 Bonn, Franz-Lohe-Straβe 21 to be ordered under
Tel no.: 0261/8059-584, Fax no. 0261/8059-585 or at www.kfz-meistershop.de
Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant. - AS20.00-Z-0001-01A
Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage bottles.
Wear protective gloves, protective clothing and eye protection.
Possible hazards
Risk of injury
When the engine is warm, the cooling system is pressurized. If the cooling system is opened suddenly, there is a risk of scalding from hot coolant which splashes out.
Danger of poisoning
If coolant is swallowed, this can result in manifestations of poisoning such as headaches, dizziness, stomach pain, respiratory paralysis, unconsciousness, vomiting and cramps.
Safety precautions/instructions
- Allow cooling system to cool down to a coolant temperature of less than 90 °C.
- Open cap of cooling system slowly; turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure.
Wear protective gloves, protective clothing and eye protection.
Do not pour coolant into beverage bottles.
First aid measures
- Rinse affected skin with large quantities of cold water and cover with sterile bandages.
- Allow the person affected to drink plenty of water with the addition of medicinal charcoal.
- If the person has suffered severe burns or has swallowed coolant, contact a doctor.
Safety information: Engine cooling system - AS20.00-Z-9999ZZ
MODEL all
Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant. ENGINE all AS20.00-Z-0001-01A
Coolant pump, coolant thermostat - BA20.10-P-1000-01J
Engine 132, 160
| 3.11.04 | Tightening torque for banjo bolt for cooling water connection to major assembly carrier altered from 14 to 19 Nm | Value for engine 160.910/920/921/922 altered |
|---|---|---|
| Tightening torque for thermostat housing bolt to cylinder head altered from 14 Nm to 12 Nm | Value modified for engine 160.920/921/922 |
MODIFICATION NOTES
| Number | Designation | Engine 132.9 | Engine 160.910 | Engine 160.920 | ||
|---|---|---|---|---|---|---|
| BA20.10-P-1001-01J | Belt pulley to coolant pump | Nm | 10 | 10 | 10 | |
| BA20.10-P-1002-01J | Bolt, coolant pump to major assembly carrier | Nm | 9,5 | 9,5 | ||
| BA20.10-P-1003-01J | Bolt, major assembly carrier to crankcase | Nm | 20 | 20 | ||
| BA20.10-P-1004-01J | Banjo bolt, coolant connection to major assembly carrier | Nm | 19 | 19 | ||
| BA20.10-P-1005-01J | Bolt, thermostat housing to cylinder head | Initial torque | Nm | 12 | 12 | |
| Continued torque | Nm | 9.5 | 9.5 | |||
| BA20.10-P-1006-01J | Bolt, water supply connection fitting to major assembly carrier | Initial torque | Nm | 14 | 14 | |
| Continued torque | Nm | 9.5 | 9.5 | |||
| BA20.10-P-1007-01J | Bolt, coolant pump to timing case cover | M6 | Nm | 10 | ||
| M8 | Nm | 23 | ||||
| BA20.10-P-1008-01J | Bolt, thermostat housing to crankcase | Nm | 10 | |||
| BA20.10-P-1009-01J | Bolt, coolant pipe to crankcase | Nm | 10 | |||
| BA20.10-P-1010-01J | Bolt, coolant pipe to oil pan | Nm | 10 | |||
| BA20.10-P-1011-01J | Bolt connecting coolant line to cylinder head | Nm | 24 | |||
| BA20.10-P-1012-01J | Bolt, coolant line to crankcase | Nm | 24 | |||
COOLANT PUMP, COOLANT THERMOSTAT
| Number | Designation | Engine 160.921 | Engine 160.922 | Engine 160.923 | ||
|---|---|---|---|---|---|---|
| BA20.10-P-1001-01J | Belt pulley to coolant pump | Nm | 10 | 10 | 10 | |
| BA20.10-P-1002-01J | Bolt, coolant pump to major assembly carrier | Nm | 9.5 | 9.5 | 9.5 | |
| BA20.10-P-1003-01J | Bolt, major assembly carrier to crankcase | Nm | 20 | 20 | 20 | |
| BA20.10-P-1004-01J | Banjo bolt, coolant connection to major assembly carrier | Nm | 19 | 19 | 19 | |
| BA20.10-P-1005-01J | Bolt, thermostat housing to cylinder head | Initial torque | Nm | 12 | 12 | 12 |
| Continued torque | Nm | 9.5 | 9.5 | 9.5 | ||
| BA20.10-P-1006-01J | Bolt, water supply connection fitting to major assembly carrier | Initial torque | Nm | 14 | 14 | 14 |
| Continued torque | Nm | 9.5 | 9.5 | 9.5 | ||
| BA20.10-P-1007-01J | Bolt, coolant pump to timing case cover | M6 | Nm | |||
| M8 | Nm | |||||
| BA20.10-P-1008-01J | Bolt, thermostat housing to crankcase | Nm | ||||
| BA20.10-P-1009-01J | Bolt, coolant pipe at crankcase | Nm | ||||
| BA20.10-P-1010-01J | Bolt, coolant pipe to oil pan | Nm | ||||
| BA20.10-P-1011-01J | Bolt connecting coolant line to cylinder head | Nm | ||||
| BA20.10-P-1012-01J | Bolt, coolant line to crankcase | Nm | ||||
COOLANT PUMP, COOLANT THERMOSTAT
Mixture ratio for coolant - BF20.00-P-1000-04A
Engine all
| Number | Designation | Engine all | ||
|---|---|---|---|---|
| BF20.00-P-1001-04A | Mixture ratio for coolant | Antifreeze/water | Up to -37°C | 50/50 |
| Up to -45°C | 55/45 | |||
| Specifications for Operating Fluids | Sheet | BB00.40-P-0310-01A | ||
| Sheet | BB00.40-P-0325-00A | |||
MIXTURE RATIO FOR COOLANT
Engine cooling function - GF20.00-P-1000MCU
ENGINE 132.9 in MODEL 451.3 /4
Scheme 31
General
Components of the engine suffer high thermal loading from the combustion taking place in the engine.
Apart from actually leading away excess heat a cooling system must also fulfill the following tasks
- Rapid reaching of the engine operating temperature
- Holding the engine operating temperature as constant as possible under all driving conditions
- Protecting engine lubricants from overheating
- Protecting fresh air from excessive warming in order to allow high efficiency of the engine
- Lowering the temperature in the combustion chamber in order to avoid uncontrolled self ignition
Function
The engine cooling is subdivided into a small and a large coolant circuit.
For a cold engine the coolant flows via the small coolant circuit from the coolant pump through the engine to the thermostat and back to the coolant pump.
If the engine has reached its operating temperature, the thermostat opens the large coolant circuit. This subdivides immediately after the thermostat into the cooling circuit and the heating circuit. In the cooling circuit, the coolant flows via the coolant feed pipe for the cooling circuit to the radiator and from there via the coolant return line back to the coolant pump.
In the heating circuit the coolant flows via the coolant feed pipe for the heating circuit to the heater heat exchanger and further to the expansion reservoir. The coolant flows via the coolant return line from the expansion reservoir back to the coolant pump.
If the coolant was partially or fully drained off the coolant circuit must be bled. Filling and bleeding of the coolant circuit may only be undertaken on a cold engine
| Component description for the coolant thermostat | GF20.10-P-3162MCC |
450 589 06 37 00 Pliers - WS20.00-P-0040B
FG 20/Set B
MODEL 450, 451, 452, 451
Use
Pliers for assembling click clamps.
Note. Pliers for click clamps Smart No. 0005082
Scheme 32
Scheme 33
450 589 07 37 00 Pliers - WS20.00-P-0041B
FG 20/Set B
MODEL 450, 451, 452, 451
Use
Pliers for assembly of click clamps at points which are not easily accessible.
Note. Pliers for click clamps (slanted) Smart No. 0005083
Scheme 34
450 589 01 21 00 Antifreeze spindle - WS20.00-P-0042A
FG 20/Set A
MODEL 450, 451, 452, 454
Use
Antifreeze spindle for determining the antifreeze content in the coolant.
Note. Antifreeze spindle, smart no.: 000 5095 V001 0000 00
Scheme 35
Scheme 36
450 589 11 37 00 Pliers - WS20.00-P-0043B
FG 20/Set B
MODEL 450, 452
MODEL 451 with ENGINE 132
Use
Cutting pliers for plastic lines at tank.
Note. Cutting pliers Smart No.: 0014667
Scheme 37
451 589 01 31 00 Mounting fixture - WS20.00-P-0060C
FG 20/Set C
MODEL 451
Use
Mounting for fixing radiator for a removed front mask.
Note. Two pieces are required.
Scheme 38
451 589 02 31 00 Adapter - WS20.00-P-0061B
FG 20/Set B
MODEL 451
Use
Adaptation for assembly of clamps on heat exchanger and cooler.
Note. Only in combination with W003 589 03 37 00 hose clamp pliers.
