System type
4-cylinder gasoline engines — A high-pressure system with a cross-flow or drop-down radiator, with a radiator fan driven by an auxiliary unit drive belt with an electromagnetic coupling, a centrifugal water pump driven by an additional belt, a bypass path thermostat and a separate expansion tank.
6-cylinder gasoline engines — A high-pressure system with a cross-flow or drop-down radiator, a radiator fan driven by a drive belt of auxiliary units with viscous engagement, a centrifugal water pump driven by an additional belt, a bypass path thermostat, a separate expansion tank and overflow tank.
Diesel engines - High pressure system with cross or down flow radiator, radiator fan driven by accessory drive belt with thermostatically controlled thermo-viscous or electromagnetic engagement, centrifugal type water pump driven by auxiliary belt, bypass thermostat, separate expansion tank and overflow tank.
General
Pressure cap opening pressure:
- Models produced before 1987 - 1.2 bar
- Models produced after 1987 - 1.4 bar
Maximum coolant temperature:
- Models produced before 1987 - 125°C
- Models after 1987 - 129°C
Radiator Fan Electromagnetic Engagement Thermal Switch:
- Switch-on temperature - 102°C max
- Shutdown temperature - 98°C
Thermostat
Petrol engines:
- Opening start - 87±2°C
- Fully open - 102°C
Naturally aspirated diesel engines:
- Opening start - 85±2°C
- Fully open - 94°C
Turbocharged diesel engines:
- Opening start - 80±2°C
- Fully open - 100°C
Coolant
Type - Soft water and antifreeze approved by Mercedes
Percentage of water and antifreeze: *
- Protection up to - 37°C - 50% water and 50% antifreeze by volume
- Protection up to - 45°C - 45% water and 55% antifreeze by volume
*Note: Do not use coolant more than 55% antifreeze, as this will impair heat dissipation and reduce the antifreeze effect.
Cooling system capacity:
4-cylinder petrol engines:
- With automatic heating system - 8.5 liters
- With air conditioning - 9.5 liters
6-cylinder petrol engines:
- With automatic heating system - 9.0 liters
- With air conditioning - 9.5 liters
4-cylinder 2.0 liter diesel engines:
- With automatic heating system - 8.5 liters
- With air conditioning - 9.0 liters
5-cylinder 2.5-liter naturally aspirated diesel engines:
- With automatic heating system - 9.0 liters
- With air conditioning - 9.5 liters
5-cylinder 2.5 liter diesel engines
- turbocharged (all models) — 9.0 liters
Tightening torque of connections, N·m
Water Pump to Crankcase/Timing Cover:
- 4-cylinder petrol engines - 10
- 6-cylinder petrol engines - 23
- Diesel engines - 10
Water pump to body (diesel engines) — 10
Water Pump Belt Pulley:
- 4-cylinder petrol engines - 15
- 6-cylinder petrol engines - 10
- Diesel engines - 15
Radiator fan to electromagnetic/viscous clutch:
- 4-cylinder petrol engines - 25
- 6-cylinder petrol engines 10
- 4-cylinder diesel engines - 25
- 5-cylinder diesel engines - 10
Viscous coupling radiator fan to water pump / bearing housing - 45
Text republished from the website: www.MercedesMan.ru
Electromagnetic clutch to water pump/support bracket - 6
Radiator drain plug - 2
Thermostat housing cover:
4 cylinder petrol engines:
- With metal thermostat housing - 10
- With plastic thermostat housing - 8
6 cylinder petrol engines - 6
Diesel engines - 10
Thermostat housing to cylinder head (for 4 cylinder petrol engines only) — 20
Alternator Support Bracket Bolts - 45
Cylinder Block Drain Plug - 30
Automatic Transmission Fluid Heat Exchanger Connections - 20