Contents: Gasoline engine ↡ Diesel engine ↡
Coolant pump and thermostat. 4-cylinder petrol engine 111
1 — Thermostat housing sealing ring; 2 - Cork; 3 — Sealing ring; 4 — Lid; 5 — Bolt M8, 25Nm; 6 — Coolant pump; 7 — Bolt M8, 25Nm; 8 — Bolt, 10Nm; 9 — Pulley; 10 — Bolt M6, 10Nm; 11 — Bolt, 10Nm; 12 — Thermostat cover; 13 — Thermostat; 14 — Thermostat cover sealing ring; 15 — Coolant pump sealing gasket; 16 — Thermostat housing; 17 — Clamp; 18 — Coolant hose; 19 — Gasket; 20 — Clamp
Note: The illustrations show the thermostat detached from the thermostat cover. The thermostat is built into the cover and can be tested in the kit.
Gasoline engine
Removal
Note: The thermostat is built into the thermostat cover and can only be replaced as a set with it.
Caution! When the engine is hot, cover the expansion tank with a thick cloth before opening it to prevent burns from hot coolant and steam. The cap should only be removed when the coolant temperature is below + 90°C.
1. Drain the coolant into a container as described in Section Coolant Replacement - General Notes.
2. Remove the engine covers at the front (2) and left (1).
3. Remove the coolant hoses from the radiator and the expansion tank on the thermostat cover. First, loosen the clamps and move them all the way back.
4. Unscrew the thermostat cover and remove it together with the thermostat.
Attention! The thermostat and thermostat cover form a single unit. When removed, the thermostat may be damaged and cannot be reinstalled.
5. Remove the thermostat housing gasket and clean the sealing surfaces.
Installation
1. Install a new sealing ring, thermostat cover with thermostat and tighten to a torque of 10 Nm.
2. Place the coolant hoses on the connecting fittings and secure with clamps.
Note: When doing this, check the condition of the hoses and clamps and replace them if necessary.
3. Install the front and left engine covers.
Diesel engine
Coolant pump and thermostat. Diesel engines
Publication taken from an online resource (Mercedesman.ru)
1 — Bolt M6x28, 14 Nm; 2 - Pulley; 3 - Ventilation hose; 4 — Coolant pump; 5 - Sealing gasket; 6 — Impeller; 7 — Seal; 8 — Gasket; 9 — Bolt M6x25, 9Nm; 10 — Sealing ring; 11 — Temperature sensor sensing element; 12 — Clamp; 13 — Thermostat housing, thermostat (+92°C) built-in; 14 — Connecting element, between the thermostat housing and the distribution mechanism housing
Only the differences from the petrol engine are described.
1. Disconnect the temperature sensor sensitive element connector (14).
2. Disconnect the fuel line holder from the thermostat housing.
3. Disconnect the coolant hoses and ventilation hose (1) at the thermostat housing (1).
4. Unscrew the thermostat housing (12). Tightening torque 9 Nm.