Subaru Legacy/Outback

1999-2003 of release

Repair and operation of the car

Subaru of Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling systems, heating
   - Engine cooling system
      Antifreeze - general information
      Detachment and replacement of hoses of the cooling system
      Service of the cooling system (depletion, washing and filling)
      Details of installation and principle of functioning of fans of the cooling system
      The water pump - the general information
      Check of serviceability of functioning and replacement of the thermostat
      Check of serviceability of functioning, removal, service and installation of fans of the cooling system
      Service, removal and installation of a radiator of the cooling system
      Check of a condition of a cover of a radiator
      Removal and installation of a broad tank
      Removal, check and installation of the water pump
   + Systems of heating/ventilation/air conditioning
+ Power supply system and release
+ Electric equipment of the engine
+ Manual box and differential
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


The water pump - the general information

Pump assembly of the 4-cylinder engine

1 — the Driving pulley
2 — the Ball bearing
3 — the Epiploon
4 — the Rotor
5 — the Thermostat

6 — a thermostat Casing
And — the Entrance of the truncated contour (the thermostat is closed)
In — the Entrance of a full contour (the thermostat is open)

Pump assembly of the 6-cylinder engine

1 — the Case of pump assembly
2 — the Ball bearing
3 — Sealing knot

4 — the Rotor
5 — the Sealing ring

Design of the sealing knot providing tightness of assembly of the water pump

1 — the Coal epiploon
2 — the Ceramic saddle

3 — a rotor Shaft

The design of the water pumps used on the cars considered in the present manual is shown on illustrations.

On 4-cylinder engines (l models 2.0 and 2.5) the water pump is installed in forward part of the left semi-block of cylinders and is put in action by a gas-distributing belt. In an inlet branch pipe in the lower part of pump assembly the thermostat is built in. At rotation of rotors of the pump cooling liquid is soaked up in a working chamber through the lower tube connected to a radiator hose, passing thus through the thermostat. Further, moving on rotor perimeter, it is pushed out in a working contour of the cooling system which configuration is defined by position of the valve of the thermostat.

On 6-cylinder engines (model of 3.0 l) the water pump is placed in the casing created by a back cover of the GRM drive. As a sealing element between a pump housing and a casing the rubber ring is established. The drive of the pump is carried out from a gas-distributing chain. Rotation of a rotor in a volume chamber of the pump provides supply of liquid in a contour of a cooling path of the engine. The pump housing is made of aluminum by a molding method under pressure, a rotor - of sheet steel. The shaft of a rotor is fixed in two bearings (ball and roller) and condensed from the oil party by means of an epiploon. The volume chamber is created by deepenings in a back cover of the GRM drive and the top section of the pallet of a case. Between a cover and the pallet metal sealing laying is established.

For consolidation of both pump assemblies from cooling liquid the mechanical sealing knot consisting of the ceramic saddle which is densely put on a shaft of a rotor and a coal epiploon is used. The knot is built in pump assembly and to service in an individual order is not subject.