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Engine Cooling System (H4DOTC) (Except Sti): Specifications Subaru Impreza GH

Cooling System (Mechanical) 2 illustrations ~235 words

SPECIFICATION

Cooling systemElectric fan + Forced engine coolant circulation system
Total engine coolant capacityL (US qt, lmp qt)AT model: Approx. 7.4 (7.8, 6.5)
MT model: Approx. 7.5 (7.9, 6.6)
Water pumpTypeCentrifugal impeller type
Discharge performance IDischarge rateL (US gal, lmp gal)/min.20 (5.3, 4.4)
Pump speed - Discharge pressure760 RPM - 2.9 kPa (0.3 mAq)
Engine coolant temperature80°C (176°F)
Discharge performance IIDischarge rateL (US gal, lmp gal)/min.100 (26.4, 22.0)
Pump speed - Discharge pressure3,000 RPM - 49.0 kPa (5.0 mAq)
Engine coolant temperature80°C (176°F)
Discharge performance IIIDischarge rateL (US gal, lmp gal)/min.200 (52.8, 44.0)
Pump speed - Discharge pressure6,000 RPM - 225.4 kPa (23.0 mAq)
Engine coolant temperature80°C (176°F)
Impeller diameterMm (in)76 (2.99)
Number of impeller vanes8
Pump pulley diameterMm (in)60 (2.36)
Clearance between impeller and caseStandardMm (in)0.5 - 1.5 (0.020 - 0.059)
ThermostatTypeWax pellet type
Starting temperature to open76 - 80°C (169 - 176°F)
Fully opens91 °C (196°F)
Valve liftMm (in)9.0 (0.354) or more
Valve boreMm (in)35 (1.38)
Radiator fanMotor inputMain fanW120
Sub fanW120
Fan diameter/BladeMain fan318.5 mm (12.54 in)/9
Sub fan318.5 mm (12.54 in)/11
RadiatorTypeDown flow
Core dimensionsWidth x Height x ThicknessMm (in)687.4 x 340 x 16 (27.06 x 13.39 x 0.63)
Pressure range in which cap valve is openCoolant filler tank sideKPa (kg/cm 2 , psi)Above: 108±14.7 (1.1 ± 0.15,16±2.1)
Below: -1.0 - -4.9 (-0.01 - -0.05, -0.1 - -0.7)
Radiator sideKPa (kg/cm 2 , psi)Above only: 137±14.7 (1.40±0.15, 20±2.1)
FinsCorrugated fin type
Reservoir tankCapacityL (US qt, lmp qt)0.45 (0.48, 0.40)

SPECIFICATION CHART

Recommended materialsItem numberAlternative
CoolantSUBARU SUPER COOLANT (Concentrated type)
SUBARU SUPER COOLANT (Diluted type)K0670Y0000
Water for dilutionDistilled waterSoft water or tap water
Cooling system protective agentCooling system conditionerSOA345001

COOLANT SPECIFICATION

Scheme 70

Scheme 70: WATER PUMP

Tightening torque: N.m (kgf-m, ft-lb)

T1: First 12 (1.2, 8.9)

Second 12 (1.2, 8.9)

T2: 12 (1.2, 8.9)

Scheme 71

Scheme 71: RADIATOR AND RADIATOR FAN

Tightening torque: N.m (kgf-m, ft-lb)

T1: 3 (0.3, 2.2)

T2: 3.4 (0.3, 2.5)

T3: 4.41 (0.45, 3.25)

T4: 7.5 (0.8, 5.5)

T5: 12 (1.2, 8.9)

C: CAUTION

  1. Wear appropriate work clothing, including a cap, protective goggles and protective shoes when performing any work.
  2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
  3. Keep the disassembled parts in order and protect them from dust and dirt.
  4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly and replacement.
  5. Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.
  6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
  7. Place shop jacks or rigid racks at the specified points.
  8. Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.
  9. Prepare a container and cloth to prevent scattering of engine coolant when performing work where engine coolant can be spilled. If the oil spills, wipe it off immediately to prevent from penetrating into floor or flowing out for environmental protection.
  10. Follow all government and local regulations concerning disposal of refuse when disposing engine coolant.