Contents Wiring diagrams Section: Cooling System (Mechanical) All sections

Engine Cooling System (Sti): Specifications Subaru Impreza GH

Cooling System (Mechanical) 2 illustrations

SPECIFICATION

Cooling systemElectric fan + Forced engine coolant circulation system
Total engine coolant capacityL (US qt, lmp qt)Approx. 7.7 (8.1, 6.8)
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)

GENERAL SPECIFICATION

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 1

Scheme 1: WATER PUMP

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

T1: First 12 (12, 8.9)

Second 12 (1.2, 8.9)

T2: 12 (1.2, 8.9)

Scheme 2

Scheme 2: RADIATOR AND RADIATOR FAN

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

T1: 3.4 (0.3, 2.5)

T2: 4.41 (0.45, 3.25)

T3: 7.5 (0.8, 5.5)

T4: 12 (1.2, 8.9)