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Engine Cooling System (Sti): Adjustments Subaru Impreza GH

Cooling System (Mechanical) 9 illustrations ~568 words

PROCEDURE TO ADJUST THE CONCENTRATION OF THE SUBARU SUPER COOLANT

CAUTIONUse the Subaru Super Coolant with a 50-60% concentration in order to obtain maximum anti-freeze and anti-rust performance.

To adjust the concentration of Subaru Super Coolant according to temperature, select the proper Subaru Super Coolant concentration from the table, and add the amount of diluting water corresponding to the required concentration to the Subaru Super Coolant (concentrated type).

Relationship of Subaru Super Coolant concentration and freezing temperature
Subaru Super Coolant concentration50%55%60%
Freezing temp.36°C (-33°F)41°C (-42°F)50°C (-58°F)

TEMPERATURE CHART

Engine coolant and diluting water

Refer to SPECIFICATION for the recommended engine coolant and diluting water.

Scheme 3

Scheme 3: REMOVAL
Scheme 3: REMOVAL

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6
  1. Remove the radiator. Refer to «REMOVAL»(ref-357080-S24531260732010030800000) , Radiator.
  2. Remove the V-belts. Refer to «REMOVAL»(ref-357079-S26288262802010030800000) , V-belt.
  3. Remove the crank pulley. Refer to «REMOVAL»(ref-357079-S18693927572010030800000) , Crank Pulley.
  4. Remove the timing belt cover. Refer to «REMOVAL»(ref-357079-S23272020472010030800000) , Timing Belt Cover.
  5. Remove the timing belt. Refer to «REMOVAL»(ref-357079-S11805492022010030800000) , Timing Belt.
  6. Remove the automatic belt tension adjuster (A).
  7. Remove the belt idler (B).
  8. Remove the belt idler No. 2 (C).
  9. Remove the cam sprocket LH. Refer to «REMOVAL»(ref-357079-S13058735912010030800000) , Cam Sprocket.
  10. Remove the belt cover No. 2 LH.
  11. Remove the tensioner bracket.
  12. Disconnect the hose from water pump.
  13. Remove the water pump.

Scheme 7

Scheme 7: INSTALLATION
Scheme 7: INSTALLATION
  1. Install the water pump onto cylinder block LH. NOTE: Use a new gasket. When installing the water pump, tighten the bolts in two stages in alphabetical sequence as shown in figure. Tightening torque: First: 12 N.m (1.2 kgf-m, 8.9 ft-lb) Second: 12 N.m (1.2 kgf-m, 8.9 ft-lb)
  2. Install the hose to water pump.
  3. Install the tensioner bracket. Tightening torque: 24.5 N.m (2.5 kgf-m, 18.1 ft-lb)
  4. Install the belt cover No. 2 LH. Tightening torque: 5 N.m (0.5 kgf-m, 3.7 ft-lb)
  5. Install the cam sprocket LH. Refer to «INSTALLATION»(ref-357079-S22743396672010030800000) , Cam Sprocket.
  6. Install the belt idler No. 2 (C). Tightening torque: 39 N.m (4.0 kgf-m, 28.8 ft-lb)
  7. Install the belt idler (B). Tightening torque: 25 N.m (2.5 kgf-m, 18.4 ft-lb)
  8. Install the automatic belt tension adjuster (A) with the tension rod held by a pin. Refer to «AUTOMATIC BELT TENSION ADJUSTER ASSEMBLY AND BELT IDLER»(ref-357079-S38980459572010030800000) , INSTALLATION, Timing Belt.
  9. Install the timing belt. Refer to «TIMING BELT»(ref-357079-S11075278712010030800000) , INSTALLATION, Timing Belt.
  10. Install the timing belt cover. Refer to «INSTALLATION»(ref-357079-S12377285842010030800000) , Timing Belt Cover.
  11. Install the crank pulley. Refer to «INSTALLATION»(ref-357079-S32449958142010030800000) , Crank Pulley.
  12. Install the V-belts. Refer to «INSTALLATION»(ref-357079-S10185223112010030800000) , V-belt.
  13. Install the radiator. Refer to «INSTALLATION»(ref-357080-S12847411072010030800000) , Radiator.

Scheme 8

Scheme 8: INSPECTION
Scheme 8: INSPECTION
  1. Check the water pump bearing for smooth rotation.
  2. Check the water pump pulley for abnormalities.
  3. Make sure the impeller is not deformed or damaged.
  4. Inspect the clearance between impeller and pump case. Clearance between impeller and pump case: Standard 0.5 - 1.5 mm (0.020 - 0.059 in)
  5. After water pump installation, check pulley shaft for engine coolant leaks or noise. If leaks or noise are noted, replace the water pump assembly.

Scheme 9

Scheme 9: REMOVAL
Scheme 9: REMOVAL

Scheme 10

Scheme 10
Scheme 10
  1. Set the vehicle on a lift.
  2. Lift up the vehicle.
  3. Remove the under cover.
  4. Drain the engine coolant. Refer to «DRAINING OF ENGINE COOLANT»(ref-357080-S30342819572010030800000) , REPLACEMENT, Engine Coolant.
  5. Disconnect the radiator outlet hose from thermostat cover.
  6. Remove the thermostat cover, and then remove the gasket and thermostat.

Scheme 11

Scheme 11: INSTALLATION
Scheme 11: INSTALLATION
  1. Install a gasket to thermostat. NOTE: Use a new gasket.
  2. Install the thermostat and thermostat cover. NOTE: Install the parts with the jiggle pin facing upward. Tightening torque: 12 N.m (1.2 kgf-m, 8.9 ft-lb)
  3. Connect the radiator outlet hose to thermostat cover.
  4. Install the under cover.
  5. Lower the vehicle.
  6. Fill engine coolant. Refer to «FILLING OF ENGINE COOLANT»(ref-357080-S19402554772010030800000) , REPLACEMENT, Engine Coolant.

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