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

Cooling System (Mechanical) 9 illustrations ~574 words

PROCEDURE TO ADJUST THE SUBARU SUPER COOLANT CONCENTRATION

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

To adjust the concentration of SUBARU Super Coolant according to temperature, find the proper SUBARU Super Coolant concentration in the table, and add dilution water to the SUBARU Super Coolant (concentrated type) until it reaches the proper dilution.

Relationship of SUBARU Super Coolant concentration and freezing temperature
SUBARU Super Coolant concentration50%55%60%
Freezing temperature36°C (-33°F)41°C (-42°F)50°C (-58°F)

SUPER COOLANT CONCENTRATION REFERENCE

Engine coolant and diluting water

Refer to "SPECIFICATION" for recommended engine coolant and diluting water. Ref. to SPECIFICATION , General Description.

Scheme 72

Scheme 72: REMOVAL
Scheme 72: REMOVAL

Scheme 73

Scheme 73
Scheme 73

Scheme 74

Scheme 74
Scheme 74
  1. Remove the radiator. Ref. to «REMOVAL»(ref-357239-S26125994232010031100000) , Radiator.
  2. Remove the V-belts. Ref. to «REMOVAL»(ref-357237-S00077187882010031100000) , V-belt.
  3. Remove the crank pulley. Ref. to «REMOVAL»(ref-357237-S09849468212010031100000) , Crank Pulley.
  4. Remove the timing belt cover. Ref. to «REMOVAL»(ref-357237-S37379900212010031100000) , Timing Belt Cover.
  5. Remove the timing belt. Ref. to «REMOVAL»(ref-357237-S17824440692010031100000) , 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. Ref. to «REMOVAL»(ref-357237-S20441974372010031100000) , 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 75

Scheme 75
Scheme 75

Scheme 76

Scheme 76: INSTALLATION
Scheme 76: 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. Ref. to «INSTALLATION»(ref-357237-S32810246052010031100000) , 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. Ref. to «AUTOMATIC BELT TENSION ADJUSTER ASSEMBLY AND BELT IDLER»(ref-357237-S35839258042010031100000) , INSTALLATION, Timing Belt.
  9. Install the timing belt. Ref. to «TIMING BELT»(ref-357237-S08053995022010031100000) , INSTALLATION, Timing Belt.
  10. Install the timing belt cover. Ref. to «INSTALLATION»(ref-357237-S15927582922010031100000) , Timing Belt Cover.
  11. Install the crank pulley. Ref. to «INSTALLATION»(ref-357237-S23891213082010031100000) , Crank Pulley.
  12. Install the V-belts. Ref. to «INSTALLATION»(ref-357237-S10596823412010031100000) , V-belt.
  13. Install the radiator. Ref. to «INSTALLATION»(ref-357239-S29225592222010031100000) , Radiator.

Scheme 77

Scheme 77: INSPECTION
Scheme 77: 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 abnormally deformed or damaged.
  4. Inspect the clearance between impeller and pump case. Clearance between impeller and pump case: Specification 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 78

Scheme 78: REMOVAL
Scheme 78: REMOVAL
  1. Set the vehicle on a lift.
  2. Lift up the vehicle.
  3. Remove the under cover.
  4. Drain the engine coolant. Ref. to «DRAINING OF ENGINE COOLANT»(ref-357239-S42364927112010031100000) , 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 79

Scheme 79
Scheme 79

Scheme 80

Scheme 80: INSTALLATION
Scheme 80: 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. Ref. to «FILLING OF ENGINE COOLANT»(ref-357239-S07197404722010031100000) , REPLACEMENT, Engine Coolant.

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