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Engine Cooling System (H4SO) (Except Sti): Adjustments Subaru Impreza GH

Cooling System (Mechanical) 9 illustrations ~600 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)

SUBARU SUPER COOLANT CONCENTRATION REFERENCE

Engine coolant and diluting water

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

Scheme 38

Scheme 38: REMOVAL
Scheme 38: REMOVAL

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40
  1. Remove the radiator. Refer to «REMOVAL»(ref-357238-S29640236332010031100000) , Radiator .
  2. Remove the V-belts. Refer to «REMOVAL»(ref-357236-S14836131932010031100000) , V-belt .
  3. Remove the crank pulley. Refer to «REMOVAL»(ref-357236-S03660225752010031100000) , Crank Pulley .
  4. Remove the timing belt cover. Refer to «REMOVAL»(ref-357236-S36954403142010031100000) , Timing Belt Cover .
  5. Remove the timing belt. Refer to «TIMING BELT»(ref-357236-S36667470972010031100000) , REMOVAL, Timing Belt .
  6. Remove the automatic belt tension adjuster.
  7. Remove the camshaft position sensor. Refer to «REMOVAL»(ref-357240-S41687852642010031100000) , Camshaft Position Sensor .
  8. Remove the cam sprocket LH. Refer to «REMOVAL»(ref-357236-S28550982012010031100000) , Cam Sprocket .
  9. Remove the belt cover LH No. 2.
  10. Remove the tensioner bracket.
  11. Disconnect the hose from water pump.
  12. Remove the water pump.

Scheme 41

Scheme 41
Scheme 41

Scheme 42

Scheme 42: INSTALLATION
Scheme 42: 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-357236-S00130281272010031100000) , Cam Sprocket .
  6. Install the camshaft position sensor. Refer to «INSTALLATION»(ref-357240-S21827258342010031100000) , Camshaft Position Sensor .
  7. Install an automatic belt tension adjuster with the tension rod held by a pin. Refer to «AUTOMATIC BELT TENSION ADJUSTER ASSEMBLY AND BELT IDLER»(ref-357236-S21711184462010031100000) , INSTALLATION, Timing Belt .
  8. Install the timing belt. Refer to «TIMING BELT»(ref-357236-S38610243212010031100000) , INSTALLATION, Timing Belt .
  9. Install the timing belt cover. Refer to «INSTALLATION»(ref-357236-S22753045842010031100000) , Timing Belt Cover .
  10. Install the crank pulley. Refer to «INSTALLATION»(ref-357236-S42124623352010031100000) , Crank Pulley .
  11. Install the V-belts. Refer to «INSTALLATION»(ref-357236-S01465658632010031100000) , V-belt .
  12. Install the radiator. Refer to «INSTALLATION»(ref-357238-S34746890002010031100000) , Radiator .

Scheme 43

Scheme 43: INSPECTION
Scheme 43: 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 - 0.060 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 44

Scheme 44: REMOVAL
Scheme 44: REMOVAL
  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-357238-S07262314672010031100000) , REPLACEMENT, Engine Coolant .
  5. Remove the front exhaust pipe. Refer to «REMOVAL»(ref-357254-S15303422132010031100000) , Front Exhaust Pipe .
  6. Disconnect the radiator outlet hose from thermostat cover.
  7. Remove the thermostat cover, and then remove the gasket and thermostat.

Scheme 45

Scheme 45
Scheme 45

Scheme 46

Scheme 46: INSTALLATION
Scheme 46: INSTALLATION
  1. Install a gasket to thermostat. NOTE: Use a new gasket.
  2. Install the thermostat and thermostat cover. NOTE: Install 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 front exhaust pipe. Refer to «INSTALLATION»(ref-357254-S20749004742010031100000) , Front Exhaust Pipe .
  5. Install the under cover.
  6. Lower the vehicle.
  7. Fill engine coolant. Refer to «FILLING OF ENGINE COOLANT»(ref-357238-S17669780692010031100000) , REPLACEMENT, Engine Coolant .

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