Home ReviewsRefund
Home/Subaru/Outback/Subaru Outback BH (1999-2003)/Repair manual/Cooling System (Mechanical)/Engine Cooling System (2.5L): Adjustments
Contents Wiring diagrams Section: Cooling System (Mechanical) All sections

Engine Cooling System (2.5L): Adjustments Subaru Outback BH

Cooling System (Mechanical) 39 illustrations ~1064 words

PROCEDURE TO ADJUST THE CONCENTRATION OF THE COOLANT

To adjust the concentration of the coolant according to temperature, find the proper fluid concentration in the above diagram and replace the necessary amount of coolant with an undiluted solution of SUBARU genuine coolant (concentration 50). The amount of coolant that should be replaced can be determined using the diagram.

[Example]

Assume that the coolant concentration must be increased form 25% to 40%. Find point A, where the 25% line of coolant concentration intersects with the 40% curve of the necessary coolant concentration, and read the scale on the vertical axis of the graph at height A. The quantity of coolant to be drained is 2.1 liters (2.2 US qt, 1.8 Imp qt). Drain 2.1 liters (2.2 US qt, 1.8 Imp qt) of coolant from the cooling system and add 2.1 liters (2.2 US qt, 1.8 Imp qt) of the undiluted solution of SUBARU coolant.

If a coolant concentration of 50% is needed, drain all the coolant and refill with the undiluted solution only.

Adjusting Coolant Concentration Graph. Scheme 11

Scheme 11: Adjusting Coolant Concentration Graph
Scheme 11: Adjusting Coolant Concentration Graph

Scheme 12

Scheme 12: REMOVAL
Scheme 12: REMOVAL

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17

Scheme 18

Scheme 18
Scheme 18

Scheme 19

Scheme 19
Scheme 19

Scheme 20

Scheme 20
Scheme 20

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22

Scheme 23

Scheme 23
Scheme 23

Scheme 24

Scheme 24
Scheme 24

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27
  1. Disconnect ground cable from the battery. (Scheme 12): Disconnecting Ground Cable From Battery
  2. Lift-up the vehicle.
  3. Remove under cover. (Scheme 13): Removing Under Cover
  4. Drain engine coolant completely. See «DRAINING OF ENGINE COOLANT»(ref-178723-S41389615812005063000000), REPLACEMENT, Engine Coolant. (Scheme 14): Draining Engine Coolant
  5. Disconnect connectors from radiator main fan (A) and sub fan (B) motors. (Scheme 15): Disconnecting Connectors From Radiator Main Fan & Sub Fan
  6. Disconnect radiator outlet hose and heater hose from water pump. (Scheme 16): Disconnecting Radiator Outlet Hose & Heater Hose
  7. Lower the vehicle.
  8. Remove air intake duct. (Scheme 17): Removing Air Intake Duct
  9. Disconnect over flow hose. (Scheme 18): Disconnecting Over Flow Hose
  10. Remove reservoir tank. (Scheme 19): Removing Reservoir Tank
  11. Remove radiator main fan and sub fan assemblies. See «REMOVAL & INSTALLATION»(ref-168242-S11395572292004110300000), Radiator Main Fan and Fan Motor and «REMOVAL & INSTALLATION»(ref-168242-S07541449142004110300000), Radiator Sub Fan and Fan Motor. (Scheme 20): Removing Radiator Main Fan & Sub Fan Assemblies
  12. Remove V-belts. See «DRIVE BELTS»(ref-149713-S30946921752002102200000), V-belt. (Scheme 21): Removing V-Belts
  13. Remove timing belt. See «REMOVAL»(ref-138363-S33090786432002040800000), Timing Belt Assembly.
  14. Remove automatic belt tension adjuster. (Scheme 22): Removing Automatic Belt Tension Adjuster
  15. Remove belt idler No. 2. (Scheme 23): Removing Belt Idler No. 2
  16. Remove left-hand camshaft sprocket by using ST. ST 499207100 CAMSHAFT SPROCKET WRENCH (Scheme 24): Removing Left-Hand Camshaft Sprocket Using ST
  17. Remove left-hand belt cover No. 2. (Scheme 25): Removing Left-Hand Belt Cover No. 2
  18. Remove tensioner bracket. (Scheme 26): Removing Tensioner Bracket
  19. Disconnect heater hose from water pump.
  20. Remove water pump. (Scheme 27): Removing Water Pump

Scheme 28

Scheme 28: INSTALLATION
Scheme 28: INSTALLATION

Scheme 29

Scheme 29
Scheme 29

Scheme 30

Scheme 30
Scheme 30

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40

Scheme 41

Scheme 41
Scheme 41

Scheme 42

Scheme 42
Scheme 42
  1. Install water pump onto left-hand cylinder head. CAUTION: Replace gasket with a new one. When installing water pump, tighten bolts in two stages in alphabetical sequence as shown in figure. Tightening torque: First: 12 N.m (1.2 kgf-m, 8.7 ft-lb) Second: 12 N.m (1.2 kgf-m, 8.7 ft-lb) (Scheme 28): Identifying Water Pump Tightening Sequence
  2. Install left-hand belt cover No. 2. Tightening torque: 5 N.m (0.5 kgf-m, 3.6 ft-lb) (Scheme 29): Installing Left-Hand Belt Cover No. 2
  3. Install tensioner bracket. Tightening torque: 25 N.m (2.5 kgf-m, 18.1 ft-lb) (Scheme 30): Installing Tensioner Bracket
  4. Install left-hand camshaft sprockets by using ST. ST 4992707100 CAMSHAFT SPROCKET WRENCH Tightening torque: 78 N.m (8.0 kgf-m, 57.9 ft-lb) (Scheme 31): Installing Left-Hand Camshaft Sprockets Using ST
  5. Install belt idler No. 2. Tightening torque: 39 N.m (4.0 kgf-m, 28.9 ft-lb) (Scheme 32): Installing Belt Idler No. 2
  6. Install automatic belt tension adjuster which tension rod is held with pin. See TIMING BELT ASSEMBLY in appropriate ENGINE MECHANICAL article. (Scheme 33): Installing Automatic Belt Tension Adjuster
  7. Install timing belt. See See TIMING BELT ASSEMBLY in appropriate ENGINE MECHANICAL article.
  8. Install V-belts. See «DRIVE BELTS»(ref-149713-S30946921752002102200000), V-belt. (Scheme 34): Installing V-Belts
  9. Install radiator main fan and sub fan motor assemblies. See «REMOVAL & INSTALLATION»(ref-168242-S11395572292004110300000), Radiator Main Fan and Fan Motor and «REMOVAL & INSTALLATION»(ref-168242-S07541449142004110300000), Radiator Sub Fan and Fan Motor. (Scheme 35): Installing Radiator Fan Assemblies
  10. Install reservoir tank. (Scheme 36): Installing Reservoir Tank
  11. Connect over flow hose. (Scheme 37): Connecting Over Flow Hose
  12. Install air intake duct. (Scheme 38): Installing Air Intake Duct
  13. Lift-up the vehicle.
  14. Connect radiator outlet hose and heater hose to water pump. (Scheme 39): Connecting Radiator Outlet Hose & Heater Hose
  15. Connect connectors to radiator main fan (A) and sub fan (B) motors. (Scheme 40): Connecting Connectors To Radiator Main Fan & Sub Fan
  16. Install under cover. (Scheme 41): Installing Under Cover
  17. Lower the vehicle.
  18. Connect battery ground cable. (Scheme 42): Connecting Battery Ground Cable
  19. Fill coolant. See «FILLING OF ENGINE COOLANT»(ref-178723-S29728760692005063000000), REPLACEMENT, Engine Coolant.

Scheme 43

Scheme 43: INSPECTION
Scheme 43: INSPECTION

Scheme 44

Scheme 44
Scheme 44
  1. Check water pump bearing for smooth rotation.
  2. Check water pump pulley for abnormalities.
  3. Using a dial gauge, measure impeller runout in thrust direction while rotating the pulley. "Thrust" runout limit: 0.5 mm (0.020 in) (Scheme 43): Measuring Impeller Runout
  4. Check clearance between impeller and pump case. Clearance between impeller and pump case: Standard: 0.5 - 0.7 mm (0.020 - 0.028 in) Limit: 1.0 mm (0.039 in) (Scheme 44): Checking Clearance Between Impeller & Pump Case
  5. After water pump installation, check pulley shaft for engine coolant leaks. If leaks are noted, replace water pump assembly.

Scheme 45

Scheme 45: REMOVAL
Scheme 45: REMOVAL

Scheme 46

Scheme 46
Scheme 46

Scheme 47

Scheme 47
Scheme 47

Scheme 48

Scheme 48
Scheme 48
  1. Lift-up the vehicle.
  2. Remove under cover. (Scheme 45): Removing Under Cover
  3. Drain engine coolant completely. See «DRAINING OF ENGINE COOLANT»(ref-178723-S41389615812005063000000), REPLACEMENT, Engine Coolant. (Scheme 46): Draining Engine Coolant
  4. Disconnect radiator outlet hose from thermostat cover. (Scheme 47): Disconnecting Radiator Outlet Hose From Thermostat Cover
  5. Remove thermostat cover and gasket, and pull out the thermostat. (Scheme 48): Removing Thermostat Cover

Scheme 49

Scheme 49: INSTALLATION
Scheme 49: INSTALLATION
  1. Install the thermostat in the water pump, and install the thermostat cover together with a gasket. CAUTION: When reinstalling the thermostat, use a new gasket. The thermostat must be installed with the jiggle pin (A) facing to front side. At this time, set the jiggle pin of thermostat for front side. Tightening torque: 6.4 N.m (0.65 kgf-m, 4.7 ft-lb) (Scheme 49): Installing Thermostat
  2. Fill coolant. See «FILLING OF ENGINE COOLANT»(ref-178723-S29728760692005063000000), REPLACEMENT, Engine Coolant.

More articles — Engine Cooling System (2.5L)