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Cylinder Block: Removal

  1. Remove the engine from the vehicle.

    Gasoline engine model: 

    Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>ENGINE ASSEMBLY>REMOVAL>GASOLINE ENGINE MODEL .

    Hybrid model: 

    Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>ENGINE ASSEMBLY>REMOVAL>HYBRID MODEL .

  2. Remove the crankshaft position sensor plate with drive plate. (Gasoline engine CVT model) Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>DRIVE PLATE>REMOVAL .
  3. Remove the crankshaft position sensor plate with flywheel. (MT model and hybrid model)

    MT model: 

    Ref. to CLUTCH SYSTEM>FLYWHEEL>REMOVAL .

    Hybrid model: 

    Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TH2A)>FLYWHEEL>REMOVAL .

  4. Remove the cylinder head. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CYLINDER HEAD>REMOVAL .
  5. Remove the oil pan upper. Ref. to LUBRICATION (H4DO (EXCEPT FOR HEV))>OIL PAN>REMOVAL>OIL PAN UPPER .
  6. Remove the crank sprocket. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CRANK SPROCKET>REMOVAL .
  7. Remove the water tank pipe assembly.

    2.0 L gasoline engine model: 

    Ref. to COOLING (H4DO (EXCEPT FOR HEV))>WATER PIPE>REMOVAL>WATER TANK PIPE ASSY>2.0 L MODEL .

    2.5 L model: 

    Ref. to COOLING (H4DO (EXCEPT FOR HEV))>WATER PIPE>REMOVAL>WATER TANK PIPE ASSY>2.5 L MODEL .

    Hybrid model: 

    Ref. to COOLING (H4DO(HEV))>WATER PIPE>REMOVAL>WATER TANK PIPE ASSEMBLY .

  8. Remove the PVC connector.

    Gasoline engine model: 

    Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PCV CONNECTOR>REMOVAL .

    Hybrid model: 

    Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO(HEV))>PCV CONNECTOR>REMOVAL .

  9. Remove the knock sensor.

    Gasoline engine model: 

    Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>KNOCK SENSOR>REMOVAL .

    Hybrid model: 

    Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO(HEV))>KNOCK SENSOR>REMOVAL .

  10. Remove the PCV valve.

    Gasoline engine model: 

    Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PCV VALVE>REMOVAL .

    Hybrid model: 

    Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO(HEV))>PCV VALVE>REMOVAL .

  11. Remove the engine rear hanger from cylinder block RH.
    G11253440Courtesy of SUBARU OF AMERICA, INC.
  12. Remove the bolts securing the crankshaft position sensor holder from the cylinder block LH, and remove the crankshaft position sensor with crankshaft position sensor holder.
    G11253441Courtesy of SUBARU OF AMERICA, INC.
  13. Set the part so that the cylinder block RH is on the upper side.
  14. Remove the #1 and #3 connecting rod caps and pistons from the cylinder block.
    NOTE: Mark each connecting rod cap and piston with a cylinder number.
    1. Using the ST, turn the crankshaft so that the #1 connecting rod cap (A) is located at the position shown in the figure.

      Preparation tool: 

      ST: CRANKSHAFT SOCKET (18252AA000)

      G11253442Courtesy of SUBARU OF AMERICA, INC.
    2. Using the ST, loosen the #1 connecting rod cap bolt, and remove the #1 connecting rod cap bolt and #1 connecting rod cap.

      Preparation tool: 

      ST: SOCKET (18270AA020)

      G11253443Courtesy of SUBARU OF AMERICA, INC.
    3. Using the ST, turn the crankshaft counterclockwise and separate the positions of the #1 pin (A) of crankshaft and the large end (B) of #1 connecting rod.

      Preparation tool: 

      ST: CRANKSHAFT SOCKET (18252AA000)

      G11253444Courtesy of SUBARU OF AMERICA, INC.
    4. Push the #1 connecting rod in the direction of the arrow, and remove the #1 piston with #1 connecting rod from the cylinder block.
      G11253445Courtesy of SUBARU OF AMERICA, INC.
    5. Using the ST, turn the crankshaft so that the #3 connecting rod cap (A) is located at the position shown in the figure.

      Preparation tool: 

      ST: CRANKSHAFT SOCKET (18252AA000)

      G11253446Courtesy of SUBARU OF AMERICA, INC.
    6. Using the ST, loosen the #3 connecting rod cap bolt, and remove the #3 connecting rod cap bolt and #3 connecting rod cap.

      Preparation tool: 

      ST: SOCKET (18270AA020)

      G11253447Courtesy of SUBARU OF AMERICA, INC.
    7. Using the ST, turn the crankshaft counterclockwise and separate the positions of the #3 pin (A) of crankshaft and the large end (B) of #3 connecting rod.

      Preparation tool: 

      ST: CRANKSHAFT SOCKET (18252AA000)

      G11253448Courtesy of SUBARU OF AMERICA, INC.
    8. Push the #3 connecting rod in the direction of the arrow, and remove the #3 piston with #3 connecting rod from the cylinder block.
      G11253449Courtesy of SUBARU OF AMERICA, INC.
  15. Set the part so that the cylinder block LH is on the upper side.
  16. Remove #2 and #4 connecting rod caps and pistons in the same removal procedure as #1 and #3 connecting rod caps and pistons.
  17. Set the part so that the cylinder block RH is on the upper side, and separate the cylinder block.
    1. Remove the engine stand from the cylinder block RH.
      G11253450Courtesy of SUBARU OF AMERICA, INC.
    2. Remove the bolt shown in the figure.
      G11253451Courtesy of SUBARU OF AMERICA, INC.
    3. Loosen the cylinder block mounting bolts in numerical order as shown in the figure, and then remove the bolts.
      Fig 1: Cylinder Block Mounting Bolts Loosening Sequence
      G11253452Courtesy of SUBARU OF AMERICA, INC.
    4. While tapping the cylinder block RH with a plastic hammer, separate the cylinder block RH from the cylinder block LH.
      NOTE: Lift the cylinder block RH gradually, and confirm that the crankshaft is remaining in the cylinder block LH. Lifting the cylinder block RH carelessly may cause the crankshaft to fall off.
  18. Remove the crankshaft from cylinder block LH, and remove the rear oil seal.
  19. Remove the O-ring from the cylinder block LH.
    G11253453Courtesy of SUBARU OF AMERICA, INC.
  20. Remove the crankshaft bearings from the cylinder block.
    NOTE:
    • Be careful not to confuse the crankshaft bearing combination.
    • Press the bearing at the end opposite to locking lip (A).
    G11253454Courtesy of SUBARU OF AMERICA, INC.
  21. Remove the liquid gasket from cylinder block.
  22. Remove the cylinder block LH from the engine stand.
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