LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical (STI)) >> Cylinder Block >> Installation

Cylinder Block: Installation

WARNING: This page is about a different variant/trim than selected.
G12437910Courtesy of SUBARU OF AMERICA, INC.
  1. Remove oil on the mating surface of cylinder block before installation. Apply a coat of engine oil to the bearing and crankshaft journal.
  2. Position the crankshaft and O-ring on cylinder block RH.
    NOTE: Use new O-rings.
  3. Apply liquid gasket to the mating surfaces of cylinder block RH, and position cylinder block LH.
    NOTE:
    • Install within 5 min. after applying liquid gasket.
    • Do not allow liquid gasket to jut into O-ring grooves, oil passages, bearing grooves, etc.

    Liquid gasket:

    THREE BOND 1217G (Part No. K0877Y0100), THREE BOND 1217H or equivalent

    G04997735Courtesy of SUBARU OF AMERICA, INC.
  4. Apply a coat of engine oil to the washer and bolt thread.
    NOTE: Use a new seal washer.
  5. Tighten the 10 mm cylinder block connecting bolts on the LH side (A - D) in alphabetical order.

    Tightening Torque:

    10 N.m (1.0 kgf-m, 7.4 ft-lb)

    Fig 1: Cylinder Block Connecting Bolts (Tightening Sequence) (LH Side)
    G04998756Courtesy of SUBARU OF AMERICA, INC.
  6. Tighten the 10 mm cylinder block connecting bolts on the RH side (E - J) in alphabetical order.

    Tightening Torque:

    10 N.m (1.0 kgf-m, 7.4 ft-lb)

    Fig 2: Cylinder Block Connecting Bolts (Tightening Sequence) (RH Side)
    G04998757Courtesy of SUBARU OF AMERICA, INC.
  7. Tighten the LH side cylinder block connecting bolts (A - D) further in alphabetical order.

    Tightening Torque:

    18 N.m (1.8 kgf-m, 13.3 ft-lb)

    Fig 3: LH Side Cylinder Block Connecting Bolts (Tightening Sequence)
    G04998756Courtesy of SUBARU OF AMERICA, INC.
  8. Tighten the RH side cylinder block connecting bolts (E - J) further in alphabetical order.

    Tightening Torque:

    18 N.m (1.8 kgf-m, 13.3 ft-lb)

    Fig 4: RH Side Cylinder Block Connecting Bolts (Tightening Sequence)
    G04998757Courtesy of SUBARU OF AMERICA, INC.
  9. Tighten the LH side cylinder block connecting bolts (A - D) further in alphabetical order.
    • (A), (C): Angle tightening

      Tightening angle:

      90°

    • (B), (D): Torque tightening

      Tightening Torque:

      40 N.m (4.1 kgf-m, 29.5 ft-lb)

    Fig 5: LH Side Cylinder Block Connecting Bolts (Tightening Sequence)
    G04998756Courtesy of SUBARU OF AMERICA, INC.
  10. Tighten the RH side cylinder block connecting bolts (E - J) further in alphabetical order.

    Tightening angle:

    90°

    Fig 6: RH Side Cylinder Block Connecting Bolts (Tightening Sequence)
    G04998757Courtesy of SUBARU OF AMERICA, INC.
  11. Tighten the 8 mm and 6 mm cylinder block connecting bolts on the LH side (A - H) in alphabetical order.

    Tightening Torque:

    (A) - (G): 25 N.m (2.5 kgf-m, 18.4 ft-lb)

    (H): 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

    Fig 7: LH Side Cylinder Block Connecting Bolts (Tightening Sequence)
    G04997742Courtesy of SUBARU OF AMERICA, INC.
  12. Apply a coat of engine oil to the oil seal inner periphery and outer periphery, and install the rear oil seal using ST1 and ST2.
    NOTE: Use a new rear oil seal.

    ST1 499597100

    CRANKSHAFT OIL SEAL GUIDE

    ST2 499587200

    CRANKSHAFT OIL SEAL INSTALLER

    G12437919Courtesy of SUBARU OF AMERICA, INC.
  13. Position the top ring gap at (A) or (B) in the figure.
  14. Position the second ring gap at 180° on the reverse side the top ring gap.
    • Except for TYPE RA
      G07912067Courtesy of SUBARU OF AMERICA, INC.
    • TYPE RA
      G12437921Courtesy of SUBARU OF AMERICA, INC.
  15. Position the upper rail gap at (C) in the figure.
    • Except for TYPE RA
      G07912068Courtesy of SUBARU OF AMERICA, INC.
    • TYPE RA
      G12437923Courtesy of SUBARU OF AMERICA, INC.
  16. Align the upper rail spin stopper (E) to the side hole (D) on the piston.
    G04998766Courtesy of SUBARU OF AMERICA, INC.
  17. Position the expander gap at (F) in the figure on the 180° opposite direction of (C).
    • Except for TYPE RA
      G07912070Courtesy of SUBARU OF AMERICA, INC.
    • TYPE RA
      G12437926Courtesy of SUBARU OF AMERICA, INC.
  18. Set the lower rail gap at position (G), located 120° clockwise from (C) in the figure.
    • Except for TYPE RA
      G07912071Courtesy of SUBARU OF AMERICA, INC.
    • TYPE RA
      G12437928Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • Make sure ring gaps do not face the same direction.
    • Make sure ring gaps are not within the piston skirt area.
  19. Install the snap ring.

    Before positioning the piston on the cylinder block, attach the snap ring in the service hole of the cylinder block, and the piston hole on the opposite side.

    NOTE: Use new snap rings.
    G12437929Courtesy of SUBARU OF AMERICA, INC.
    Fig 8: Cylinder Block Components (With Torque Specification)
    G12437930Courtesy of SUBARU OF AMERICA, INC.

    Tightening Torque: N.m (kgf-m, ft-lb) 

    T: 70 (7.1, 51.6) 

  20. Install the piston.
    1. Set the parts so that the #1 and #2 cylinders are on the upper side.
    2. Using the ST1, turn the crankshaft so that #1 and #2 connecting rods are set at bottom dead center.

      ST1 499987500

      CRANKSHAFT SOCKET

    3. Apply a coat of engine oil to the pistons and cylinders and insert pistons in their cylinders using ST2.

      ST2 498747300

      PISTON GUIDE

    G04997752Courtesy of SUBARU OF AMERICA, INC.
    NOTE: Face the piston front mark towards the front of the engine.
    • Except for TYPE RA
      G12437932Courtesy of SUBARU OF AMERICA, INC.
    • TYPE RA
      G12437933Courtesy of SUBARU OF AMERICA, INC.
  21. Install the piston pin.
    1. Apply a coat of engine oil to ST3.
    2. Insert ST3 into the service hole to align the piston pin hole and the connecting rod small end.

      ST3 499017100

      PISTON PIN GUIDE

      G04997753Courtesy of SUBARU OF AMERICA, INC.
    3. Apply a thin coat of engine oil to piston pin, and insert the piston pin into piston and connecting rod through service hole.
    4. Install the snap ring.
      NOTE: Use new snap rings.
      G04997754Courtesy of SUBARU OF AMERICA, INC.
    5. Apply liquid gasket to the threaded portion of the service hole plug.

      Liquid gasket:

      THREE BOND 1105 (Part No. 004403010) or equivalent

      G04997755Courtesy of SUBARU OF AMERICA, INC.
    6. Install the service hole plug and gasket.
      NOTE: Use a new gasket.

      Tightening Torque:

      70 N.m (7.1 kgf-m, 51.6 ft-lb)

      G04997730Courtesy of SUBARU OF AMERICA, INC.
      Fig 9: Cylinder Block Components (With Torque Specification)
      G12437938Courtesy of SUBARU OF AMERICA, INC.

      Tightening Torque: N.m (kgf-m, ft-lb) 

      T1: 6.4 (0.7, 4.7) 

      T2: 70 (7.1, 51.6) 

    7. Set the parts so that the #3 and #4 cylinders are on the upper side. Following the same procedures as used for #1 and #2 cylinders, install the pistons and piston pins.
    8. Install the service hole cover.
      NOTE: Use new O-rings.

      Tightening Torque:

      6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

  22. Install the water pipe assembly along with the water tank pipe assembly to the cylinder block RH, and install the clamp using the Clamp pincer (14100134).
    NOTE: Use new O-rings and clamps.
    G11571825Courtesy of SUBARU OF AMERICA, INC.

    Tightening Torque:

    6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

  23. Install the baffle plate.

    Tightening Torque:

    6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

  24. Install the oil strainer.
    NOTE: Use new O-rings.

    Tightening Torque:

    10 N.m (1.0 kgf-m, 7.4 ft-lb)

  25. Tighten the oil strainer stay together with the baffle plate.

    Tightening Torque:

    6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

  26. Apply liquid gasket to the mating surfaces of oil pan, and install the oil pan.
    NOTE: Install within 5 min. after applying liquid gasket.

    Liquid gasket:

    THREE BOND 1217G (Part No. K0877Y0100), THREE BOND 1217H or equivalent

    Tightening Torque:

    5 N.m (0.5 kgf-m, 3.7 ft-lb)

    G12437940Courtesy of SUBARU OF AMERICA, INC.
  27. Apply liquid gasket to the mating surface of oil separator cover and the threaded portion of bolt (A) shown in the figure (when reusing the bolt), and then install the oil separator cover.
    NOTE:
    • Install within 5 min. after applying liquid gasket.
    • Use new oil separator cover.

    Liquid gasket:

    Mating surface

    THREE BOND 1217G (Part No. K0877Y0100), THREE BOND 1217H or equivalent

    Bolt thread (A) (when reusing the bolt)

    THREE BOND 1324 (Part No. 004403042) or equivalent

    Tightening Torque:

    6.4 N.m (0.65 kgf-m, 4.7 ft-lb)

    G05657387Courtesy of SUBARU OF AMERICA, INC.
  28. Install the flywheel. Ref. to CLUTCH SYSTEM>Flywheel>INSTALLATION .
  29. Install the clutch disc and cover. Ref. to CLUTCH SYSTEM>Clutch Disc and Cover>INSTALLATION .
  30. Install the oil pump.
    1. Using the ST, install the front oil seal.

      ST 499587100

      OIL SEAL INSTALLER

      NOTE: Use a new front oil seal.
      G04997893Courtesy of SUBARU OF AMERICA, INC.
    2. Apply liquid gasket to the mating surfaces of oil pump.
      NOTE: Install within 5 min. after applying liquid gasket.

      Liquid gasket:

      THREE BOND 1217G (Part No. K0877Y0100), THREE BOND 1217H or equivalent

      G12437943Courtesy of SUBARU OF AMERICA, INC.
    3. Apply a thin coat of engine oil to the inside of front oil seal.
      G04997765Courtesy of SUBARU OF AMERICA, INC.
    4. Install the oil pump to cylinder block.
      CAUTION:
      • Be careful not to damage the front oil seal during installation.
      • Make sure the front oil seal lip is not folded.
      NOTE:
      • Align the flat surface of oil pump's inner rotor with that of crankshaft before installation.
      • Use new O-rings.
      • Do not forget to assemble O-rings.
    5. Apply liquid gasket to the three bolts thread shown in figure. (When reusing bolts)

      Liquid gasket:

      THREE BOND 1324 (Part No. 004403042) or equivalent

      Tightening Torque:

      6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

      G07909946Courtesy of SUBARU OF AMERICA, INC.
  31. Install the water pump and gasket.
    NOTE:
    • When installing the water pump, tighten bolts in two stages in alphabetical order as shown in the figure.
    • Use a new gasket.

    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)

    Fig 10: Water Pump Bolts Tightening Sequence
    G08539399Courtesy of SUBARU OF AMERICA, INC.
  32. Install the water bypass pipe for heater.

    Tightening Torque:

    6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

  33. Install the oil cooler. Ref. to LUBRICATION (STI)>Engine Oil Cooler>INSTALLATION .
  34. Install the oil filter. Ref. to LUBRICATION (STI)>Engine Oil Filter>INSTALLATION .
  35. Install the crank sprocket. Ref. to MECHANICAL(STI)>Crank Sprocket>INSTALLATION .
  36. Install the cylinder head. Ref. to MECHANICAL(STI)>Cylinder Head>INSTALLATION .
  37. Install the engine to the vehicle. Ref. to MECHANICAL(STI)>Engine Assembly>INSTALLATION .