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Home >> Subaru >> 2021 >> Outback Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical System (2.4L)) >> Cylinder Block >> Assembly >> Piston And Connecting Rod

Piston And Connecting Rod

WARNING: This page is about a different variant/trim than selected.
G13949127Courtesy of SUBARU OF AMERICA, INC.
  1. Install the connecting rod bearing to the connecting rod and connecting rod cap.
  2. Install a new circlip on one side of the piston using a flat tip screwdriver.
    NOTE:
    • Be careful not damage the piston, by wrapping the tip of flat tip screwdriver with tape.
    • Install the circlip so that its end part (a) does not match the circlip groove cutout portion (b).
      G13949128Courtesy of SUBARU OF AMERICA, INC.
    • Make sure the circlip is firmly inserted into the circlip groove.
  3. Set the piston to the connecting rod.
    NOTE: Align the front mark of piston and the connecting rod direction correctly as shown in the figure.
    G13949129Courtesy of SUBARU OF AMERICA, INC.
  4. Apply engine oil to the piston pin, and attach the piston pin.
  5. Install a new circlip on the piston using a flat tip screwdriver.
    NOTE:
    • Be careful not damage the piston and piston pin, by wrapping the tip of flat tip screwdriver with tape.
    • Install the circlip so that its end part (a) does not match the circlip groove cutout portion (b).
      G13949130Courtesy of SUBARU OF AMERICA, INC.
    • Make sure the circlip is firmly inserted into the circlip groove.
  6. Install the oil rings to the piston in the order of expander, lower rail and upper rail by hand.
    NOTE: Oil ring consists of the upper rail, expander and lower rail.
    G13949131Courtesy of SUBARU OF AMERICA, INC.
    1. Set the ring gap of the expander to the position (A).
      G13949132Courtesy of SUBARU OF AMERICA, INC.
    2. Set the lower rail spin stopper (C) to the piston oil groove (B), and hook the lower rail spin stopper(E) to the expander (D).
      G13949133Courtesy of SUBARU OF AMERICA, INC.
    3. Set the upper rail gap to the position (F), and hook the upper rail spin stopper (G) to the expander (D).
    G13949134Courtesy of SUBARU OF AMERICA, INC.
  7. Install the compression rings to the piston in the order of second ring and top ring, using piston ring expander.
    1. Set the ring gap of the second ring to the position (A) in the figure.
      NOTE: The ring mark (2AT) on the second ring should face the piston crown.
      G13949135Courtesy of SUBARU OF AMERICA, INC.
    2. Set the ring gap of top ring at (B) in the figure on the 180° opposite direction of (A).
      NOTE: The ring mark (1AU) of the top ring should face the piston crown.
    G13949136Courtesy of SUBARU OF AMERICA, INC.
  8. Check again that the piston rings are installed correctly.
    NOTE: Also check that the piston ring gap (except oil ring lower rail) is not positioned within the range of piston skirt extended line.
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