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Piston And Connecting Rod

G16346605Courtesy of SUBARU
(1) Connecting rod
(2) Connecting rod bearing (connecting rod side)
(3) Connecting rod bearing (connecting rod cap side)
(4) Connecting rod cap
(5) Piston
(6) Piston pin
(7) Circlip
(8) Oil ring
(9) Second ring
(10) Top ring
  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).
      G13224594Courtesy of SUBARU
    • 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.
    G16346609Courtesy of SUBARU
    (a) RH side (#1 and #3)
    (b) LH side (#2 and #4)
    (c) Front mark
  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).
      G13224596Courtesy of SUBARU
    • 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.
    G16346613Courtesy of SUBARU
    (a) Upper rail
    (b) Expander
    (c) Lower rail
    1. Set the ring gap of the expander to the position (A).
      G13224598Courtesy of SUBARU
    2. Set the ring gap of the lower rail at position (B), located 60° counterclockwise from the position (A) in the figure.
      G13224599Courtesy of SUBARU
    3. Set the ring gap of the upper rail at position (C), located 120° counterclockwise from the position (B) in the figure.
      G13224600Courtesy of SUBARU
    4. Align the upper rail spin stopper (E) to the side hole (D) on the piston.
    G13224601Courtesy of SUBARU
  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 (2RE) on the second ring should face the piston crown.
      G13224602Courtesy of SUBARU
    2. Set the ring gap of top ring at (B) in the figure on the 180° opposite direction of (A).
    NOTE: The ring mark (1RE) of the top ring should face the piston crown.
    G13224603Courtesy of SUBARU
  8. Check again that the piston rings are installed correctly.
NOTE: Also check that the ring gaps is not positioned within the range of piston skirt extended line.
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