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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical System >> Timing Chain Assembly >> Removal >> Timing Chain LH
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Timing Chain LH

  1. Remove the timing chain RH. Ref. to MECHANICAL (H4DOTC)>Timing Chain Assembly>REMOVAL>TIMING CHAIN RH .
  2. Using the ST and by turning the crankshaft, align the key of the crankshaft, the alignment mark (protrusion) of the intake cam sprocket LH and the alignment mark (protrusion) of the exhaust cam sprocket LH to the positions as shown in the figure.

    Preparation tool: 

    ST: CRANKSHAFT SOCKET (18252AA000)

    G13198767Courtesy of SUBARU OF AMERICA, INC.
  3. When the cam sprocket LH is removed, and the cam carrier LH is disassembled
    NOTE: Follow also steps below when the cam sprocket LH is removed, and the cam carrier LH is disassembled.
    1. Using the ST, loosen the bolts which hold the cam sprocket LH.
      CAUTION: In order to prevent damage on each component, be careful not to loosen the bolts too much.

      Preparation tool: 

      ST: SOCKET (18270KA010)

      G13198768Courtesy of SUBARU OF AMERICA, INC.
  4. Push up the chain tensioner lever LH as shown in the figure, and insert a stopper pin (clips, etc.) with a diameter of 1.2 mm (0.0472 in) or less or a hex wrench with a diameter of 1.2 mm into the stopper pin hole in the chain tensioner LH to secure the plunger (A).
    G13198769Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the chain tensioner LH, and remove the chain tensioner lever LH (A).
    G13198770Courtesy of SUBARU OF AMERICA, INC.
  6. Remove the O-ring from the cylinder block LH.
    G13198771Courtesy of SUBARU OF AMERICA, INC.
  7. Remove the chain guide LH, and remove the timing chain LH (A).
    CAUTION:
    • If the timing chain LH is not installed, the exhaust camshaft LH is kept at zero-lift position. All cams on the exhaust camshaft LH are not pressing down the roller rocker arm (exhaust valve). (Under this condition, exhaust valves remain unlifted.)
    • Intake camshaft LH is kept at lift position. All cams on the intake camshaft LH are pressing down the roller rocker arm (intake valve). (Under this condition, intake valves remain lifted.)
    • Intake camshaft LH and exhaust camshaft RH can be independently rotated with the timing chain LH removed. When the exhaust camshaft LH is turned, the valve heads contact each other and valve stem may bend as described in above. Do not turn the exhaust camshaft LH to the outside of range of zero-lift (in range where it can be turned lightly by hand).
    • The #4 piston is located near TDC. If the intake camshaft LH is turned, the valve and the piston may contact and valve stem may bend. Do not turn the intake camshaft LH at this time.
    NOTE: To avoid mixing with RH side, keep the removed part in order.
    G13198772Courtesy of SUBARU OF AMERICA, INC.
  8. Using the ST and by turning the crankshaft approximately 200° clockwise, align the alignment marks of crank sprocket to the positions as shown in the figure.
    CAUTION:
    • This procedure is required to prevent the valve and piston contacting with each other, by moving the all pistons to the middle of the cylinders.
    • Never turn counterclockwise because the valve and piston may contact. Counterclockwise turn is allowed only when adjusting precisely the alignment marks, after turning the crank sprocket alignment mark clockwise near the position as shown in the figure.

    Preparation tool: 

    ST: CRANKSHAFT SOCKET (18252AA000)

    G13198773Courtesy of SUBARU OF AMERICA, INC.
  9. Using ST1 and ST2 by turning the intake cam sprocket LH approximately 200° clockwise, align the alignment marks (protrusion) of intake cam sprocket LH to the positions (zero-lift position) as shown in the figure.
    CAUTION:
    • After this work, when the intake valve and exhaust valve lift at the same time, the valve heads contact each other and valve stem may bend. Do not turn the intake camshaft LH and exhaust camshaft LH to the outside of range of zero-lift (in range where it can be turned lightly by hand).
    • Perform the operation carefully since the ST comes off easily.
    NOTE: Intake camshaft LH has three peaks of drive sections for the high-pressure fuel pump. Therefore, there is little range where it can be turned lightly by hand in zero-lift position.

    Preparation tool: 

    ST1: PULLEY WRENCH (18355AA000)

    ST2: PULLEY WRENCH PIN SET (18334AA020)

    G13198774Courtesy of SUBARU OF AMERICA, INC.
  10. Remove the side chain guide LH from the front camshaft cap LH.
    G13198775Courtesy of SUBARU OF AMERICA, INC.
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