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When Timing Chain Assembly Is Not Removed

CAUTION: When working on the vehicle, if engine oil is spilt onto the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.
NOTE: Inspection of cam clearance should be performed while engine is cold.
  1. Remove the V-belts. (Except for hybrid model) Refer to MECHANICAL (H4DO (EXCEPT FOR HEV))>V-BELT>REMOVAL .
  2. When inspecting #1 and #3 cylinders
    1. Remove the rocker cover RH. Refer to MECHANICAL (H4DO (EXCEPT FOR HEV))>ROCKER COVER>REMOVAL>ROCKER COVER RH .
      NOTE: When working on the vehicle, place a suitable container under the vehicle.
    2. Set #1 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the wrench.
      NOTE: When the timing mark (B) on crank pulley is aligned to the 0° in timing gauge (A) on chain cover as shown in the figure, the #1 cylinder piston is located at TDC of compression stroke if the intake camshaft and exhaust camshaft does not depress the #1 cylinder intake side roller rocker arm (intake valve) and exhaust side roller rocker arm (exhaust valve). If roller rocker arm (valve) is depressed, turn the crank pulley by 360° in order to make #1 cylinder piston at TDC of compression stroke.
      • Except for hybrid model
        G11253138Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
      G13230010Courtesy of SUBARU OF AMERICA, INC.
    3. Check the cam clearance for #1 cylinder intake, #1 cylinder exhaust and #3 cylinder exhaust.
      NOTE:
      • Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
      • If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.

      Cam clearance: 

      Intake 

      Standard 

      0.13+0.02-0.03 mm (0.0051+0.0008-0.0012 in)

      Exhaust 

      Standard 

      0.22±0.02 mm (0.0087±0.0008 in)

      G13230011Courtesy of SUBARU OF AMERICA, INC.
    4. Turn the crank pulley by 360°.
      • Except for hybrid model
        G11253140Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
      G13230013Courtesy of SUBARU OF AMERICA, INC.
    5. Check the cam clearance of #3 cylinder intake.
      NOTE:
      • Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
      • If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.

      Cam clearance: 

      Standard 

      0.13+0.02-0.03 mm (0.0051+0.0008-0.0012 in)

    G13230014Courtesy of SUBARU OF AMERICA, INC.
  3. When inspecting #2 and #4 cylinders
    1. Remove the rocker cover LH. Refer to MECHANICAL (H4DO (EXCEPT FOR HEV))>ROCKER COVER>REMOVAL>ROCKER COVER LH .
      NOTE: When working on the vehicle, place a suitable container under the vehicle.
    2. Set #2 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the wrench.
      NOTE: When the timing mark (B) on crank pulley is aligned to the 0° in timing gauge (A) on chain cover as shown in the figure, the #2 cylinder piston is located at TDC of compression stroke if the intake camshaft and exhaust camshaft does not depress the #2 cylinder intake side roller rocker arm (intake valve) and exhaust side roller rocker arm (exhaust valve). If roller rocker arm (valve) is depressed, turn the crank pulley by 360° in order to make #2 cylinder piston at TDC of compression stroke.
      • Except for hybrid model
        G11253142Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
      G13230016Courtesy of SUBARU OF AMERICA, INC.
    3. Check the cam clearance for #2 cylinder intake, #2 cylinder exhaust and #4 cylinder exhaust.
      NOTE:
      • Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
      • If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.

      Cam clearance: 

      Intake 

      Standard 

      0.13+0.02-0.03 mm (0.0051+0.0008-0.0012 in)

      Exhaust 

      Standard 

      0.22±0.02 mm (0.0087±0.0008 in)

      G13230017Courtesy of SUBARU OF AMERICA, INC.
    4. Turn the crank pulley by 360°.
      • Except for hybrid model
        G11253140Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
      G13230013Courtesy of SUBARU OF AMERICA, INC.
    5. Check the cam clearance of #4 cylinder intake.
      NOTE:
      • Measure the roller surface of cam base circle and roller rocker arm using thickness gauge (A).
      • If the measured value is out of standard, take notes of the value in order to adjust the cam clearance later on.

      Cam clearance: 

      Standard 

      0.13+0.02-0.03 mm (0.0051+0.0008-0.0012 in)

      G13230020Courtesy of SUBARU OF AMERICA, INC.
  4. If necessary, adjust the cam clearance. Refer to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM CLEARANCE>ADJUSTMENT .
  5. After inspection, install the related parts in the reverse order of removal.
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