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Valve Clearance: Inspection

WARNING: This page is about a different variant/trim than selected.
CAUTION: 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 valve clearance should be performed while engine is cold.
  1. Remove the collector cover.
    NOTE: Follow the steps below when removing the collector cover.
    1. Pull up the two points at the rear (A).
    2. Pull up the two points at the front (B) while moving them forward.
      Fig 1: Removing Collector Cover
      G06651504Courtesy of SUBARU OF AMERICA, INC.
  2. Disconnect the ground cable from battery.
  3. Lift up the vehicle.
  4. Remove the under cover. Refer to FRONT UNDER COVER .
  5. Lower the vehicle.
  6. When inspecting #1, #3 and #5 cylinders
    1. Remove the air intake duct, air cleaner case and air intake boot assembly. Refer to AIR INTAKE DUCT . Refer to AIR CLEANER CASE . Refer to AIR INTAKE BOOT .
    2. Remove the fuel pipe protector (RH).
      Fig 2: Locating Fuel Pipe Protector Mounting Screws
      G07912260Courtesy of SUBARU OF AMERICA, INC.
    3. Disconnect the connector of oil pressure switch.
    4. Remove the ignition coil. Refer to IGNITION COIL .
    5. Remove the rocker cover (RH). Refer to , REMOVAL , Camshaft.
  7. When inspecting #2, #4 and #6 cylinders
    1. Remove the battery and battery carrier. Refer to BATTERY .
    2. Remove two fixing clips on the fuel pipe protector (LH).
      Fig 3: Locating Fuel Pipe Protector (LH) Clips
      G06651188Courtesy of SUBARU OF AMERICA, INC.
    3. Generator connector
    4. Generator terminal B
    5. Remove the harness cover from collector cover bracket.
    6. A/C compressor solenoid connector
    7. Flow sensor connector
      Fig 4: Locating Flow Sensor Connector
      G07912583Courtesy of SUBARU OF AMERICA, INC.
    8. Slide the harness and connector to the battery side.
    9. Disconnect the PCV hose and blow-by hose from the rocker cover (LH).
      Fig 5: Locating Rocker Cover PCV Hose And Blow-By Hose
      G07912251Courtesy of SUBARU OF AMERICA, INC.
    10. Remove the fuel pipe protector (LH).
      Fig 6: Locating Fuel Pipe Protector
      G07912256Courtesy of SUBARU OF AMERICA, INC.
    11. Remove the ignition coil. Refer to IGNITION COIL .
    12. Remove the rocker cover (LH). Refer to , REMOVAL , Camshaft.
  8. Turn the crankshaft clockwise until the camshaft is set to position shown in the figure.
    Fig 7: Identifying Crankshaft Positioning Dimensions
    G07912586Courtesy of SUBARU OF AMERICA, INC.
  9. Measure the clearance of intake valve and exhaust valve using thickness gauge (A).
    NOTE:
    • Measure it within the range of ±30° from specified position shown in the figure.
    • Insert a thickness gauge in a direction as horizontal as possible with respect to the valve lifter.

    Valve clearance (inspection value): 

    Intake 

    0.20 +0.04 -0.06  mm (0.0079 +0.0016 -0.0024  in) 

    Exhaust 

    0.35±0.05 mm (0.0138±0.0020 in) 

    • If the measured value is not within specification, take notes of the value in order to adjust the valve clearance later on.
      Fig 8: Measuring Clearance Of Intake Valve And Exhaust Valve Using Thickness Gauge
      G05018666Courtesy of SUBARU OF AMERICA, INC.
  10. If necessary, adjust the valve clearance. Refer to , ADJUSTMENT , Valve Clearance.
  11. Further turn the crank pulley clockwise and then measure the valve clearances again.
  12. After inspection, install the related parts in the reverse order of removal. Refer to , INSTALLATION , Camshaft.
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