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Section 4 (Engine Mechanical (H6DO)): Camshaft: Inspection

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  1. Measure the bend, and repair or replace if necessary.

    Camshaft bend limit: 

    0.020 mm (0.00079 in) 

    Fig 1: Measuring Camshaft Bend Limit
    G05018755Courtesy of SUBARU OF AMERICA, INC.
  2. Check the journal for damage and wear. Replace if faulty.
  3. Check the cutout portion used for camshaft sensor for damage. Replace if faulty.
  4. Check the cam face condition; remove the minor faults by grinding with oil stone. Replace if there is uneven wear or others.
  5. Measure the cam lobe height "H" and cam base circle diameter "A". If it exceeds the standard or offset wear occurs, replace it.

    Cam lobe height H: 

    Standard 

    Intake 

    45.90 - 46.00 mm (1.8071 - 1.8110 in) 

    Exhaust 

    44.65 - 44.75 mm (1.7579 - 1.7618 in) 

    Cam base circle diameter A: 

    Standard 

    Intake 

    36.00 mm (1.4173 in) 

    Exhaust 

    36.00 mm (1.4137 in) 

    Fig 2: Identifying Cam Base Circle Diameter And Cam Lobe Height
    G05667860Courtesy of SUBARU OF AMERICA, INC.
  6. Measure the outside diameter of camshaft journal. If the journal diameter is not within specification, check the oil clearance.
      Camshaft journal
    Front Except for front
    Standard mm (in) 37.946 - 37.963 (1.4939 - 1.4946) 25.946 - 25.963 (1.0215 - 1.0222)
  7. Measure the oil clearance of camshaft journal.
    1. Clean the camshaft cap and cylinder head camshaft journal.
    2. Place the camshaft on cylinder head. (Without installing the valve lifter)
    3. Place a plastigauge across each camshaft journals.
    4. Gradually tighten the camshaft cap in at least two stages in the numerical order shown in the figure, then tighten to specified torque. Do not turn the camshaft.

      Tightening torque: 

      (1) - (12): 16 N.m (1.6 kgf-m, 11.8 ft-lb) 

      (13) - (17): 9.75 N.m (1.0 kgf-m, 7.2 ft-lb) 

      Fig 3: Identifying Camshaft Cap Bolts Tightening Sequence
      G06649859Courtesy of SUBARU OF AMERICA, INC.
    5. Remove the camshaft cap.
    6. Measure the widest point of the plastigauge on each journal. If oil clearance exceeds the standard, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.

      Camshaft oil clearance: 

      Standard 

      0.037 - 0.072 mm (0.0015 - 0.0028 in) 

      Fig 4: Measuring Camshaft Oil Clearance
      G04998726Courtesy of SUBARU OF AMERICA, INC.
    7. Completely remove the plastigauge.
  8. Measure the thrust clearance with setting the dial gauge at end surface of camshaft. If the thrust clearance is not within the standard or there is offset wear, replace the camshaft caps and cylinder head as a set. If necessary replace the camshaft.

    Camshaft thrust clearance: 

    Standard 

    Intake 

    0.075 - 0.135 mm (0.0030 - 0.0053 in) 

    Exhaust 

    0.075 - 0.135 mm (0.0030 - 0.0053 in) 

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