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Home >> Subaru >> 2013 >> Forester XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Mechanical (H4DO)) >> Cylinder Head >> Inspection >> Valve Shim

Valve Shim

WARNING: This page is about a different variant/trim than selected.
  1. Visually check the valve shim for damage.
  2. Check the clearance between valve shim and valve stem end. Check the clearance between valve shim and valve stem end by measuring the inner diameter of valve shim and the outer diameter of valve stem end respectively.
    1. Using a caliper gauge, measure the inner diameter of valve shim. If it is not within the standard, replace the valve shim.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • If the valve shim has to be replaced, check the cam clearance and replace with the suitable valve shim. < Refer to WHEN TIMING CHAIN ASSEMBLY IS REMOVED , INSPECTION, Cam Clearance. >

      Valve shim inner diameter: 

      Standard 

      5.500 - 5.560 mm (0.2165 - 0.2189 in) 

      Fig 1: Measuring Inner Diameter Of Valve Shim Using Caliper Gauge
      G08563152Courtesy of SUBARU OF AMERICA, INC.
    2. Measure the outer diameter of valve stem end with a micrometer. If it is not within the standard, replace the valve.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • If the valve is replaced, put a small amount of grinding compound on the valve seat surface of cylinder head, and lap the valve and valve seat surfaces.

      Valve stem end outer diameter: 

      Intake 

      Standard 

      5.455 - 5.470 mm (0.2148 - 0.2154 in) 

      Exhaust 

      Standard 

      5.445 - 5.460 mm (0.2144 - 0.2150 in) 

      Fig 2: Measuring Outer Diameter Of Valve Stem End With Micrometer
      G08563153Courtesy of SUBARU OF AMERICA, INC.
    3. Calculate the clearance between valve shim and valve stem end. If the clearance exceeds the standard, replace the valve shim or valve, whichever shows the greater amount of wear or damage.
      NOTE:
      • If the valve is replaced, put a small amount of grinding compound on the valve seat surface of cylinder head, and lap the valve and valve seat surfaces.
      • If the valve shim has to be replaced, check the cam clearance and replace with the suitable valve shim. < Refer to WHEN TIMING CHAIN ASSEMBLY IS REMOVED , INSPECTION, Cam Clearance. >

      Clearance between the valve and valve stem end: 

      Intake 

      Standard 

      0.030 - 0.105 mm (0.0012 - 0.0041 in) 

      Exhaust 

      Standard 

      0.040 - 0.115 mm (0.0016 - 0.0045 in) 

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