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Home >> Subaru >> 2004 >> Forester XT, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Accessory Drive Belts >> Engine Mechanical (H4DOTC) >> Cylinder Head Assembly >> Inspection >> Cylinder Head

Cylinder Head

  1. Make sure that no crack or other damage exists. In addition to visual inspection, inspect the important areas by means of red check.
  2. Measure the warping of the cylinder head surface that mates with crankcase by using a straight edge (A) and thickness gauge (B).

    If the warping exceeds 0.05 mm (0.0020 in), regrind the surface with a surface grinder.

    1. Warping limit: 0.05 mm (0.0020 in) 
    2. Grinding limit: 0.3 mm (0.012 in) 
    3. Standard height of cylinder head: 127.5 mm (5.02 in) 
    NOTE: Uneven torque for the cylinder head nuts can cause warping. When reassembling, pay special attention to the torque so as to tighten evenly.
    Fig 1: Measuring Warping Of Cylinder Head Surface Using Straight Edge And Thickness Gauge
    G00967045Courtesy of SUBARU OF AMERICA, INC.
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