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Cylinder Head Measurement

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Using Straightedge To Inspect Cylinder Head Sealing Surface For Flatness
    GM2189666Courtesy of GENERAL MOTORS COMPANY
  1. Inspect the cylinder head sealing surface for flatness. Use a straightedge (1). Refer to Engine Mechanical Specifications  to find the permitted values. If the measurement does not show the permitted values, replace the cylinder head. Machining is NOT allowed.
    2. Fig 2: Checking Valve Stem To Guide Clearance Measurement
    GM2189672Courtesy of GENERAL MOTORS COMPANY
  2. Prepare the gauge for valve stem to guide clearance measurement. Assemble the EN-6216  gauge and the EN-6216-200/300/400  gauge instruments as followed:
    1. Install the extension (5) to the support (4).
    2. Install the inside caliper (2) to the extension (5).
    3. Install the gauge (3) to the support (4) and pretension to 1 mm (0.0394 in).
    4. Install the calibration washer (1) as shown to justify the gauge.
    5. Adjust the gauge to 0 mm (0 in) by rotating the instrument dial.
    6. Cautious remove the calibration washer (1).
    3. Fig 3: Measuring Valve Guide Inner Diameter
    GM2189673Courtesy of GENERAL MOTORS COMPANY
  3. Measure the valve guide inner diameter (2) as shown in different areas (3). Use EN-6216  gauge (1) and gauge instruments. Note the measurement results. Refer to Engine Mechanical Specifications  to find the permitted values.
  4. Substract the valve stem diameter from valve guide inner diameter to calculate the valve stem to guide clearance. Refer to Engine Mechanical Specifications  to find the permitted values.
  5. Turn the cylinder head upside down.
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