TM 10-4320-226-146.6.2 CylinderHeadRepair.(continued)Figure 6-3.Checkinge.Check that cylinder head seatingSlight damage to seating surfaceCylinder Head Seating Surface.surface (figure 6-3) is flat and square.can be ground.f. After reworking, measure clearance between cylinder head bottom and cylinderhead seating surface.The measured value may not be lower than 0.23 inch(5.8 m).g. Insert valve in seat and measure distance from crown of valve to cylinder headseating surface (figure 6-4).If distance exceeds specifications on eithervalve, (table 6-1), seat must be replaced.Figure 6-4.Valve Depth Measurement.6-13
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