TM 5-3805-262-34INSPECTION/REPAIR (SHEET 4 OF 6)(7) Position each valve (6 and 9) in mating cylinder head bore and measurevalve head recession using straight edge and thickness gage. Replacevalve if recession exceeds 0.060 inch and check with new valve. If reces-sion is greater than 0.060 inch with new valve, or if seat insert (7 or10) is cracked or burned, replace seat insert as follows:Temperature of solid carbon dioxide (dry ice) is below -70 degrees F.Wear insulated gloves to prevent severe skin injury. If skin is injuredby contact with dry ice, flush with large amounts of cold water to raisetemperature above freezing point and obtain medical aid immediately.(a) Pack new seat insert (7 or 10) in dryDo not use punch, chisel, or pry bar toremove seat inserts (7 and 10). Use ofthese or similar tools will damage cyl-inder head.(b) Pull seat insert (7 or 10) from cyl-inder head using seat removal tool.If tool is not available, removeseat by machining out.(c) Clean recessed area in cylinderhead.(d) Press chilled seat insert (7 or 10)into cylinder head until bottomed inrecess.ice.3-79
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