TM 10-4320-226-146.6.2h.i.j.k.CylinderHeadRepair. (continued)Check clearance of valve stems in guides of both valves.If it exceeds .0016inch (.04 mm) inlet valve, or .0024 (.06 mm) exhaust valve, replace guides.Mandrels (intake and exhaust) come in two sizes.One willfit exhaust valve seat and other will fit intake valveseat.Remove valve seat as follows:(1)(2)(3)(4)(5)(6)HeatheadPlace mandrel (figure 6-5, 1) on valve seat and insert guide throughmandrel into valve stem.Tighten guide so that mandrel is firmly inplace.Do not drill into cylinder head.Failure to obey thiscaution may result in equipment damage.Insert drill (2) into mandrel (1) and drill through valve seat at twopositions 180° apart.Remove guide andCarefully removeMeasure diametermandrel (1).drilled seat.of valve seat bore in cylinder head.Intake valve seats have larger outside diameter thanexhaust valve seats.Measure outside diameter of new valve seat.Subtract the diameter ofbore from diameter of seat.Difference must not be less than0.003 inch (0.076 m).Heating cylinder head for more thanhigher tempreture than 430° F (220°head to warp.Failure to obey thisRemoveequipment damage.cylinder head in oven to amore that 30 minutes.30 minutes or at aC) may cause cylindercaution could result intemperature of 430° F (220° C).Do not heatDo not touch cylinder head while it is hot withoutprotective gloves.Exercise care when working around hotcylinder head.Severe burns can result if protectivemeasures are not taken.Failure to obey this warning mayresult in personal injury.head from oven.6-15
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