TM 10-4320-344-24j .Remove valve seat as follows:(1) Place mandrel (Figure 4-5, 1) on valve seat and insert guide through mandrel(1) into valve stem.Tighten guide so that mandrel (1) is firmly in place.Do not drill into cylinder head.Failure to obey this caution will result inequipment damage.(2) Insert drill (2) into mandrel (1) and drill through valve seat at twopositions 180° apart.(3) Remove guide and mandrel (l).(4) Remove drilled seat.(5) Measure diameter of valve seat bore in cylinder head (4).Intake valve seats have larger outside diameter than exhaust valve seats.(6) Measure outside diameter of new valve seat. Subtract the diameter of borefrom diameter of seat.Difference must not be less than0.003 inches (0.076 mm).Heating cylinder head for more than 30 minutes or at a higher temperaturethan 430° F (220° C) may cause cylinder head to warp.Failure to obey thiscaution could result in equipment damage.k.Heat cylinder head (4) in oven to a temperature of 430° F (220° C).Do notheat cylinder head more than 30 minutes.Do not touch cylinder head, while it is hot, without protective gloves.Exercise care when working around hot cylinder head.Severe burns can resultif protective measures are not taken.Failure to obey this warning mayresult in personal injury.l .Remove cylinder head (4) from oven.If valve guides are in need of replacement.Replace at this time.m.Insert arbor (3) into chamber side of valve guide and drive valve guide out ofcylinder head (4).n.Place new retaining ring (Figure 4-2,8) on new valve guide (9) and drivelonger end of valve guide (9) into bore of cylinder head (1) from the rockerarm side.Drive valve guide (9) in until retaining ring (8) seats in valveo .Place new valve seat (Figure 4-5,5) on drift with chamfered side up and drivevalve seat (5) into recess of cylinder head (4).Ensure that valve seat isfully inserted.guide bore of cylinder head (1).4-13
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