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H-P-AB-AC 74242,76258* 5.0790 5.1090 Forged-Cam N 5.1305 .018L
.1090
AC 75617*,76258* 5.0790 .1090
5.1090 Forged-Cam C-N 5.1305 .018L
H-P-AB-AC 73264*,75961,76966, 78203*, 78762, LW-10207*,LW-10208, LW-10545
.1090
5.0790 5.1090 Forged-Cam C-N 5.1305 .018L
NOTES:
To find the averagediameterof cylinderinanarea4" above
Maximumtaper and out-of-roundpermittedfor cylinderinbottomof barrel:First,measurediameterat right anglesfrom serviceis.0045inch.
planein whichvalvesarelocated.Second,measurediameter through the planein which valvesare located.Add both SeeServiceInstructionNo.1243for identificationof castand diameters;this sum, divided by 2, representsthe average forgedpistons.Thesuffix"S" thatwill befoundwith thepart
diameterofthecylinder. numberon 73947, 74242, 75984, 75961, 76966, 78203,78762,LW-10207,LW-10208,LW-10545pistonsindicatesthe *=HighCompression. pistonweightis within the limits specifiedfor anygroupof
pistonsand may be substitutedfor any like piston on aCylinderBarrel:P=Plainsteel,N=nitride hardened,C=chrome particularengine. Other pistons are manufacturedwithin plated. weightlimits thatdo notrequireanyweightcontrolledpiston
for replacement. To find the averageout-of-round,measurediameterof
cylinderin anarea4" abovebottom of barrel:First,measure Pistondiameterat top is measuredat top ringland(between diameterat right anglesfrom plane in which valvesare top andsecondcompressionring grooves)at right angleto located. Second,measurediameterthrough the plane in pistonpinhole;diameteratbottomof pistonismeasuredatthe whichvalvesarelocated.Differencebetweendiametersmust bottom of the pistonskirt atright anglesto thepistonpin.See not exceed.0045inch. ServiceInstructionNo.1243for illustration.
3-9
Ref. New
612
613
614
615
SERVICE TABLE OF LIMITS
PART III GEARED ENGINES
SECTION II CYLINDERS
Ref. Chart Nomenclature Dimensions Clearances Mfr. Mfr. Old Min. Serv. Min. Serv. & Max. & Max. Max. Max.
523 ALL Exhaust Valve Seat and .0075T
Cylinder Head
.011T (A)
ALL O.D. Exhaust Seat 1.9355
1.937
ALL I.D. Exhaust Seat Hole 1.926
in Cylinder Head 1.928
:524::: ALL Intake Valve Seat and .0065T Cylinder Head .010T (A)
E-H-P O.D. Intake Seat 2.1675
2.169
AB-AC O.D. Intake Seat 2.2885
2.290
E-H-P I.D. Intake Seat Hole 2.159
in Cylinder Head 2.161
AB-AC I.D. Intake Seat Hole 2.280
in Cylinder Head 2.282
526 ALL Exhaust Valve Guide and .001T Cylinder Head .0025T (A)
52 ALL O.D. Exhaust Valve Guide .6633 6638
ALL I.D. Exhaust Valve Guide .6613
Hole in Cylinder Head .6623
527 ALL Intake Valve Guide and .001T Cylinder Head .0025T (A)
ALL O.D. Intake Valve Guide .5933
.5938
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Lycoming SERVICE TABLE OF LIMITS AND TORQUE VALUE RECOMMENDATIONS(37)
