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Maximumtaper and out-of-roundpermittedfor cylinderin serviceis.0045inch.
SeeServiceInstructionNo. 1243for identificationof forgedpistons.The suffix "S" that will be found with the partnumberon 76966andLW-10545pistonsindicatesthepistonweightis within the limits specifiedfor anygroupof pistonsand may besubstitutedfor any like piston on a particular engine.Otherpistonsaremanufacturedwithin weightlimits that do not require any weight controlled piston for replacement.
Pistondiameterat top is measuredat top ringland(between top andsecondcompressionring grooves)at right anlesto pistonpin hole;diameterat bottom of pistonismeasuredat the bottom of the pistonskirt at right anglesof the piston pin.SeeServiceInstructionNo.1243for illustration.
Chart aclature Dimensions Clearances
Nomenclature
611 523 AQ-AZ Exhaust Valve Seat arand Cylinder Head
AQ-AZ O.D. Exhaust Seat
AQ-AZ I.D. Exhaust Seat Hole in Cylinder Head
612 524 AQ-AZ Intake Valve Seat and Cylinder Head
AQ-AZ O.D. Intake Seat
AQ-AZ I.D. Intake Seat Hole in Cylinder Head
613 526 AQ-AZ Exhaust Valve Guide and Cylinder Head
613 527 AQ-AZ O.D. Exhaust Valve GGuide
AQ-AZ I.D. Exhaust Valve Guide
AQ-AZ Hole in Cylinder Head
Mfr. Mfr.
Min. Serv. Min. Serv.
& Max. & Max.
Max. Max.
.0075T
.011T (A)
1.9355
1.937
1.926
1.928
.0065T
.010T (A)
2.2885
2.290
2.280
2.282
.0011T
.0030T (A)
.6954
.6963
.6933
.6943
2-8
SECTION II CYLINDERS
Ref. Ref. Chart Nomenclature Dimensions Clearances Mfr. Mfr.
New Old
Min. Serv. Min. Serv. & Max. & Max. Max. Max.
614 527 AQ-AZ Intake Valve Guide and .0010T Cylinder Head .0025T
: AQ-AZ O.D. Intake Valve Guide ,5933
.5938
AQ-AZ I.D. Intake Valve Guide Hole .5913
in Cylinder Head .5923
615 528 AQ-AZ Exhaust Valve Stem and .0037L Valve Guide .0050L (A)
AQ-AZ O.D. Exhaust Valve Stem .4955 .4965 .4937
615 ..527 AQ-AZ Finished I.D. Exhaust Valve .4995 Guide .5005
1/2 inchh diameter exhaust valves may have exhaust valve guides that are .003 in. over the maximum insidediameterer limit, anytime up to 300 hours of service. After 300 hours of service, inside diameter of exhaust valve
guide rrmayincrease .001 in. during each 100 hours of operation up to the recommended overhaul time for the
engine,or not to exceed .015 inch over the basic I.D. See latest edition of Service Instruction No. 1009 forrecommendedr
mendedoverhaul time.
616 529 AQ-AZ Intake Valve Stem and .0010L Valve Guide .0028L .006L
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