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606 516 ALL Piston Ring and Piston -Side 002L
Clearance(Oil Regulating) .004L .006L(B)
SSP1776 1-6
PART 1 DIRECT DRIVE ENGINES
SECTION II CYLINDERS
Ref. Ref. Chart Nomenclature Dimensions Clearances Mfr. Mfr. New Old Min. Serv. Min. Serv. & Max. & Max.
Max. Max.
606 $517 A Piston Ring and Piston -Side .003L Clearance (Bottom) .0055L .007L(B)
607 ALL Piston Ring Gap (Compression) ::::::::::::: Plain and Chrome Cylinders .020 (Straight Barrels) .030 .047
...... Piston Ring Gap (Compression)
ALL ALL Nitrided and Chrome Cylinders .045 (Choke Barrels) .055 .067
ALL Piston Ring Gap (Oil Regulating) .015 (All Barrels) .030 .047
A-T2 Piston Ring Gap (Oil Scraper) .015 (All Barrels) .047
For Choke Barrels -Ring gap is measured within 4 inches from bottom. Ring gap at top of travel must not be :::::::::::less
than .0075. For all Other Barrels -Ring gap is measured at top limit of ring travel. Engine and Piston Application Min. Piston Diameter Cylinder Barrel
Max.
Clearance Engine Chart Type of Maximum Piston Skirt :: Code Letter Piston Number Top Bottom Type of Piston Surface Diameter & Cyl. 608 519 A 61147, 73851 4.3470 4.3555 Cast-Round P 4.3795 .021L
608 :522: 61333 4.3470 4.3555 Forged-Round P 4.3795 .021L 609 520: LW-11621*, LW-13623* 4.3290 4.3605 Cast-Cam N 4.3805 .018L 610 521 B 69841*, 69958, 70396 4.8290 4.8620 Cast-Cam P-C 4.8805 .018L :D 69958 4.8290 4.8620 Cast-Cam P 4.8805 .018L G,S,T 73196, 74059, 75413 5.0790 5.1090 Cast-Cam P-C-N 5.1305 .018L :::::::G 69337 5.0790 5.1090 Forged-Cam P- C 5.1305 .018L
J,S,Y,T 71594*, 72967*, 74530*, .:.:.: ::::::: 5.0790 5.1090 Cast-Cam 5.1305 .018L
75089* P-C-N B D LW-15357* 5.0790 5.1090 Cast-Cam N 5.1305 .018L S,T,AF 73264*, 75617*, 76966,
S,T,AF
78203*,LW-10207*, : : LW-13358*,LW-14610*, LW-11487*,LW-10545 5.0790 5.1090 Forged-Cam N-C 5.1305 .018L T LW-13396* 5.0790 5.1090 Cast-Cam N 5.1305 .018L
NOTES:
To find the average diameter of cylinder in an area 4" above Maximum taper and out-of-round permitted for cylinder in :::.::::::bottom of barrel: First, measure diameter at right angles service is .0045 inch.
:::-:::: from plane in which valves are located. Second, measure diameter through the plane in which valves are located. Add See Service Instruction No. 1243 for identification of cast both diameters; this sum, divided by 2, represents the average and forged pistons. The suffix "S" that will be found with diameter of the cylinder. the part number on 76966, 78203, LW-10207, LW-10545, :.:.:.:.:.:.:: LW-11487, LW-13358, LW-14610 pistons indicates the *=High Compression. piston weight is within the limits specified for any group of pistons and may be substituted for any like piston on a Cylinder Barrel: P=plain steel, N=nitride hardened, C=chrome particular engine. Other pistons are manufactured within plated. weight limits that do not require any weight controlled piston for replacement. To find the average out-of-round, measure diameter of cylinder in an area 4" above bottom of barrel: First, measure Piston diameter at top is measured at top ring land (between diameter at right angles from plane in which valves are top and second compression ring grooves) at right angle to located. Second, measure diameter through the plane in piston pin hole; diameter at bottom of piston is measured at which valves are located. Difference between diameters must the bottom of the piston skirt at right angles to the piston not exceed .0045 inch. pin. See Service Instruction No. 1243 for illustration.
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Lycoming SERVICE TABLE OF LIMITS AND TORQUE VALUE RECOMMENDATIONS(7)
