Lycoming SERVICE TABLE OF LIMITS AND TORQUE VALUE RECOMMENDATIONS(36)

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.5665 
E  Diameter  of Piston  Pin Plug  .8405 
(Thin Wall Pin)  .8415 
* See latest edition  of Service Instruction  No. 1267. 
606  514  ALL  Piston  Ring and Piston  -Side 
Clearance (Top Rin Half Wedge g Comp.)  .0025L .0055L  .008L(B) 
606  515  ALL  Piston Ring and Piston -Side 
Clearance (2nd Ringg Comp.)
 .000 
Full or Half Wedge  .004L  .006L(B) 
ALL  Piston Ring and Pistonton -Side 
(AS APPLICABLE)  Clearance (3rd Ring Comp.)
 .000 
Half Wedge  .004L  .006L(B) 
606  516  ALL  Piston Ring and Piston -ton -Side
 .002L 
Clearance (Oil ReguRegulating)  .004L  .006L(B) 

517::::ALL Piston Ring and Piston -.003Lton -Side
(AS APPLICABLE) Clearance (Oil Scraper)
Scraper) .0055L .007L(B)
Ref.  Ref. 
New  Old 
607  615 

608 519 608 522 609 ::520 610
.
SSP1776
PART III GEARED ENGINES
SECTION II CYLINDERS
Nomenclature Clearances Mfr. Mfr. Min. Serv. Min. Serv.
& Max. & Max. Max. Max.
Chart  Nomenclature Dimensions
ALL  Piston Ring Gap (Compression)
Compression) Plain and Chrome Cylinders .020 (Straight Barrels) .030
.047
ALL  Piston Ring Gap (Compression)
Compression) Nitrided and Chrome Cylinders .045 (Choke Barrels) .055 .067
ALL  Piston Ring Gap (Oil Regulating)
.015
(All Barrels) .030 .047

ALL Piston Ring Gap (Oil Scraper) .015
(AS APPLICABLE) (All Barrels) .047

.030
For Choke Barrels -Ring gap is measured within 4 inches from bottom.
Inches Ring gap at top of travel must not be less than .0075.
For all Other Barrels -Ring gap ismeasured at top limit of
ring
travel.

Engineand PistonApplication Min.PistonDiameter  CylinderBarrel
eter
Max. ClearanceEngineChart
Typeof Maximum PistonSkirtCodeLetter PistonNumber Bottom Typeof Piston Surface Diameter & Cyl.
Top tom
E 67266,71553 4.8395 4.8!8540 Forged-Round P 4.8805 .018L
E 73620,73628 4.8395 4.8540.8540 Forged-Round N 4.8805 .018L

E 67266,71553,73620,
73628,73932 4.8395 4.8540 Forged-Round 4.8805 .0225L

.8540 CE 75984 4.8395 4.8590 Forged-Cam 4.8805 .018L
.8590 C-NH-P 69236 5.0905 5.1040 Forged-Round 5.1305 .0225L
.1040 P-CH-P 71545,71608* 5.0905 5.1025.1025 Forged-Round C 5.1305 .024L
H-P-AB-AC 71940,72249*,72578, 73947*,73976 5.0905 5.1040 Forged-Round 5.1305 .0225L
.1040  C
H-AC 71940,72249*,73947*, 73976 5.0905 .1040
5.1040 Forged-Round N 5.1305 .023L
H-P-AB 74242,75617* 5.0790 5.1090
.1090 Forged-Cam C 5.1305 .018L
　
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