7.75 40-60 301E10-2** TC-6-15 50 in.
6.50 15-20
* -AiResearch turbocharger.
** -Rajay turbocharger.
See latest edition of ServiceInstruction No. 1238 for assemblyprocedure.
Thread Chart Size Nomenclature Torque Limits
927 863 ALL DUAL MAGNETO 1/2-20 Crankshaft Gear Bolt
MODELS 660 in. lbs.
BD 1/4 Crankshaft Gear Bolts 96 -120 in. lbs.
928 ALL 3/8-16 Cylinder Hold Down Studs (CrankcaseDrivingTorque 100 in. lbs.
7/16-14 Cylinder Hold Down Studs (CrankcaseDrivingTorque 200 in. lbs.
1/2-13 Cylinder Hold Down Studs (CrankcaseDrivingTorque 250 in. lbs.
929 858 A-B-D-BD-BE-J-G-Y-3/8 Cylinder Hold Down Nuts 858 S-T-AF 300 in. lbs.
Al 7/16 Cylinder Hold Down Nuts 420 in. lbs.
B-D-BD-BE-J-G-Y-1/2 Cylinder Hold Down Nuts
S-T-AF 600 in. lbs.
Cylinder Hold Down and Crankcase Parting Flange Nuts' TighteningProcedures -Seelatest edition of Service Instruction No. 1029.
SSP1776 1-35
SERVICE TABLE OF LIMITS
PART 1 DIRECT DRIVE ENGINES
SECTIONV SPECIAL TORQUE REQUIREMENTS(CONT.)
Ref. Ref. Thread
New Old Chart Size Nomenclature Torque Limits
930 849 ALL 3/8 Allen Head Screw (Diaphragm Fuel Pump) 225 -250 in. lbs.
931 A 9/16 Locking Nut (Valve Adjusting Screw) 450 in. lbs.
5/16-18 Exhaust Transitions -Studs (Driving Torque) 100 in. lbs.
3/8-16 Exhaust Transitions -Studs (Driving Torque) 200 in. lbs.
SECTIONV SPRINGS
Length COMP. LOAD Avco Lyc. Wire At Comp. Mfr. Mfr. Serv. Chart Nomenclature Part Nc . Dia. Length Min. Max. Max.
950 800 A-B-D-G-J-S-T-Y-Outer Valve Springs 76994 BD-BE (Parallel) LW-1180010 .177 1.30 in. 112 lb. 122 lb. 109 lb. min.
A-B-D-G-J-S-T-Y-Outer Valve Springs
BD-BE (Parallel) 65427 .162 1.30 in. 82 lb. 89 lb. 79 lb. min.
S1-S2-S3-S5-S6-Outer Valve Springs
S7-S9-S1O-T2-T3 (Angle) 68326 .177 1.46 in. 103 lb. 111 lb. 100 lb. min.
S1-S2-S3-S5-S6-Outer Valve Springs
S7-S9-S10-T2-T3 (Angle) LW-117996 .182 1.43 in. 116 lb. 124 lb. 113 lb. min.
951 801 A-B-D-G-J-S-T-Y-Auxilliary Valve 65567 BD-BE Spring (Parallel) LW-117895 .135 1.17 in. 61 lb. 67 lb. 58 lb. min.
S1-S2-S3-S5-S6-S7-Auxilliary Valve 68328
S9-S10-T2-T3-AF Spring (Angle) LW-117997 .142 1.33 in. 75 lb. 83 lb. 72 lb. min.
952 802 ALL Oil Pressure Relief 803 (AS APPLICABLE) Valve Spring Avco LycomingIdentification PartNumbers Dye Free Length
61084
None 2.18 .054 1.30 in. 8.5 lb. 9.5 lb. 8.3 lb. min. 65703 None 2.16
.063 1.47 in. 17.8 lb. 19.4 lb. 18.0 lb. min 68668 Purple 2.04 .054 1.30 in. 7.1 lb. 7.8 lb. 6.9 lb. min. 77467 Yellow 1.90 .054 1.30 in. 6.4 lb. 7.1 lb. 6.2 lb. min. LW-11713 White 2.12 .059 1.44 in. 10.79 lb. 11.92 lb. 10.5 lb. min.
953 811 A-B-G-J-S-T-Y-AF Oil Cooler Bypass Spring .0465 1.94 in. 6.50 lb. 7.25 lb. 6.41 lb. min.
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