916 ALL (AS APPLICABLE) 3/4-18 NPT Carburetor Drain Plug 144 in. lbs. 917 ALL (AS APPLICABLE) 1.00-14 Oil Cooler Bypass Valve 300 in. lbs. 918 ALL (AS PPLICABLE) 1 1/4-12
A  Oil Pressure Relief Valve 300 in. lbs.
SSP1776
1-34 PART 1 DIRECT DRIVE ENGINES
SECTION V SPECIAL TORQUE REQUIREMENTS (CONT.)
Ref. Ref.
Thread
New Old  Chart Size Nomenclature Torque Limits
919 871 ALL  1/4 Hex Head Hose Clamps (Worm Type) and Below 20 in. lbs.
5/16 Hex Head  Hose Clamps (Worm Type)
and Above  45 in. lbs.
920 ALL  Cylinder Head Drain Back Hose Clamps 10 in. lbs.
921 S-T  Exhaust V-Band Coupling Torque Data
T-Bolt Split 1/4 In. Drilled Hex Nut Coupling Size Avco Lycoming Vendor Type Locknut With Safety Wire Tube OD Part No. Part No. Torque In. Lbs. Torque In. Lbs.
1.75
in. LW-12093-4 MVT69183-175 65  75

2.00
in. LW-12093-5  MVT69183-200 85 75

2.25 in. LW-12093-6  MVT69183-225 85 75
2.25
in. LW-12125-3  MVT69197-225 85

3.69
in. LW-13464  U4204-55-369M 70

3.69 in. LW-14985  ANH1000902-10 70
922 ALL  Turbocharger V-Band Torque Data
Turbocharger ModelNo. V-ClampPart No. V-ClampDiameter Torque In. Lbs.
TO-473* 400500-600 6.00 in. 40-80 TEO659* 400500-685 6.85 in. 40-50 THO8A60* 400500-775 7.75 in. 40-60 THO8A69* 400500-775 7.75 in. 40-60 301E10-2** TC-6-15 6.50 in. 15-20
* -AiResearch turbocharger.
** -Rajay turbocharger.

See latest edition of Service Instruction No. 1238 for assembly procedure.
Thread
Chart Size Nomenclature  Torque Limits
927 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 (Crankcase Driving Torque) 100 in. lbs.
7/16-14  Cylinder Hold Down Studs (Crankcase Driving Torque) 200 in. lbs.
1/2-13  Cylinder Hold Down Studs (Crankcase Driving Torque) 250 in. lbs.
929 858  A-B-D-BD-BE-J-G-Y-3/8 Cylinder Hold Down Nuts
S-T-AF 300 in. lbs.

A1  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' Tightening Procedures -SeeSeelatest 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  LockingNut (Valve Adjusting Screw) 450 in. lbs.
　
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