IH: Engine Mechanicals - Sub-09C

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====== IH: Engine Mechanicals - Sub-09C ======
====== Ironhead Motor Mount Torque Specs ======

There are no torque specs for the motor mount bolts in the 57-78 FSMs. \\
And there is only one spec in the 79-85 FSM (rear motor mounting bolt-nut: 16 to 24 ft lbs). \\
For the rest, there is a "General Fastener Tightening Specifications" chart in the 70-78 and 79-85 FSMs. ((1970-1978 HD Sportster XL/XLH/XLGH/XLT-1000 FSM pg 1-13)) \\
It lists general torque values for bolt types but not specific mounting bolts. \\
It also says to torque to these values given in the table unless specified otherwise. \\

{{:techtalk:ref:svcproc:bolt_head_grade_markings.jpg?direct&300|}} ((drawing by Hippysmack)) \\

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|Bolt size|SAE 2 \\ 74,000 psi \\ Low carbon|SAE 5 \\ 120,000 psi \\ Medium carbon \\ heat treat|SAE 7 \\ 133,000 psi \\ Medium carbon \\ alloy|SAE 8 \\ 150,000 psi \\ Medium carbon \\ alloy|Socket head \\ cap screw \\ 160,000 psi \\ High carbon \\ quenched tempered|Socket head \\ set screw \\ 212,000 psi \\ High carbon \\ quenched tempered|Studs|
|#6|-|-|-|-|-|9 in/lb|Use \\ SAE \\ 2,5 and 8 \\ values \\ when \\ grade \\ is known \\ with nut \\ and \\ sufficient \\ strength|
|#8|-|14 in/lb|-|-|-|16 in/lb|:::|
|#10|-|22 in/lb|-|-|-|30 in/lb|:::|
|1/4"|6 ft/lb|10 ft/lb|13 ft/lb|14 ft/lb|16 ft/lb|70 in/lb|:::|
|5/16"|12 ft/lb|19 ft/lb|25 ft/lb|29 ft/lb|33 ft/lb|140 in/lb|:::|
|3/8"|20 ft/lb|33 ft/lb|44 ft/lb|47 ft/lb|54 ft/lb|18 ft/lb|:::|
|7/16"|32 ft/lb|54 ft/lb|71 ft/lb|78 ft/lb|84 ft/lb|29 ft/lb|:::|
|1/2"|47 ft/lb|78 ft/lb|110 ft/lb|119 ft/lb|125 ft/lb|43 ft/lb|:::|
|9/16"|69 ft/lb|114 ft/lb|154 ft/lb|169 ft/lb|180 ft/lb|63 ft/lb|:::|
|5/8"|96 ft/lb|154 ft/lb|215 ft/lb|230 ft/lb|250 ft/lb|100 ft/lb|:::|
|3/4"|155 ft/lb|257 ft/lb|360 ft/lb|380 ft/lb|400 ft/lb|146 ft/lb|:::|
|7/8"|206 ft/lb|382 ft/lb|570 ft/lb|600 ft/lb|640 ft/lb|-|:::|
|1"|310 ft/lb|587 ft/lb|840 ft/lb|700 ft/lb|970 ft/lb|-|:::|


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Trace: • REF: Engine Mechanicals - Sub-01G • REF: Tools & Fasteners • REF: Engine Mechanicals - Sub-05K • REF: Gears, Sprockets, Belts - Sub-01A • IH: Carburetor, Intake Manifold & Exhaust - Sub-01C • REF: Engine Mechanicals - Sub-01M • REF: Engine Mechanicals - Sub-05D • REF: Engine Mechanicals - Sub-04K • REF: Engine Mechanicals - Sub-04P • REF: Tools - 145