TM 5-4310-452-14APPENDIX FTORQUE LIMITSF-1. ENGINE TORQUES.a.To prevent faulty assembly, the following information includes instructions on the tightening of heavy-duty bolts.Because the procedure differs from that normally employed, the tightening angle is particularly important. The variousangles can be readily obtained by comparison with a clock face.b.To obtain the desired angle, the handle extension of the wrench must be turned by the same angle as thatformed by the hour and minute hands of a clock. The 60° angles of a hex head bolt can also be a help.(1)Wet threads and seatings with motor oil before fitting.(2)Screw the bolts in until they are squarely seated, using a socket wrench without handle extension or a boxor ordinary wrench without making use of the leverage.(3)Preload the bolts by holding the handle extension so that both hands are in contact with the wrench. Whenusing a box or ordinary wrench for preloading, the tip of your straight thumb holding the wrench must touch the head ofthe bolt, (4) Tighten the bolts according to Table F-1, if necessary in stages, in conformity with the tightening anglesspecified,TA505617F-1
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