TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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APPENDIX E GENERAL TORQUE LIMITS TM9-2815-202-34 REQUIRED FOR FASTENERS IN ENGINE E-1. GENERAL This section provides the general torque limits for fasteners used on the 8V71T series engines. Special torque limits are indicated in the maintenance procedures for applicable components. These general torque limits cannot be applied to fasteners that retain rubber components. The rubber components will be damaged before the torque limit is reached. E-2. TORQUE LIMITS Table E-1 lists dry torque limits. Dry torque limits are used on fasteners that do not have lubricants applied to the threads. No wet torques are given because all wet torques are listed in the maintenance procedure. The torques given are suitable for grade 5, 5.1, 7, and 8 fasteners. No grade 1 or 2 fasteners are used on an 8V71T series engine. E-3. HOW TO USE THE TORQUE TABLE a. Measure the shaft diameter of the fastener and count the number of threads per inch. b. Under the heading THREAD SIZE, look down the column until you find the diameter and threads per inch of the fastener. Next, look across that row and read the torque limit in Ib-ft or N-m. Table E-1. Torque Limits for Dry Fasteners THREAD SIZE TORQUE LIMIT inches Ib-ft N-m 1/4-20 1 /4-28 5/16-18 5/16-24 3/8-16 3/8-24 7/16-14 7/1 6-20 1/2-13 1/2-20 9/1 6-12 9/16-18 5/8-11 5/8-18 3/4-10 3/4-16 7/8-9 7/8-14 1-8 1-14 8-10 13-17 15-19 30-35 35-39 46-50 57-61 71-75 83-93 90-100 107-117 137-147 168-178 240-250 290-300 410-420 475-485 580-590 685-695 10-12 11-14 18-23 20-26 41-47 47-53 62-68 77-83 96-102 113-126 122-136 146-159 186-200 228-242 325-339 393-407 556-569 644-657 786-800 928-942 E-1/E-2 Blank