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Ridge Reamer

Engineman 2 - Intermediate engine mechanics training manual
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of threaded fasteners. Figure 2-l1 shows three types of torque wrenches. To use a torque wrench, first select the proper torque value for the torquing procedure you are using. Next, Figure 2-10.—A typical stroboscope. Figure 2-11.—Typical torque wrenches. select the torque wrench with the correct capacity. The torque value should be in the second or third quarter of the  wrench’s  torque  scale  because  the  first  and  last quarters of the scale are not as accurate as the middle quarters. Torque wrenches are precision tools. Handle them with care and always follow the manufacturer’s manual when you use them. TORQUE MULTIPLIER Torque  multipliers  are  geared  devices  attached  to the torque wrench to increase the force of torque. The most preferred ratio of the torque multiplier is 4 to 1. To use  a  torque  multiplier,  select  one  with  an  output capacity above the required torque. Be sure to follow the manufacturer’s  operating  manual  to  avoid  personnel injury and damage to the equipment. TORQUE ADAPTERS Torque adapters allow the torque wrench to be used to tighten parts and fasteners other than standard nuts and bolts. Adapters are available in a variety of shapes geared  to  the  repair  of  different  parts  of  the  diesel engine. Several types of torque adapters are shown in figure  2-12. When  you  use  an  extension  adapter,  the  torque applied to the part or fastener will be greater than the torque indicated on the torque wrench. Therefore, you must account for the length of the adapter to apply the proper   torque   to   the   part   or   fastener.   Figure   2-13 illustrates the points of measurement. The torque applied by the adapter is directly related to the length of the adapter. As the length of the adapter increases, so does the applied torque. To determine the actual torque applied to the part or fastener, assume that the length of the torque wrench is L and the length of the adapter is A. Assume also that Tw  is  the  torque  indicated  on  the  scale  of  the  torque wrench and Ta is the torque exerted at the end of the adapter. To  determine  Ta,  simply  multiply  the  torque indicated on the torque wrench (Tw) by the ratio of the total  effective  length  of  the  assembly  (L  +  A)  to  the length of the torque wrench (L). or 2-7







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