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 manufacturers 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

Figure 2-12.Torque adapters.

Figure 2-13.Torque adapters and points of measurement.

An easy to remember rule of thumb is that the applied torque will be greater than the indicated torque by an amount equal to the length of the adapter compared to the length of the torque wrench. For example, if the adapter is the same length as the torque wrench, the applied torque will be twice as great as the indicated torque. If the adapter is one-third as long as the torque wrench, the applied torque will be one-third greater than the indicated torque.

Figures 2-14 and 2-15 illustrate how to calculate applied torque.