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The tram gauge (fig. 8-57) is a metal rod or shaft with two pointers, used to compare the distance between the front and rear of the tires of the vehicle for toe adjustment. The pointers slide on the gauge so they can be set to the distance between the tires. The tram gauge will indicate toe-out or toe-in in inches or millimeters. The procedures for using a tram gauge for measuring toe are as follows: Raise the front wheels of the vehicle and rub a chalk line all the way around the center rib on each tire.
Figure 8-57.- Tram gauge. With a scribing tool, rotate each tire and scribe a fine line on the chalk line. This will give you a very thin reference line for measuring the distance between the tires. Lower the vehicle back on the turning radius gauges. Position the tram gauge at the back of the tires. Move the pointers until they line up with the scribe marks on the tires. Without bumping the tram gauge pointers, reposition the gauge to the front of the tires. The difference between the lines on the front and rear of the tires shows toe. If the lines on the front of the tires are closer together than on the rear, the wheels are toed-in. If the lines are the same distance apart at the front and rear, toe is zero. Use the manufacturer's service manual for specifications and adjustment procedures. |
 
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