TM 9-2320-387-24-2 32-4. FRAME INSPECTION AND REPAIR (Cont’d) (cl Diagonal (skew) measurement. (1) (2) NOTE The following two steps are alternate procedures to determine if frame rails are skewed. Measure diagonally from one point on right or left string to adjacent point on opposite side string. Compare to the opposite diagonal measurement. If these two measurements differ by more than l/4 in. (6 mm), the two frame rails are skewed. Repeat this procedure at other sets of four measuring points to confirm skew. Record deviations. Position a string across two plumb bob points at corresponding (or end) points of frame rail string. Place a square with one leg coincident with frame rail string. Run a line or string along other side of square as far as opposite frame rail string. Measure deviation of end string and square side line at opposite frame rail string. Any deviation means the two frame rails are skewed and, consequently, the crossmembers are not at square angles to frame rails. A deviation of l/2 in. (12.7 mm) makes a vehicle dog track and it is difficult to align wheels. Record deviations. NOTE If measured frame rails are out of tolerance, notify supervisor. If frame rails are verified to be out of tolerance, vehicle will be classified as unserviceable. STEP 1 LEFT SIDE STRING Dl -D2<1/4 in. (6 mm) (LARGER) (SMAUER] RIGHT SIDE STRING \ UK DEVIATION LIMIT l/2 in. (12.7 mm) 32-7
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