TM 9-2320- 209-20-3-1 FRAME 11 1. Set top of lower stack pipe (1) to extend l-inch above U-bolt (2) as shown. 2. Using l/2-inch wrench, tighten two locknuts (3). 3. Loosen two locknuts (4) as needed, and put upper stack pipe (5) on lower stack pipe (1) . Make sure upper stack pipe is firmly seated. NOTE Install upper stack pipe (5) so outlet (6) is out and back. The angle from truck centerline should be 45°. 4. Using 1/2-inch wrench, tighten two locknuts (4) . GO TO FRAME 12 7A 047247 5-74