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n <br />OPW Installation, Operation, and Maintenance Manual, Page 59 <br />STEP 11: PREPARE DRILL AND BIT <br />Confirm that the stop on the 3/16" drill bit supplied <br />with the 71 SO -TOOL is in the correct position before <br />drilling. The stop is factory installed at a distance <br />between 2" to 2-1/16" from the tip. If the stop is not <br />at the correct position it must be fixed before drilling. <br />Caution: If the drill stop is not in the proper <br />location failure of a pressure decay leak test may <br />result. <br />Tip to stop dimension <br />must be 2 to 2-1/16 inch <br />Figure 11 <br />STEP 12: DRILL HOLES <br />With the inlet tube and 71SO-TOOL in place, <br />carefully drill a 3116" diameter hole in the upper tube <br />using the drill bushing in the knob as a guide. The <br />drill stop is positioned so it will bottom out against <br />the knob after the bit has drilled through the upper <br />drop tube. If the stop is positioned wrong either no <br />hole will be drilled, or a through hole could <br />potentially be drilled through the inlet tube. If no <br />hole is drilled return to step 11 and check the stop <br />dimension. If a hole is drilled through the inlet tube <br />the assembly is not salvageable. Drill (2) more <br />holes in the two remaining knobs. <br />Drill thru upper <br />tube only <br />Figure 12 <br />11 <br />Executive Order VR -1 02-K <br />STEP 13: DIMPLE FIRST HOLE <br />Unthread one knob completely from the tool. <br />Remove any chips or burrs from the drilling <br />operation. Place the assembly on a solid surface <br />keeping the other two knobs in place. Using the <br />punch supplied with the 71 SO -TOOL align the tip of <br />the punch with the drilled hole and dimple the upper <br />drop tube by striking the punch with a hammer until <br />drop tube is formed into countersunk hole in inlet <br />tube. After punching, remove any chips that may <br />have fallen into the inlet tube screw hole. <br />Align punch with <br />drilled hole <br />Figure 13 <br />STEP 14: ASSEMBLE FIRST SCREW <br />Ensure that the drop tube was formed into the <br />countersunk screw hole as shown in Figure 14 if not <br />return to step 13. Apply black moly grease to screw <br />and tighten first screw into inlet tube with a <br />screwdriver. Use only the taptite screws that are <br />supplied with the unit. Seating torque is 20 in -lbs <br />min. to 35 in -lbs max. Screw head should be flush <br />with the drop tube. Do not over tighten. <br />Figure 14 <br />Ensure drop tube is formed into <br />countersunk hole <br />OPW 71 SO Overfill Prevention Valve Page 8 <br />