TM 9-2910-226-34 NOTE If the injection pump is to be tested after assembly, do not tighten the overflow valve or plastic tubing until the fuel leakage and timing check as described in paragraphs 3-50 through 3-58 has been performed. Figure 3-150. Installing fuel control unit assembly on metering and distributing fuel injection pump. Figure 3-152. Installing overflow valve assembly 3-46. Installation of Fuel Density Compensator. a. Installation of Fuel Density Compensator (Code B, C, D, E and F pumps). Refer to figure 3-153. Posi- tion a new mounting gasket (G) on governor housing. Position fuel density compensator on governor housing and secure with four ¼ x 1¼ capscrews (E) and four ¼ inch lockwashers (F). Torque tighten screws 50-60 inch-pounds. Install density compensator to overflow valve tubing (E, fig. 3-152). Connect tubing (A) to elbow (C). Install tubing (H) to tee (D) and elbow in hydraulic head (B). Figure 3-151. Installng control unit retainer. 3-45. Installation of Overflow Valve Assembly. a. General. Refer to figures 3-38, 3-39 or 3-40 for selection of the proper overflow valve assembly. b. Installation, Refer to figure 3-152. Install lock- washer (A) and stet nut (B) on advance unit shaft. Tighten nut finger tight. Install overflow valve assembly (C) in position on hydraulic head. Figure 3-153. Installing fuel density compensator assembly. 3-87