TM 9-2910-220-34 A Housing cover F B Supply pump housing G C Camshaft driven gear H D Drive shaft J E Idler gear K Check valve spring Check valve Valve screw Relief valve Relief valve spring Figure 1-21. Fuel supply pump assembly (code A and F), sectional view. 1-15. Fuel Supply Pump Assembly (Code B, C, D, E, late F and G Injection Pumps). NOTE The key letters shown below in parentheses refer to figure 1-22. a. The fuel supply pump assembly consists of the supply pump (B), camshaft driven gear (C), drive shaft (D), idler gear (E), housing cover (1), and check valve (G). b. The supply pump housing contains inlet and outlet ports for fuel. c. The housing cover and cavity in the supply pump housing form a compartment in which the idler gear and drive shaft rotate. d. Rotation for the supply pump drive shaft (D) is imparted by the fuel pump camshaft through the camshaft driven gear (C). A Housing cover E Idler gear B Supply pump housing F Check valve spring C Camshaft driven gear G Check valve D Drive shaft H Valve screw Figure 1-22. Fuel supply pump assembly (code B, C, D, E, late F and G), sectional view. 1-16. Timing Device Assembly. NOTE The key letters shown in parentheses refer to figure 1-16. a. The timing device housing (AD) is an aluminum casting with mounting flanges at both ends. A bore in the housing guides and supports the spider assembly (AH). A timing opening with cover (E) is located in the top of the housing and is used to observe the position of the timing pointer (D) and the timing mark on timing device hub (C) during enging and fuel pump timing. b. The timing device hub (c), with external left hand helical splines for engaging the internal helical splines of the sliding gear (A), has a tapered bore and keyway. The hub is secured to the camshaft extension by a Woodruff key, nut, and setscrew. Old style hubs have a circular flange extending 1-23