TM-9-2815-200-35

ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)

TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

TM-9-2815-200-35 - Page 498 of 779

Note.

Components of the fuel check valve ar e

not available as replacement parts. Therefore, no

further disassembly is required .

Figure 6-242. Deleted .

b. Cleaning, Inspection and Repair.

Refer t o

paragraphs 6-2, 6-3, and 6-4 .

c.

Assembly.

Refer to figure 6-241 .

d. Test and Adjustment

(fig. 6-243) .

(1) Fill valve with test fluid, MIL-F-7024 A

Type II, and apply a pressure of ½ psi to por t

marke d

“FREE FLOW” (fuel inlet fro m

primary fuel filter). The check valve must open

at this pressure . Valve operation can be deter -

mined when fluid flows from the fuel pum p

outlet port .

(2) Apply a pressure of 85 to 95 psi to the

heater pump inlet port. The check ball mus t

bypass fluid at this pressure. Adjust socket head

adjusting screw (F, fig. 6-242) to obtain thi s

opening pressure .

(3) Plug the fuel pump outlet port, and the

heater pump outlet port, and apply a pressure o f

100 psi at heater pump inlet port. There should

be no fuel leakage from the “FREE FLOW ”

port .

(4) If the valve fails to pass either test ,

replace entire valve assembly .

Figure 6-243. Fuel check valve flow diaphragm .

6-204