TM 5-4310-379-145-11. Fuel Injectors (Cont).NOTEBe sure that no compound is accidentally placed on the lapped surfaces located higher up in thespray tip. The slightest lapping action on these surfaces can alter the near-perfect fit betweenneedle valve and tip.(ac)Inspect the needle valve seat area in spray tip (10) for dirt or foreign material. Polish the seat areawith polishing stick.(2)Assemble. (figure 5-7)NOTEThe sealing surfaces on all used injector parts should be lapped before installation.(a)Install fuel filter (1), two gaskets (2) and two filter caps (3).(b)Purge filter after installation by directing compressed air or fuel through the filter caps.(c)Install clean shipping caps on filter caps.(d)Install rack (4) in injector body (5). Look through bottom bore of injector body (5) until two markedteeth are visible and install gear (6) so that marked tooth on gear (6) is engaged between twomarked teeth on rack (4).(e)Install gear retainer (7).(f)Using injector nut seal ring protector, install seal ring (8) on injector body (5).(g)Install bushing (9) in injector body (5).(h)Install spill deflector (10) over barrel of bushing (9).(i)Install check valve (11) centrally on top of bushing (9).(j)Install check valve cage (12) over check valve (11) and against bushing (9).(k)Install spring seat (13) in spring (14) and install spring (14) in spring cage (15).NOTEInstall new spring seat when using a new design spray tip.(I)Install spring cage (15) on bushing (9).NOTEIf installing a new design spray tip, a new valve spring seat must also be installed.5-24
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