ARMY TM 9-2815-253-24
AIR FORCE TO 38G1-93-2
MARINE CORPS TM 2815-24/3
If original shim thickness is not known or if fuel pump is being replaced, fuel pump must be timed. Refer to
Gently insert fuel pump and shims into crankcase. Ensure that fuel pump rack engages with slot in governor
If fuel pump is not turned counterclockwise or moves before tightening, it is possible that engine will
not stop when required.
Carefully turn fuel pump counterclockwise until pump rack is felt against stop.
Holding pump in this position, install damp (2) and secure with nut (1) (beveled face towards clamp) finger tight.
Tighten nut to 25 ft-lbs (33.9 Nm).
Install fuel injector pipe between pump (5) and fuel injector. Refer to paragraph 3-18.
Connect fuel supply line (11) to fuel injection pump using damp (4).
Remove rack setting gage.
Connect governor lever to rack spring (15, FIGURE 3-19).
Install gear end cover. Refer to paragraph 3-28.3.
3-14. FUEL INJECTION PUMP TIMING.
Cleaning solvent Is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye protection
required. Avoid repeated/prolonged contact. Good general ventilation Is normally adequate.
Each fuel injection pump is timed individually during assembly at factory and when an existing or new fuel injection
pump is installed, it is only necessary to reinstall existing shim pack or a new pack of same thickness as original. This
procedure is necessary only if original shims have been lost or mixed with those of another pump. Use care to avoid dirt
entering into engine during fuel injection pump timing procedure. If practical, start with a thorough cleaning. Use dry
cleaning solvent (P-D-680) to remove all external dirt. For each fuel injection pump to be timed, repeat following
Remove cylinder head cover and fuel injector. Refer to paragraphs 3-25.1 and 3-17.1.
Turn engine over manually to establish TDC between compression and power strokes for cylinder being timed.
Normal engine direction of rotation is clockwise as viewed from the fan end. Correct top center occurs
approximately 140 degrees of crankshaft rotation after intake valve closes.
Remove intake valve rocker lever nut and rocker lever. Refer to paragraph 3-26.1.
Do not stand over valve springs when depressing valves. Failure to observe this warning could
result in personal Injury.
Using valve spring tool, depress intake valve until it contacts the piston crown (approximately 0.051 to 0.059
inches [1.3 to 1.5 mm]). Then remove collets, carrier, and spring from intake valve.
If valve can be depressed more than approximately 0.25 in. (6.35 mm), piston is not in correct
position. Engine should be rotated to correct position to avoid possibility of dropping valve into
cylinder once carrier and spring are removed.
Valve can now be depressed until head of valve rests on top of piston. Refer to FIGURE 3-10.