TM 5-6115-400-12
tube and fuel return manifold nuts
Caution: Cover all fuel openings to
securely.
prevent the entrance of dirt.
(5) Start the engine and observe fuel injection
tubes
and
fuel
return
manifold
(7) Remove the nut and washer securing the
connections for fuel leakage. Correct any
nozzle-holder clamps and remove the
leaks found.
clamps.
(6) Make certain that the rocker cover
(8) Using a small pry bar, pry upward on the
gaskets are in good condition and install
nozzle protection cap and pull the nozzles
the valve rocker covers. Install the rocker
from the cylinder heads.
cover sealing washers and the rocker
cover capscrews.
Caution: Use care when removing an
injection nozzle to prevent striking
3-34. Fuel Transfer Pump
nozzle tip.
a. The fuel transfer pump (fig. 3-27) is mounted
directly on the fuel injection pump. The purpose of the
(9) Cover the openings in the cylinder heads
transfer pump is to supply fuel, under low pressure, to
to prevent the entrance of dirt.
the fuel gallery of the injection pump.
(10) Refer to figure 3-26 and remove carbon.
b. Periodically, the fuel transfer pump should be
d. Installation.
removed and inspected, as follows:
(1) Thoroughly clean the inside of the nozzle-
(1) Disconnect the fuel lines from the fuel
holder sleeves before installing the
transfer pump. Remove the nuts and
nozzle-holder.
When cleaning nozzle
washers attaching the pump and remove
sleeve, make certain that the old nozzle-
pump.
holder gasket is removed from the sleeve
(2) Connect a piece of tubing to the fitting on
as a new gasket must be used when
the inlet side of the pump and place the
installing nozzle-holder. Make sure that
free end of the tubing in 'a container of
no small particles of carbon are present in
CLEAN diesel fuel.
the nozzle sleeve which would prevent the
nozzle-holder
gasket
from
seating
(3) Work the tappet assembly in and out, by
properly, thereby permitting "blow-by"
hand until fuel flows from outlet side of
from the cylinder.
the transfer pump. If a solid flow of fuel
does not emerge from the outlet opening,
(2) Place a new nozzle-holder gasket,
weak valve springs and/or worn or
concave face down, in position on nozzle-
damaged valves or valve seats are
holder and carefully insert nozzle-holder
indicated.
into position in the injection nozzle sleeve
in the cylinder head.
(4) Disassemble the transfer pump and
inspect the components. If the valve
(3) Install the nozzle-holder clamp, and the
seats are damaged in any way the
washer and nut for each nozzle but do not
transfer pump must be replaced as a unit.
tighten at this time.
Install the fuel
injection tubes, inserting one end of the
tubes into the injection line connectors,
3-35. Electrical Fuel Pumps
then inserting the other end of the tubes
into position in the injection nozzle-
Refer to figure 3-28 and service the electric fuel
holders. Start the injection tube nuts but
pumps.
do not tighten at this time. Install the fuel
return manifold.
3-36. Fuel Tank
(4) Tighten the 3/4 inch nozzle-holder clamp
Refer to figure 3-29 for removal and installation of fuel
nuts to a torque of 21 to 24 foot-pounds.
tank.
Tighten the injection
3-34