A fuel inlet stud can be fabricated with a 1/4 -18
NPT pipe die. High pressure tubing must be
used between the Nozzle Test Stand and the
Always check to make sure that all external con-
nections are tight and that the Nozzle Test Stand
is in good order.
(8) Slowly operate the Nozzle Test Stand until a
pressure of 400 psi is achieved. A rapid drop in pressure
indicates that a leak is present. The pressure must remain
above 250 psi for at least 30 seconds.
DO NOT EXCEED A PRESSURE OF 400 PSI.
(9) Visual inspection should be as follows:
(a) Check for leakage by the head locating screw
(13, figure 7-34).
(b) Slight leakage by control unit shaft is normal
and is necessary to lubricate shaft. Fuel leakage between
the control unit body (4) and pump housing (6) indicates
that either the O ring (33 ) is damaged or the mating
surfaces are damaged. Replace the O ring (33 ) and re-
test the pump. If fuel leakage is excessive at control unit
shaft or continues past O ring (33) replace defective
(c) Check for leakage of fuel around the face gear
(28 ). If leakage is evident, disassemble pump and inspect
O ring (19).
(d) Check for fuel leakage between top of housing
and head flange. To correct, disassemble and replace
upper hydraulic head O ring (18).
f. Install (Method 1).
(1) Turn engine flywheel to the port closing mark
(PC) on the front cylinder (closest to blower wheel) com-
pression stroke (see figure 7-44 ).
(2) Remove timing hole screw located on pump
mounting flange (figure 7-42). Insert a 1/8 inch diameter
wire into the hole.
(3) Rotate pump face gear until wire slips into place,
locking the gear in position.
(4) Mount pump on crankcase (see figure 7-32) (be
sure shims (5) are in place) and secure in position using
four hexagon nuts (2), flatwashers (4) and Iockwashers
(3). If O ring seal between pump and crankcase is worn,
cracked or otherwise defective, replace it.
(5) Remove wire. Install timing hole screw and
Figure 7-42. Injection Pump Installation
g. Install (Alternate Method 2).
(1) If pump was not timed by method 1, time now
using alternate method 2 below.
(2) Connect flexible fuel inlet line to pump inlet.
Connect fuel return line.
(3) Connect each fuel outlet line to the proper pump
outlet (see paragraph 7-2).
(4) Connect governor linkage to governor arm.
(5) Start and run engine. Adjust governor linkage if
required (see paragraph 7-3).
A maximum trottle stop screw, located on the
injection pump control assembly, limits the max-
imum amount of fuel which can be injected into
the engine. This screw should not be tampered
with; it has been properly adjusted at the factory
to protect the engine from over-fueling (see
h. Adjust/Time on Equipment.
(1) Time the injection pump to the engine by using
the proper thickness timing button between pump plunger
and tappet (see figure 7-33). Use method 1 when replacing
an old pump if the port closing dimensions and bottom
number of the old pump were recorded. Use method 2 if
the dimensions are lost, an old pump is being timed, or
when replacing either the camshaft or crankshaft.
7 - 3 8