After each droop adjustment, check full-
load delivery and reposition the throttle
lever slightly as needed to compensate
for any change in full-load fuel delivery.
(d) Disconnect vernier rack positioner.
Hold throffle lever as far open as it will go with
high- speed adjusting screw backed out. Increase
test stand speed to 10 percent above full-load
speed (900 rpm).
(e) Turn high idle adjusting screw in (clock-
wise) until fuel delivery is 20-25 percent of full-load
quantity (900-990 rpm).
Lock adjusting screw in this
position. This prevents accidental overspeeding in
the event that speed droop needs further adjustment
Do not change droop setting.
(f) Seal all throttle and shut-off lever ad-
justing screws with lead plomb.
(g) If fuel pump is to be used for 400 Hz
application, reset high idle speed screw to 1125 rpm.
(17) Speed droop adjustment installed on engine
(60 HZ application).
(a) after priming fuel system, start and
warm engine to operating temperature.
(b) with full-load applied and engine opera-
ting at rated speed, droop may be determined by re-
moving load and noting no-load speed or frequency.
(c) Droop may be adjusted by turning knob
clockwise to increase, counterclockwise to decrease.
A minor correction of throttle position will also be
14-49. Fuel Pump Installation, Fuel Pump and
a. Insure that the number 1 piston is on its com-
This can be determined by removal
of the cylinder head cover so valve action can be ob-
(1) Bar the engine over by hand until number 6
cylinder exhaust valve is nearly closed and number 6
cylinder intake valve is just beginning to open. This
will position number 1 cylinder near the top of its
(2) To be sure that all slack is out of the timing
gears, back up the engine (counter clockwise) past the
24° BTDC timing mark and again come up to the tim-
ing mark (24° BTDC) in the direction of normal engine
rotation (clockwise when viewed from the front) (fig.
14-25, View A).
During assembly of the engine or replacement
of any of the timing gears it is necessary to
align the timing marks as indicated in (fig.
14-25, View B).
b. Remove timing window cover from the fuel in-
With a clean, wide bladed screwdriver
or the pump drive shaft inserted into the drive end of
the pump rotate the distributor rotor until the timing
line on the weight retainer hub registers with the line
on the cam as indicated in (fig. 14-25, View C).
c. Install drive shaft by greasing shaft seals with
Do not roll seals over as shaft is in-
serted into pump.
Slot in pump end of shaft should
mate with tab on pump rotor pin.
d. Mount fuel pump and adapter in position on
engine and secure pump and adapter with mounting
New injectipn pumps received from supply
have a high idle adjustment of 1860 rpm for
60 HZ applications. Installation on 400 HZ
generator sets requires resetting the high
speed adjustment screw (12, figure 14-24) to
2250 rpm. Adjustment is accomplished using
an engine speed tachometer with actuater
rod (3, figure 13-1) disconnected, the shutoff
lever, (21, figure 14-21) in the on-fuel condi-
tion then manually operating the throttle
lever, (32, figure 14-21) against high speed
e. Connect throttle and shut-off linkage.
f. Connect fuel supply, return, nozzle leak-off
lines and High pressure lines.
g. Before installing fuel pump drive gear, inspect
fuel pump drive shaft and remove any burrs if
h. Install woodruff key and coat fuel pump drive
shaft with engine oil.
i. Position fuel pump drive gear on shaft so keyway
in gear lines Up with the woodruff key.
j. Install nut and lockwasher to secure drive
gear and tighten to torque of 35 to 40 foot-pounds.
k. Replace thrust button and spring on drive
J. Replace timing gear inspection cover.
14-50. Equipment Test.
If the fuel injection pump has been repaired or re-
placed refer to Chapter 16, Section II and conduct
the following equipment tests.
14-56 Change 6