Table 6-3. Fuel Pump Calibration Specifications and Technical Data
Lower Throttle Shaft Rotation
Counterclockwise to open
Upper Throttle Shaft Rotation
Clockwise to open
Test Oil Temperature
90 to 100F (32 to 38C) 135F (57"C)
426 to 444 lbs/hr (192 to 200 kg/hr)
Fuel Rail Pressure
176 to 194 psi (1214 to 1338 kPa) at 1800 rpm
Lower Governor Cut Off Speed
2010 to 2040
Upper Governor Cut Off Speed
1910 to 1940 rpm
at 1800 rpm
Idle Speed Flow
310 ±15 cc/min. at 600 rpm
Throttle Travel (Rotation)
27 to 29 degrees
185 psi (1276 kPa)
1275 lbs/hr (575 kg/hr)
Check Point Pressure
137 to 143 psi (945 to 986 kPa)
Check Point Flow
1080 lbs/hr (486 kg/hr)
If the fuel pressure is more or less than this proceed as follows:
Check that the correct high speed governor spring (12, Figure 6-11) has been installed, and that the
high speed governor spring is seated properly. Governor spring shims (10) may be added or removed
in accordance with step c(7), above. If the high speed governor spring (12) is replaced, or If governor
spring shims (10) are added or removed, the fuel pump must be recalibrated commencing with step b,
Check the protrusion of the shoulder pin (1, Figure 6-12) in accordance with paragraph 6-10, step f.
Shims (2) may be added behind the shoulder pin (1) if the fuel pressure is less than 137 to 143 psi
(945 to 986 kPa), or removed if the fuel pressure is more than this. Shims (2) are available in 0.007
and 0.015 inch (0.18 and 0.38 mm) thicknesses.
Once fuel pump testing and calibration is completed, reset the shutoff valve (Figure 6-10), (set open in
step b (4), above) to is original closed position by turning the knob (2) counterclockwise as far as it will go.
Do not force.
The throttle shaft (45, Figure 6-11) may now be locked in the fully open position (rotated fully
counterclockwise). During engine operation engine speed will be automatically controlled by the electric
governor control (Figure 6-30) and the actuator (4, Figure 6-5). Loosen the hexagonal nut (54, Figure 6-
11), located towards the rear of the fuel pump housing (66), and turn in the corresponding adjusting screw
(55) until it contacts the control end (51). The control end (51, Figure 6-11) should now be fixed between
the adjusting screw (55), located towards the rear of the fuel pump housing (66), and the adjusting screw
(55), located towards the front of the fuel pump housing. Lock the adjusting screw (55), by tightening the
hexagonal nut (54).
Remove the locking pliers and universal spring from the throttle shaft (45, Figure 6-11), and from the
throttle shaft (30, Figure 6-11), if not ready removed in step c (11), above.
Replace the throttle shaft cover (43) on the fuel pump housing (66) with the rivets (42).
Disconnect the fuel supply, outlet, and return hoses (5, 1, and 3, Figure 6-16) from the fuel pump, and
remove the fuel pump from the pump drive adapter (2, Figure 6-15).