Quantcast Figure 4-25. Adjusting maximum no-load speed.

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TM 55-1905-217-12
(8)  Disconnect the fuel rod from the injector
control tube and manually hold the No. 1 injector in the
full-fuel position and turn down the inner adjusting screw
of the No. 2 injector until the injector rack has moved into
the full-fuel position and the inner adjusting screw is
bottomed on the injector control tube. Turn the outer
adjusting screw down until it bottoms lightly on the
injector control tube. Then, alternately tighten both the
inner and outer adjusting screws.
(9)  Recheck the No. 1 injector rack to be sure
that it has remained snug on the ball end of the injector
rack control lever while adjusting the No. 2 injector. If the
rack of the No. 1 injector has become loose, back off
slightly on the inner adjusting screw on the No. 2 injector
track control lever and tighten the outer adjusting screw.
When the settings are correct, the racks of both injectors
must be snug on the ball end of their respective rack
control levers.
(10) Position the remaining injector rack control
levels as outlined in steps 8 and 9.
Figure 4-25. Adjusting maximum no-load speed.
(11) Connect the fuel rod to the injector control
tube lever.
until the engine is operating at approximately 15 rpm
(12) Turn the 'idle speed adjusting screw until it
below the recommended idle speed. The recommended
projects 3/8-inch beyond the locknut.
Tighten the
idle speed is 550 rpm.
(3)  Hold the idle screw and tighten the locknut.
(4)  Install the high speed spring retainer and
c . Adjusting Maximum No-Load Engine Speed.
retain with the two bolts.
All governors are properly adjusted before leaving the
e. Adjusting Buffer Screw. With the idle speed set,
factory. However, if the governor has been reconditioned
adjust the buffer screw as follows:
or replaced, and to ensure the engine speed will not
(1)  With the engine running at normal operating
exceed the recommended no-load speed as given on the
temperature, turn the buffer screw (fig. 4-26) in so that it
option plate, the maximum no-load speed may be set as
contacts the differential lever as lightly as possible and
still eliminates "engine roll".
(1)  Loosen the locknut (fig. 4-25) and back off
the high speed spring retainer approximately five turns.
(2)  With the engine at operating temperature
Do not increase the engine idle speed more than
and no-load on the engine, place the speed control ,lever
115 rpm with the buffer screw.
in the full-fuel position. T-urn the high speed spring
(2)  Hold the buffer screw and tighten the
retainer IN until the engine is operating at the
recommended no-load speed.
(3)  Recheck the maximum no-load speed. If it
(3)  Hold the high speed spring retainer and
has increased more than 25 rpm, back off the buffer
tighten the locknut.
screw until the increase is less than 2-5 rpm.
Adjusting Idle Speed. With the maximum no-
load speed properly adjusted, adjust the idle speed as
432. Engine Throttle Controls
a. Each propulsion unit consists of two engines
(1)  Remove the spring housing to uncover 'the
connected by clutches to a common gear box. The
idle speed adjusting screw.
throttle adjustment is made so that each engine of a twin
(2)  With  the  engine  at  normal  operating
unit will carry its share of the load.
temperature and with the buffer screw (fig. 426) backed
out to avoid contact with the differential lever, turn the
idle speed adjusting screw


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