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Page T2
.\{ echanica/ Governor-continued
i)
W ARNING.
In no circumstances should any
attempt be made to increase idling speed with the
idling spring control screw.
E. Finally re-check governing from ruIl load,
three-quarter and half load to no load to ensure
the governor is stabIe throughout its range.
SCREW-IDLING CON TROL
(FUEL PUMP)
~
FIG. T3
Field Procedure.
Tbe preliminary settings are as already described
and should be carried out, then proceed as follows.
1. Start engine and warm up to 160cF. (71 cC.).
2. Set lever to running position and check
maximum no laad r.p.m. Such inertia laad as is
available, should then be applied and removed in
rapid succession to check the stability of the
governor. Any necessary correction should be
made as described in Test Bed Procedure, para-
graph C.
3. Carry out operation D in Test Bed Procedure.
4. Finally re-check maximum no laad r .p.m.
and idling r.p.m.
until full laad caD just be obtained at tbe appro-
priate speed. Main spring tension adjustment is
carried out by alteration of the govemor spring
control lever adjusting screw (See Fig. T.4).
C. Gradually remove load, note sustained over-
run speed. If this is satisfactory, regain load and
try a sudden removal to check stability of the
govemor.
Greater stability may be obtained by increasing
tbc effective radius R of tbe spring lever by rotating
thc spring anchorage. Eccentric adjustment be-
tween R. Min and R. Max being obtainable (see
Fig. T.1).
D. Having obtained satisfactory governing, set
lever to idling position and check light load idling
speed. Adjust as necessary on the idling stop
screw (Fig. T.4). Ir it is not possible to reduce
idling speed to tbe required r.p.m. by adjustment
of tbe idling stop screw, it wil! be necessary to
slightly reduce the load in tbe idling spring.
This cao be obtained by screwing out tbe fuel
pump idling spring control screw at tbe TeaT of
the fuel pump (See Fig. T.3).
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