The governor has an identification plate
manifold) and "OUT" (bottom manifold)
located on the control housing, contain-
cast in several places in the side of the
ing the governor assembly number,
cylinder head.
type, idle speed range and drive ratio.
the maximum engine speed, not shown on
The fuel manifold connectors are assem-
the identification plate, is stamped on
bled to the integral fuel manifold cylin-
the option plate attached to the valve
der head, using special steel sealing
rocker cover.
washers, and tightened to 40-45 lb-ft
(54-61 Nm) torque.
C h e c k Governor Operation
A special fitting with a restricted open-
ing is used in the fuel outlet manifold to
Governor difficulties are usually indi-
maintain the proper pressure within the
cated by speed variations of the engine;
fuel system.
however, it does not necessarily mean
that all such speed fluctuations are
caused by the governor. Therefore,
MECHANICAL GOVERNORS
when improper speed variations are pre-
sent, check the engine as follows:
Description
1. Make sure the speed changes are not
the result of excessive load fluctuations.
Horsepower requirements on an engine
may vary due to fluctuating loads; there-
2. Check the engine to be sure that all
for, some method must be provided to
of the cylinders are firing properly. If
control the amount of fuel required to
any cylinder is not firing properly, re-
hold the engine speed reasonably con-
move the injector, test it and, if neces-
stant during load fluctuations. To ac-
sary, recondition it as outlined under
complish this control, a governor is
"Fuel Injector" on page 11C-1.
introduced in the linkage between the
throttle control and the fuel injectors.
3. Check for bind that may exist in the
The governor is mounted on the front
governor operating mechanism or in the
end of the blower and is driven by the
linkage between the governor and the in-
upper blower rotor. This machine is
jector control tube.
equipped with a variable speed mechan-
ical governor.
With the fuel rod connected to the injec-
tor control tube lever, the mechanism
Engines subjected to varying load condi-
should be free from bind throughout the
tions that require an automatic fuel com-
entire travel of the injector racks. If
pensation to maintain a near constant
friction exists in the mechanism, it may
engine speed, which may be changed ma-
be located and corrected as follows:
nually by the operator, are equipped
with a variable speed mechanical gover-
1. If an injector rack sticks or moves too
nor.
hard,
it
may
be
due
to
the
injector
Figure 11C-59. Cylinder Head with Integral Fuel Manifolds
