TM 5-3810-289-34
having a base approximately 4 inches long.
Note: The torque spring determines point of
(a) Place one leg of the depth mike base of
maximum torque. In the engine, therefore, it is important
pedestal across the carrier walls and measure down to
to avoid changing spring characteristics by careless
the front cover gasket surface (no gasket), figure 3-54.
handling or assembly.
Move the depth mike to the opposite side of the carrier
(5) If torque spring is replaced with new
and again measure to the front cover gasket surface
one, see table 2-{(5)r, and refer to fuel pump adjustment
directly across the cover from the previous measurement
(do not turn carrier or cover). Average these two
(6) One type of plunger failure is caused by
measurements.
This procedure is necessary to
excessive heat from contact of the stop collar and sleeve
eliminate any possible influence of uneven carrier wall
during long periods of overspeeding. Plunger stop
heights.
collars machined from glass filled teflon eliminate this
(b) Position the depth mike across the
type of failure
carrier directly over the weight assist plunger. Measure
d. Installation. Refer to figure 3-80.
down to the plunger. Do not depress spring.
(c)
Substract "B" from the average
determined under "A". The result is the weight assist
protrusion.
g. Installation of Drive Cover. Refer to paragraph
3-7. Governor Plunger
a. Removal. Refer to paragraph 3-2.
b. Disassembly.
(1) If necessary, remove torque spring by
twisting spring off shoulder. Do not use a straight pull
which will stretch spring beyond its elastic limit so it has
to be replaced, figure 3-55.
(2) If governor plunger O.D. is worn,
replace as an assembly.
(3) If only thrust washer is worn, drive
retainer pin from plunger and pull governor plunger driver
from plunger, figure 3-56.
Note. The chamfer on small diameter thrust
washer is provided as a relief for fillets of plunger driver.
Figure 3-55. Torque spring removal.
(4) If it is necessary to remove stop sleeve,
press stop sleeve off shaft.
c. Assembly.
(1) If stop sleeve was removed, press stop
sleeve on plunger with notched end going on plunger first
(nothces toward governor barrel), figure 3-55.
(2) Assemble plunger driver through thrust
washer and drive into plunger.
Driver must have
interference fit in plunger.
(3) Drive retainer pin through the plunger
and plunger driver.
Note. The chamfered side of thrust washer must
be installed next to driver. There must be at lest O.00 to
0.006 inch clearance between washer face and driver so
washer will "float", figure 3-57.
Caution: The plunger has a lubricate finish.
Protect it by laying the plunger on a copper-jawed
vise a V-block to prevent damage to the finish when
installing pin.
Figure 3-56. Governor plunger driver removal.
(4) Install torque spring and shims as
required, put the small end of the spring on the shoulder
end of the plunger with a twisting motion to avoid
distorting the spring.
3-20
