2.7.1 Limiting Speed Governor
DETROIT DIESEL 53
IMPORTANT: Punch mark the carrier at the
lock nuts, and other parts of the control housing for
retainer end of the weight pins so the pins may
defects that might affect the governor operation.
be placed in the proper position when
reinstalling the weights in the carrier.
Assemble Governor Cover
NOTE: Drive the pins out of the carrier from
the weight pin retainer end.
1. Place a new seal ring to the counterbore of the cover
4. Slide the riser and bearing assembly from the shaft.
NOTE: The single lever cover has the seal ring
Do not disassemble the bearing since the riser and
at the top of the cover. The double lever cover
bearing are serviced only as an assembly.
has the seal ring at the bottom of the cover.
2. Lubricate the speed control shaft with engine oil,
then slide the shaft through the cover. Install the
Immerse all of the governor parts in a suitable
washer and retaining ring on the shaft.
cleaning fluid to loosen and remove all foreign
3. Place the speed control lever over the shaft and
material. Use a bristle brush and compressed air as
secure it with the bolt and lock washer.
necessary to ensure cleanliness of all parts.
4. On double lever covers, lubricate the stop lever shaft
Examine the bearings for any indications of corrosion
with engine oil, then slide the shaft through the cover.
or pitting. Lubricate each bearing with light engine
oil; then, while holding the bearing inner race from
5. Place the seal ring in the counterbore of the shaft
turning, revolve the outer race slowly by hand and
opening, then install the washers over the shaft. Lock
check for rough spots. Replace the bearings if rough
the shaft in place with the retaining ring.
or tight spots are detected.
6. Place the stop lever on the shaft and secure it with
The lower governor drive components have been
the bolt and lock washer.
revised to reduce the clearance between the riser and
the weight shaft. With this change, additional
lubrication is provided to the governor by an oil line
Assemble Control Housing
connected between the oil gallery in the cylinder block
and the governor weight housing. When replacing the
1. Install a 1/8 " pipe plug in the tapped hole in the
riser assembly, shaft and carrier assembly, or the
side of the control housing.
complete governor assembly, the new oil line must be
installed to provide adequate lubrication.
2. If necessary, assemble the control housing to the
weight housing, using a good quality sealant between
Examine the riser thrust bearing for excessive wear.
the tube and the housings.
flat spots or corrosion. If any of these conditions exist.
install a new riser and bearing assembly. Examine the
3. Install the governor operating shaft lower bearing,
weight carrier pins for wear and replace them if
numbered side out, in the weight housing. Install the
snap ring to secure the bearing (Fig. 5).
Inspect the spring seats, plungers. adjusting screws.
4. Apply a quality sealant around the edge of a new
lock nuts and other parts of the control housing for
plug and tap it in place.
defects that might affect governor operation.
Inspect the weight carrier, weights and retaining pins
5. Start the governor operating shaft upper bearing
for wear. The current single-weight carrier replaces the
over the upper end of the operating shaft. Support the
former double-weight carrier.
lower end of the shaft on the bed of an arbor press.
Use a sleeve and press down on the inner race of the
bearing until to contacts the shoulder of the operating
Inspect the fuel pump drive end of the weight shaft.
Replace the shaft if the end is worn or rounded.
6. Place the operating lever on the shaft with the flat
Inspect the bushing in the weight housing. Replace the
surface on the shaft registering with the flat surface on
bushing if it is worn excessively.
the lever. Press the lever tight against the bearing on
Inspect the spring seats, plungers, adjusting screws,