MCi Crusader II 1989 Maintenance Manual page 300

Date
1-1-SS
Page_. __
8 _- 4 _ _
MC-9 MAINTENANCE MANUAL
These rubber mounts should be replaced whenever the
~
engine is removed from the coach (e.g. clutch change. etc.).
The following procedure is recommended for replacement
of motor mounts:
1. Remove the existing rubber mounts from brackets.
2. Lubricate new rubber mounts with water and place in
position between bracket and engine cradle. By use of a small
jack under the cradle, the mounts may be installed in engine
bracket
CAUTION: To properly insert the engine
mounts, only water should be used as a
lubricant. Insertion of the mounts into the
socket using glycerine or any other lubri-
cant will result in the tail of the mounts
flaring out with the rubber rupturing or a
potential rupture after each in~t~llation.
3. Install engine mount bolts with new retaining washer but
do not tighten until the full weight of engine is bearing on cradle
assembly.
Improper installation of the press fit type motor mounts can
contribute to excessive engine vibration. When new mounts are
installed, mount bolts should be left loose until engine can be
run for a short period of time. If engine is accelerated a few
times. the rubber mount will find its correct position·and then
mount bolts can be torqued and cotter keys installed.
4. When reinstalling the engine cradle assembly, the body
de bar should be installed before attempting to tighten cradle
U-bolts. the center U-bolts should be tightened first
If motor-mount studs are being installed in the transmission
case, turn the studs in until they "shoulder out" Check to
ensure each stud has reached full thread engagement and
snug up no more than¼ turn. Motor-mount bracket and hard-
ware can then be installed. Tighten lock nuts to 170-198 ft. lbs.
(231-268 Nm) torque.
TWO SPEED GOVERNOR ADJUSTMENT
(Mechanically Controlled Engines)
The service procedure below provides the necessary inspec-
tion instructions for obtaining the maximum operating effi-
ciency of the two speed governor (figure 8-5). This procedure
should be accomplished every 30 months or every 50,000 miles
(80.000 km), as part of regular coach maintenance.
The engine speeds specified in this procedure are recom-
mended as follows: High maximum no-load speed 2250 rpm;
low maximum no-load speed 1850 rpm. The 2250 rpm is
achieved by a shim pack inside the two speed governor. Adding
shims increases the high maximum no-load arid taking shims
out decreases the speed. The low maximum no-load eng_ine
speed is achieved by an adjusting screw (see figure 8-6).
NOTE: The 2250 rpm is required for coaches
equipped with the later version automatic ·
transmission (HT-740), unless the trans-
mission shift points have been adjusted
downward. The 1850 rpm will give a coach
top speed of approximately 67 mph when
equipped with a 3.33:1 rear axle.
Figure 8-5. Location of Governor.
Figure 8-6.
1. The engine injector control levers should be set in accor-
dance with ODA Service Manual 6SE350, Section 14.3. Make
sure the fast idle cylinder projects
5/s"
(15.88 mm) from the lock
nut to prevent interference while adjusting the maximum no-
load speeds.
2. Start the engine and allow it to reach normal operating
temperature.
3. Refer to figure 8-6. Disconnect the air line to the two
speed governor spring housing.
4. Set the speed control lever (figure 8-7) in the maixmum
speed position. Using a tachometer. check and record the
engine rpm. This is the maximum no-load low engine speed
(approximately 1850 rpm) which will be restored at the end of
this procedure.
Figure 8-7. Control Lever and Fast Idle Cylinder.