MCi Crusader II 1989 Maintenance Manual page 508

Date
1-1-89.
Page __
1s_-3_8 _ _
MC-9 MAINTENANCE MANUAL
If it is necessary to remove the bearing from the rotor,
follow these steps:
1. Remove the retaining ring from the rotor bore (figure
16-50).
2. Using the proper-sized arbor, press the bearin~
from the rotor.
INSPECTION:
1. Check the bearing for evidence of lubricant leakage,
looseness or excessive free play from inner race to outer
race. Check also for "roughness" in movement when inner
and outer race are rotated in opposite directions. Replace
the bearing if worn or defective.
NOTE: Bearing replacement Is recom-
mended any time the compressor clutch
is serviced after 150,000 mlles (240,000
km), regardless of its apparent condition.
2. Inspect the faces of both the rotor and armature
assemblies. Surfaces should be clean and free of discolora-
tion from grease or excessive heat. Check for presence of
raised ribs on faces of rotor and armature. Replace both
rotor and armature if raised ribs have been flattened or if the
faces are contaminated or burned.
CAUTION: Both assemblies must be
replaced
as
a pair. Do not Intermix a used
component with a new one. Premature
clutch failure wlll result.
3. Inspect the coil for damaged electrical leads, bent or
cracked mounting plate, or cracked coil potting com-
pound. Electrical resistance between connector terminals
of the coil should be 5.15-5.69 ohms. Resistance from either
terminal to coil case (ground) should be infinite or open.
Replace the coil if defective.
INSTALLATION
1. Position coil on clutch mounting hub with electrical
leads at 4 o'clock position. Align the mounting holes.
2. Install the coil-mount capscrews and tighten to 25-30
ft.-lb. (34-41 Nm) torque.
CAUTION: Do not draw coll onto flange
with the capscrews. Distortion of the coll
and mlsallgnment will result.
3. If clutch bearing is not installed in rotor, do so using
arbor and press. Install retaining ring.
4. To ease installation of the rotor onto the clutch bearing
mounting hub (on compressor), preheat inner race of rotor
bearing. A 75-100 watt outdoor post lamp-style bulb,
placed in the bearing for 15-30 minutes, will heat the race.
CAUTION: Do not heat the bearing with
open flame. Bearing must not
be
heated
more than 175.°F (79°C).
5. When bearing is heated, slide rotor assembly onto
clutch bearing mounting hub. Use rotor installation tool
20-296 seated against the bearing inner race and tap lightly
until bearing bottoms against flange. See figure 16-57.
~ ...,,"-
Figure
16-57:
Installing Rotor/Bearing Assembly
6. Install bearing retaining nut, using tool 20-294 and a
torque wrench. See figure 16-58. Due to the self-locking
feature of the nut, observe the torque required to seat the
bearing against the hub. After the bearing seats, tighten the
nut 50 lb.-ft. (68 Nm) greater than the bearing-seating
torque.
Figure 1i-58: Tightening Bearing Retaining Nut
7. Check coil-to-rotor clearance with feeler gauge .020"
(.508 mm) thick by .156" (.842 mm) wide (max.). Insert the
feeler gauge through a slot in the rotor face .(figure 16-59)
so it extends beyond the rear of the rotor. Slowly rotate the
rotor one full revolution. The feeler should not rub or bind
against the coil shell. Make the test through several evenly
spaced slots around the rotor circumference.
NOTE: If the feeler gauge check shows
misallgnment between the rotor and fleld
shell, determine the cause. The fleld
mounting bracket must
be
flat and not
distorted.