MCi Crusader II 1989 Maintenance Manual page 20

Date
1-1-89
Page
1-14
MC-9 MAINTENANCE MANUAL
MEASURING KNUCKLE END PLAY WITH AXLE, WHEELS
AND TIRES INSTALLED
1.
Securely block vehicle to prevent rolling.
2. Place a jack under the axle beam as close as possible to .
the knuckle end being checked and jack the vehicle up until the
tire is clear of the floor.
3. Attach a dial indicator to the axle beam with a "C" clamp or
magnetic base (figure 1-28).
Figure 1-28. Dial Gauge Installed.
4. Place the dial indicator plunger on top of the king pm cao
or knuckle forging so that its line of action is approximately
parallel to the king pin center line.
5. Zero the dial indicator.
6. Measu_re the knuckle clearance (end play) by using a
suitable lever to lift the knuckle while observing the dial indica-
tor. Make a note of the measurement.
On axles in service. the end play may increase to a maxi-
mum of .065" (1.70 mm) at which time it will be necessary to
re-shim end play back to .001 " - 025" (.02-.64 mm).
NOTE: Both knuckles should be checked.
If a reading of over .065" is taken. remove th.e lire and king
pm cap and remeasure as per rebuild procedure. If the reading
is still over .065". then re-shim to specifications.
TIE ROD ENDS
The tie-rod assembly is of three-piece .construction com-
prised of a rod and two end assemblies.
See
figures
1-29
and
1-30. The tie-rod end automatically compensates for wear on
bearing surfaces. The tie-rod end stud is held in contact with the
bearing surface by tension of a spring which holds the seat firmly
against the inner end of the stud. An end plug, retained by a
locking ring, holds the internal tie-rod end parts in position.
Excessive play indicates that the bearing surfaces arewom, and
new
tie-rod end assemblies should
be
installed.
O:i some coaches non-repairable ends are used. These
assemblies must be replaced as a complete unit.
Socket wear is indicated by ball stud turning torque and
socket end movement. End move_ment may be checked with the
socket assembly attached to its mating arm. If a force sufficient
to overcome the sprmg pressure is applied to the end of the
forging. the amount of movement is an indicator of wear. New
socket assemblies should have an end movement of not more
than .020 inches (.508 mm). Maximum allowable end movement
on worn sockets is .090 inches {2.28 mm).
To check the turning torque value between the tie rod end
assembly stud and the ball cavity. the socket must be removed
from the vehicle. Minimum allowable torque value 1s 5 in. lbs.
(.565 Nm).
Figure 1-29. Tie Rod End (Later MC-9 Coaches).