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PART 6-4-4-SPEED FULLY SYNCHRONIZED MANUAL TRANSMISSION
6-25
to match the speed of the output
shaft. Further movement of the
sleeve locks the first- and second-
speed synchronizer hub to
·
the first-
speed gear by means of internal
splines. On engagement of
the·
clutch,
power flows through the input shaft
and gear to the meshed countershaft
gear and thence to the first-speed
gear. This gear transmits the power
through the locked synchronizer hub
to the transmission output shaft. All
the other forward-speed gears are in
idler motion, as they are all driven
by the countershaft (cluster) gear,
but they do not transmit power be-
cause they are not locked to the
output shaft. All the forward-speed
shifts are made in the same manner
as the first-speed shift, due to the
constant-mesh features.
Reverse gear is engaged by moving
the reverse sliding gear forward on
the reverse idler gear until it meshes
with the external teeth (spur-type) of
the first- and second-speed synchro-
nizer sleeve. Movement of the sliding
gear is accomplished by the centre
shaft lever. With all forward-speed
synchronizer sleeves in neutral, power
flow in reverse is through the input
shaft to the constant-mesh counter-
shaft (cluster) gear, thence to the
constant-mesh reverse idler. Splines
then carry the power through the
reverse sliding gear to the first- and
second-speed synchronizer sleeve
which is locked to the output shaft.
As the reverse sliding gear is meshed
with the synchronizer sleeve, power
is transmitted to the output shaft,
rotating it in a reverse direction.
NOTE:
All
HELICAl GEARS
IN CONSTANT MESH
WITH COUNTERSHAFT
GEAR
FIG. 49-Power Flow
SECOND SPEED
GEAR
FIRST AND SECOND
SPEED SYNCHRONIZER
REVERSE SLIDING GEAR
EJ
IN-CAR
ADJUSTMENTS AND REPAIRS
SHIFT LINKAGE ADJUSTMENT
1. Loosen the three shift linkage
and adjustment nuts. Install a
t"
diameter alignment tool through the
control bracket and levers as shown
in Fig. 50
An alignment tool can
be
made
from
t"
diameter drill rod bent to
an "L" shape. The extensions should
be 1
W'
and 3W' from the elbow. Long
end
of alignment pin should be in-
serted into control bracket and
linkage holes
until
it bottoms.
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REMOVAL
AND INSTALLATION
REMOVAL
1. Remove gear shift control lever
knob.
2. Remove the console and or
dust seal and retainer (Fig. 50).
3. Remove the three gear shift
control lever mounting bolts and
remove the lever.
4.
Raise
the vehicle on a hoist.
5.
Disconnect
the drive shaft from
the
rear U-joint flange. Slide the
drive
shaft off the transmission out-
put shaft and install the extension
housing
seal installation tool into the
extension
housing
to prevent lubri-
cant leakage.
6. Disconnect the speedomett.
2. Tighten the three linkage ad-
justment nuts and then remove the
alignment pin.
3. Check the gear shift lever for a
smooth cross-over.
cable from the extension housing.
7. Disconnect the parking brake
cable from the equalizer lever and
separate the lever from the cross-
member.
8. Remove the hairpin retainer
securing the cable to the transmission
rear support crossmember, and then
pull the cable assembly forward and
out of the crossmember.
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