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6-9
PART
6·2
3 SPEED PARTIALLY SYNCHRONISED MANUAL
SHIFT TRANSMISSION SERIES BW 199333
Section
Page
Section
Page
1 Description and Operation
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6-9
4 Major Repair Operations
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6-11
2 In-Car Adjustments
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6-10
Disassembly
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6-11
Gear Shift Linkage Adjustment
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6-10
Assembly
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6-.13
3 Removal and Installation
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6-11
D
DESCRIPTION AND OPERATION
DESCRIPTION
The 3·00 C.D. three-speed trans-
mission
is
used
in
models fitted with
a 6
cylinder
engine. The designation
3 · 00 C.D. is the actual distance
between the centreline of the coun-
tershaft and the
centreline
of the
input shaft.
An
identification plate
(Fig.
5) is attached to the
L/
Hand
rear of the extension housing.
A synchronizer is provided for
shifting to second and third speeds.
Shifts to first and reverse speeds are
accomplished with a sliding gear.
Ball bearings
support
the
input shaft
and gear and the centre of the output
shaft. Needle bearings in the input
shaft bore
support
the front of the
output shaft. The countershaft gear
(cluster gear) runs on 3 rows of
needle bearings. A bronze bushing
is
used in the reverse idler gear.
A bushing located at
the
rear of
the extension housing supports the
rear of the output shaft when the
tailshaft is
in
position. The synchro-
nizer and the blocking rings are the
conventional tapered ring and straight
clutch gear type.
OPERATION
When first gear is selected, the
shift lever moves the first and reverse
sliding
gear into mesh with the low
gear on the countershaft (cluster)
PART NQ ......__ _ _ _ _ _ _ _ _ _
MODELl
I
REF. NQ
I..____~
-$-
SERIAL NQ
_ I - - - -
~~LwARNER
BORG- WARNER
-~r~
1
(AUSTRAUA ) LIMITED
FIG. 5 -Identification Plate
gear
(Fig.
6). Power flow is now from
the input gear, through the counter-
shaft gear to the first and reverse
sliding gear and out through the
output shaft.
When second gear
is
selected, the
shift lever moves the second and
third speed synchronizer sleeve rear-
ward to force the blocking ring
conical surface against the matching
cone on the constant mesh inter-
mediate gear located on the output
shaft. When the vehicle is moving,
as when shifting from low to a
higher gear ratio, the internal teeth
of the synchronizer sleeve and those
on the blocking ring will not index
until the intermediate gear is brought
up or down to the speed of the
synchronizer sleeve which is rotating
at output shaft speed.
The synchronizer sleeve with fur-
ther movement will slide over the
blocking ring and engage the clutch
teeth on the constant mesh inter-
mediate gear. Since the intermediate
gear is now locked to the output
shaft by means of the synchronizer
sleeve, power flow is from the
input
shaft through the countershaft gear
to the constant mesh intermediate
gear to the output shaft.
Engagement of third speed
is
the
same as second except for
ratio.
In
third gear, the clutch teeth on the
input shaft are locked directly to
the output shaft by the second and
third speed synchronizer to provide
a ratio of 1
:
1.
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