MANUAL GEARBOX
Repairing the gearbox
21
21-21
JR
SETTING THE PRE-TENSIONING OF THE
SECONDARY SHAFT BEARINGS
NOTE
: this operation is only carried out when
replacing the bearings.
Clutch housing without differential and without primary
shaft.
Fit the secondary shaft in the clutch housing with the
bearings and the pre-setting washer
B. Vi. 1161
, or
equivalent, of
1.60 mm
(large outer
∅
).
Fit the mechanism housing.
Fit and tighten to torque the box belt bolts.
Fit the dial gauge support plate
B. Vi. 1161
, or
equivalent, on the tripod basin mountings.
Fit:
●
the
B. Vi. 1527
special spacer (A),
●
the bolt (C),
●
the dial gauge with its magnetic holder.
A
A Rotate the secondary shaft several times to fit the
bearings.
B
B Set the dial gauge to zero.
C
C Pull the secondary shaft upwards by making a
lever out of two screwdrivers.
D
D Take a reading from the dial gauge.
Repeat the actions (
A
to
D
) several times.
Calculate the average of the readings.
Calculation of the value of the pre-tensioning
timing washer.
Prescribed value + value of the pre-setting
average of the readings on the dial gauge = value of
the pre-tensioning dial gauge washer.
Example
: (Values in mm).
NOTE
: a set of timing washers of
2.15 mm
to
2.43 mm
from
0.04 mm
to
0.04 mm
thickness is supplied as
replacement parts.
0.26
+
0.49
+
1.60
=
2.35
Pre-
scribed
value
Average
reading
Pre-setting
washer
value
Pre-
tensioning
timing
washer value