Lotus TURBO ESPRIT Service Manual page 275

Page
22
This
distance i s different for each bevel pinion and is checked using the distance
gauge fixture TOOOT0616 fitted with dial gauge TOOOT0615. The fixture i s designed so that
the distance between the centre line of the ground contact faces (drive shaft bearing
surfaces) and the faces of the probes i s 60 mm.
This
figure i s engraved on the fixture
between the probes.
First
calibrate the fixture.
(a).
Clean the bearing surfaces and the ground contact faces of the
fixing.
(b).
Place the fixture on a surface plate.
(c).
Zero the dial gauge with the large needle on 0.
(d).
Note the position of the totalising needle.
Totalising needle between 4and 5.
Large needle a t 0.
Offer the fixture up to the bearing surfaces of the drive shafts with the dial
gauge stem not i n contact with the ground face of the bevel pinion, uhlock
the gauge stem.
Rotate the fixture i n the bearing sr~rfaces, so the gauge stem passes over the
ground face of the pinion, until the large needle ofthe dial gauge i s about
to change direction. Lock the needle positions and note the readings.
Example: Total king needle between 0 and
1
.
Large needle at
86.
Remove the fixture and place once again on the surface plate. Allow the
dial gauge stem to return slowly, so the full revolutions can be counted.
When the gauge stem comes torest on the surface plate the measurement of
the part revolution can be made.
If
the measurements for the examples are:
Conic distance 60
+
3.86
=
63.86 mm.
If
the dimension engraved on the pinion for
this
example i s 63.95 m m then
the bevel pinion must be moved away from the differential centre line by:
63.95
-
63.86
=
0.09
mm.
To adjust the bevel pinion remove the rear housing, the speedometer drive
wheel and the 5th gear pinion.
Remove the bevel pinion as previously described.