APRILIA 8140172, Service And Repair Manual

Page: 135 / 279

ENGINE
RSV mille
3 - 52
3.6.14 COUNTERSHAFT AND COUNTERSHAFT
MECHANISM
Carefully read 0.2.1 (PRECAUTIONS AND GENERAL
INFORMATIONS).
Check the wear of the countershaft:
– housing of bush (1);
wear limit min. Ø 31.980 mm;
– housing of thrust support bush (2);
wear limit min. Ø 19.990 mm;
– housing of bush (1);
permissible radial play min. Ø 0.060 mm;
– housing of support bush (2);
permissible radial play min. Ø 0.060 mm.
NOTE
The radial play of the countershaft is determined
based on the following values:
maximum value of the main bush diameter in the engine
casing or in the clutch cover minus the value of the bear-
ing housing (1) or the support bush housing (2) of the
countershaft.
Measure the main bush diameter, see 3.6.5 (ENGINE
HALF-CASING - MAIN BUSHES, DRIVING SHAFT AND
C O U N T E R S H A F T) an d 3 . 5 . 8 (RE MO V I N G T H E
CLUTCH COVER).
NOTE
If the max. permissible radial play is exceeded,
the worn part must be replaced.
Permissible radial play of the countershaft max.
0.30 mm.
NOTE
Once the two halves of the engine casing have
been coupled, check the end play of the countershaft with
a comparator.
The following components must also be checked for wear
or broken material:
– axial thrust-bearing surfaces (3);
– key (4) and grooves in the countershaft;
– colouring of a bush housing.
◆
Clean the thread of any LOCTITE
®
residues and make
sure it is in a perfect state of repair.
◆ Check the sides of the teeth of the driving gear (5) and
driven gear (6) for any signs of broken material or dis-
tortion.
NOTE
In order to check the main bushes, see 3.6.5
(ENGINE HALF-CASING - MAIN BUSHES, DRIVING
SHAFT AND COUNTERSHAFT) and 3.5.8 (REMOVING
THE CLUTCH COVER).