APRILIA TUONO R FACTORY 2007 Service Station Manual page 178

Engine
Unscrew and take out the screw (2), the seal
washer (3) and the nozzle (4).
Check that the conducts are clean at every lubri-
cating hole on both crankcase halves and if re-
quired, clean them by blowing in a jet of com-
pressed air.
BALL BEARING FITTING
Check the interference between the bearing and
the hole on the engine crankcase halves.
Interference (X) = (Diam. A) minus (Diam. A1) :
0.01 mm (0.0004 in)
CRANKSHAFT MAIN BUSHINGS AND COUNTERSHAFT MAIN BUSHINGS
MAIN BUSHINGS MUST BE REPLACED ONLY AT AUTHORISED WORKSHOPS, USING SPECIFIC
MEASURING DEVICES AND EQUIPMENT.
Measure the inside diameter of the crankshaft main bushings of both crankcase halves.
Crankshaft main bushings: wear limits Diam. 46.035 mm (1.81240 in).
Measure the inside diameter of the countershaft main bushings of both crankcase halves.
Countershaft main bushings: wear limit Diam. 32.060 mm (1.26220 in).
CARRY OUT SEVERAL MEASUREMENTS, SPECIALLY IN THE DIRECTION OF THE AXIS OF
BOTH CYLINDER, AVOIDING THE COUPLING SURFACE OF THE 2 HALF-SHELLS.
VALUES MUST NEVER EXCEED THE LIMITS SPECIFIED.
MEASURE THE RADIAL CLEARANCE BETWEEN THE MAIN BUSHINGS AND THE RELATED
CRANKSHAFT AREAS.
CHECK THE RADIAL CLEARANCE BETWEEN THE MAIN BUSHINGS AND THE RELATED COUN-
TERSHAFT AREAS.
Check there are no signs of wear or sliding marks on the axial thrust surfaces on the crankshaft, on
both crankcase halves..
Check there are no signs of wear or sliding marks on the axial thrust surfaces on the countershaft, on
both crankcase halves, clutch side.
CHECK CRANKCASE AXIAL CLEARANCE.
CHECK COUNTERSHAFT AXIAL CLEARANCE.
ENG - 178
TUONO R_FACTORY