APRILIA TUONO R FACTORY 2007 Service Station Manual page 145

TUONO R_FACTORY
Checking the overhead camshaft
Check the camshaft for damaged, distorted or
worn material; replace the camshaft if required.
Measure the camshaft clearance:
•
Set the camshafts in the head.
•
Apply a plastic gauge (1) on the cam-
shaft bearing seats.
•
Fit the U-bolts according to the corre-
sponding marking and fix them with
TCEI M6. screws.
•
Remove the TCEI screws and the U-
bolts.
•
With the specific graduated scale (2),
the maximum width of the pressed
plastic gauge.
Max. wear limit 0.060 mm (0.00236 in).
If the wear limit is exceeded, measure the bushing
seats on the camshaft and on the head and re-
place the worn component.
Camshafts bushing seats:
wear limit (3) min. diam. 23.950 mm (0.9429 in).
Bushing seats on the head:
wear limit max. diam. 24.040 mm (0.9464 in).
Insert the intake and outlet camshafts in their seats
on the head and measure the axial clearance with
a comparator.
Camshaft axial clearance:
wear limits: max. 0.40 mm (0.0157 in)
If the wear limit is exceeded, measure the axial
faying surfaces of the camshaft and on the head
and replace the worn component.
Axial faying surfaces, (4) camshaft:
wear limits: max. 27.77 mm (1.093 in)
Axial faying surfaces, head:
wear limits: min. 27.10 mm (1.067 in)
If a camshaft is replaced, the bowls must also be
replaced.
Engine
ENG - 145