APRILIA V990 Manual page 45

V990 engine
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Follow
NOTE
At the TDC (ignition), the reference marks "IN"
(10) and "EX" (11) of the two gears prove parallel to the
head uncoupling surface, and face each other.
NOTE
Have the appropriate special tool m to hand:
– aprilia part# 0240880 (threaded bolt to lock the drive
shaft at the TDC) (12).
N
Screw the special tool (12) into the slot previously oc-
cupied by the M8 T.C.E.I. screw (8) by hand so that you
can feel it fit perfectly inside the driving shaft fastening
slot.
NOTE
Turn the driving shaft both ways to make sure
that the threaded bolt is engaged perfectly.
The bolt should not be overtightened.
Threaded pin driving torque: max. 5 Nm (0.5 kgm).
N
Unscrew and remove the closing screw (13) complete
with seal (14) and remove the complete chain tightener
(15).
N
Unscrew and remove the two M6 spacer screws (16)
and remove the chain guide bracket (17).
N
Pull the chain guide shoe (18) out from above.
NOTE
In order to be able to reassemble the two gear
wheels (19) correctly, proceed as follows: before remov-
ing them, use a felt tip pen to mark the left and right gear
wheels with LH and RH, respectively, and the gear
wheels and the camshafts with a reference mark (A).
N
Release the two gear wheels (19) from the timing chain
(20), then withdraw and remove them.
N
Unscrew and remove the six T.C.E.I. M6 x11.5 screws
(21).
N
Let the timing chain (20) drop into the cylinders chain
compartment.
N
Unscrew and remove the two M6 T.C.E.I. screws (22).
N
Unscrew and remove the four M10 nuts (23).
Release 00/2001-06
11
17
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Follow
18
22
23
23
DISASSEMBLING THE ENGINE
10
15
14
16
20
A
21
19
3
13
13
21
19
22
23
23
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