APRILIA V990 Manual page 52

DISASSEMBLING THE ENGINE
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Carefully read 0.5.1 (PRECAUTIONS AND GENERAL
INFORMATIONS).
NOTE
The following operations can be performed with-
out removing the engine from the frame.
N
Unscrew and remove the M10 T.C.E.I. screw (1).
N
Remove the external counterweight (2), the drive pinion
(3), the internal counterweight (4) and the countershaft
key (5).
N
Unscrew and remove the two M8 T.E. screws (6) and
remove both spring washers (7).
N
Unscrew and remove the M6 T.C.E.I. screw (8) and re-
move the complete roller bearing flange (9).
NOTE
The cylinder and the head are still fitted on the
engine. In order to remove the timing chain (14), the
chain tightener and camshaft gears must be removed,
see 3.4 (DISASSEMBLING FRONT CYLINDER, HEAD
AND PISTON).
NOTE
During disassembly of the roller bearing flange
(9), there is no need to remove the components (10) (11)
(12) from the actual flange.
N
Pull out the spacer bush (10), the two locating dowels
(11) and two roller bearings (12).
NOTE
As of engine # 527354, the locating dowels (11)
are no longer fitted: centring is achieved with the aid of
the flange (9).
N
Remove the chain tightener shoe (13), pulling it out
from above.
NOTE
Mark the timing chain (14) with a coloured dot
so that you are sure to refit it with the same direction of
rotation.
Pull the timing chain (14) out from below, complete with
the idler gear (15), and remove the washer (16).
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- 00
V990 engine
Release 00/2001-06