APRILIA 854239, Service Station Manual

Page: 124 / 216

NOTE
CHECK THAT THE CAMSHAFT IS FREE, NOT RESTING ON THE BUCKET TAPPETS.
•
Tighten the fixing screw of the front cyl-
inder timing shaft gear.
•
Release the front camshaft and the
crankshaft from the locking pins.
•
Working on the primary gear nut, turn the crankshaft clockwise by 283° so as to bring the
rear cylinder piston to the TDC in combustion phase.
•
Insert the pin in the crankshaft lock (timing pin) in order to block crankshaft rotation.
NOTE
THE SPECIAL TOOL IS ONLY USED FOR IDENTIFYING THE CORRECT CRANKSHAFT POSI-
TION.
DO NOT USE IT FOR TIGHTENING OPERATIONS.
•
Make the timing shaft turn so that the
timing shaft hole matches the head
holes.
•
Position the pin so as to lock the rear
cylinder timing cam.
•
Tighten the fixing screw of the rear cyl-
inder timing shaft gear.
NOTE
CHECK THAT THE CAMSHAFT IS FREE, NOT RESTING ON
THE BUCKET TAPPETS.
•
Release the rear camshaft and the
crankshaft from the locking pins.
•
Undo and remove the timing slot
screw.
•
Tighten the screw in the timing hole.
Cylinder-piston assembly
Engine
MXV 450
ENG - 124