Derbi Dirtboy 10 Workshop Manual page 35

E E ENGINE
EN G I N E
- Replace any damaged parts.
C
HARACTERISTIC
Minimum allowable diameter «A»:
Ø 10,970mm
Minimum allowable diameter «B»:
Ø 11,030 mm
R R
EFITTING THE HEAD AND TIMING SYSTEM COMPONENTS EFITTING THE HEAD AND TIMING SYSTEM COMPONENTS
- Rest the cylinder head steadily on a worktable.
- Screw on the camshaft fitting tool to its abutting end on the
bearing inner race.
- Push the camshaft in its housing, fitted with the bearing, as
far as it goes. Remove the tool.
- After having carefully cleaned all the contact surfaces,
install a new head gasket with the same thickness as the old
one.
- Insert the cylinder holding-down studs into the cylinder
head and tighten the four locknuts with a torque indicate.
N.B.
REPLACE THE CAMSHAFT BEARING WITH A NEW ONE
WHENEVER IT IS REMOVED.
Specific tooling
020450y Camshaft fitting/removing tool
Locking torques (N*m)
Head-cylinder stud nut:
6-7 +135° +90° N-m for first fitting, 6 - 7 90° +90° N-m for
refitting/locking
- Loosen the rocker arm adjusters.
- Fit the pivot and the intake and exhaust rocker arms.
- Lubricate the two rocker arms through the holes.
35
- CYLINDER ASSY. AND TIMING SYSTEM
- CYLIND ER A S SY. A N D T IMIN G SYST E M