Refitting The Timing System Components - Derbi GP1 125-250 c.c. Workshop Manual

Camshaft check: Standard height
Exhaust: 29,209 mm
Camshaft check: Standard height
Intake: 30,285 mm
Camshaft check: Minimum admissible diameter
Connection B Ø: 19,950mm
Camshaft check: Minimum admissible diameter
Connection A Ø: 36,94 mm
Camshaft check: Standard diameter
Connection B Ø: 19,959÷19,98 mm
Camshaft check: Standard diameter
Connection A Ø: 36,95÷36,975 mm
R R
IFFITING THE TIMING SYSTEM COMPONENTS IFFITING THE TIMING SYSTEM COMPONENTS
Version 125
- Insert the timing chain guide sliding block.
- Insert the centring dowels between head and cylinder, ins-
tall the head gasket and the head on the cylinder.
- Lubricate the stud bolt threading
- Tighten the nuts at a preliminary torque of 7±1 N-m
- Turn by an angle of 180° (2 turns by 90° each) To perform
the above operations, follow the tightening sequence shown
in the figure.
- Install the two screws on the timing chain side and tighten
at the prescribed torque.
N.B.
BEFORE INSTALLING THE HEAD, MAKE SURETHAT THE LU-
BRICATION CHANNEL IS CLEAN USING A COMPRESSED AIR
JET.
Locking torques (N*m)
Timing belt tightener support screw 11 ÷ 13
122