- Install a new tightener on the cylinder using a new
gasket.
- Tighten the two fastening screws to the prescri-
bed torque.
Locking torques (N*m)
Tightener fastening screws: 11 ÷ 13
- Insert the spring with the central screw and the
washer.
- Tighten the central screw to the prescribed tor-
que.
Locking torques (N*m)
Tightener screw: 5 - 6
- Place the engine with the valve clearance adjustment timing references aligned with the head.
- Check the clearance between valve and rocking lever using a thickness gauge.
PRESCRIBED CLEARANCE
Specification Desc./Quantity
Inlet 0.15 mm (engine cold)
drainage 0.15 mm (engine cold)
- In case different values are found, adjust by loos-
ening the lock nut and use a screwdriver for the set
screw as shown in the figure.
Refitting the timing chain
The ignition advance is determined electronically on the basis of parameters known by the control unit.
For this reason it is not possible to declare the reference values based on the engine rpm.
The ignition timing value is detectable any time using the diagnostic tester.
It is possible to check whether the ignition advance determined by the system does in fact correspond
with the value actually activated on the engine, by means of the stroboscopic light.
Specific tooling
MP3 400 i.e. Engine
ENG - 75
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