Fantic Motor TL 250, Руководство по ремонту

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CHAPTER 18
ENGINE
WORKSHOP MANUAL
TL 250
18.4.5 Inspect the valve and valve spring
Check that the valve is not bent or burned, and that the stem is not
excessively worn, and measure the outside diameter of the stem.
Service limit value: Ø 4.94 mm
Seating surface width service limit: 1.5 mm .
In the event the valve's contact surface is very rough or
features excessive wear and corrosion, and there is poor
valve seating, it is hard to get the desired seal and you will
need to install a new valve.
Measure the valve spring's free length:
48.35 mm
Service limit value Spring: 47.5 mm
18.4.6 Inspect the rocker arm and rocker arm shaft
Check the rocker arm for wear or damage and inspect the
rocker arm roller's axial clearance. In the event of significant
wear or damage, or excessive rocker arm roller axial clearance,
you will need to install a new rocker arm.
Check the rocker arm shaft for wear.
If you find significant wear, you will need to install a new one.