MOTO GUZZI V10 CENTAURO Werkstatt-Handbuch Seite 58

HEADS
Check that:
■ the surfaces in contact with the cover and with the cylinder are not scratched or damaged thus preventing a
perfect seal;
■ check that the tolerance between the valve guide holes and the valve stems are within the prescribed limits;
■ check the state of the valve seats.
INLET VALVE
45°30'±5'
VALVE GUIDE
To extract the valve guides from the heads, use a punch.
The valve guides should be replaced when the clearance between the above and the stems cannot be eliminated
by replacing the valves alone.
To fit the valve guides on the heads:
■ heat the head in an oven to approximately 60°C, then lubricate the valve guides;
■ fit the piston rings;
■ press the valve guides with a punch; pass a stem borer in the holes of the valve stems, to restore the prescribed
internal diameter (Fig. 10-51).
The allowance between the seat on the head and the valve guide must be 0.046÷0.075 mm.
DATA TABLE FOR VALVE AND GUIDE COUPLINGS
Inlet
Exhaust
VALVE SEATS
The valve seats should be milled. The seat inclination is 45°±5'.
After milling, to obtain a good coupling and a perfect seal between the ring nut and the valve mushrooms, use
a honing machine.
Detail of exhaust valve seat
56
Ø8.000÷8.022 mm
Ø7.987÷7.972
Ø46.3÷46.5
i
nternal valve guide
mm
8,000÷8,022
Ø41÷41.1
Ø43.9÷44.1
Ø46
Ø47.04
Ø7.980÷7.965
Ø39.3÷39.5
45°30'±5'
dia. valve stem dia.
mm
7,972÷7,987
7,965÷7,980
Ø36÷36.1
Ø36.4÷36.6
Ø39
Ø41.77
Detail intake valve seat
EXHAUST VALVE
10-51
fitting clearance
mm
0,013÷0,050
0,020÷0,057
10-52