Cylinder head assemblies: valves - rocker arms
file:///D|/Manuales/Para%20recolocar/MOTOS/DUCATI/DUCATI/M796/wsm/EN/M796_ABS_11_9_4D.70.1.html[11/12/2015 18:40:46]
Heat the cylinder head gradually and evenly up to 200 °C and chill the new valve seats in dry ice.
Install the seats perfectly square into their bores using a suitable installer.
Allow to cool and then lap the valve seats, smooth the connections between the ducts and the new seats and grind the
valves.
Valve–seat contact surfaces
Use Prussian blue or a mixture of minimum and oil to check that the contact surface (W) between valve and seat is 1.0 to
1.5 mm.
Maximum permissible limit: 2.0 mm.
Grind the seat if the dimension measured is greater than above limit.
Fill the intake and exhaust ducts with fuel to check for leaks; if leaking occurs, check the sealing surfaces for burrs.
Overhaul of the valve guides
Carefully examine the internal surface of the valve guide: for cracking or distortion. If the guide is excessively out-of-
round, use a reaming tool to make the mating faces more uniform.
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