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41. Mill or ream the valve seats. The angle is the
same for the exhaust and inlet valve seats.
42. Check the flatness of the cylinderhead. Use a
steel straight edge.
43. Check that all the valves and the valve seats are
perfectly ground by marking the valve seat face
and turning it against the valve seat with light
pressure. If the marking is not evenly distributed
on the whole of the seat (leaking valve) the valve
is ground further and a new check is carried out
until the result is satisfactory.
44. Check the wear of the valve and the valve guides.
The play for the inlet valve is 0.030–0.060 mm
(0.0012–0.0024") and for the exhaust 0.060–
0.090 mm (0.0024–0.0035").
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