[Jac Mac]

IF the eccentric is a single piece unit and turning or moving then you are on the edge of disaster as it also means that the single bolt retaining the cam gear/sprocket is not tight. The single dowel will not last long if this is the case- I remember breaking one while trying to degree a cam in with all the valve train in place once, with the bolt only finger tight-- dowel snapped off flush with front of cam. That was only winding the crank over by hand, dont think they would go for long in a running situation with the bolt loose!