What effect does camshaft clearance have on the engine?

What effect does camshaft clearance have on the engine? Pump camshaft manufacturers for you to introduce it:

The rear end of the camshaft of the in-line fuel injection pump is usually directly fixed with the speed sensing elements such as the governor's fly hammer or fly ball. When the axial clearance of the camshaft increases, the camshaft will move back and forth in the work, which will drive the fly hammer and other induction mechanisms to move back and forth and directly affect the stability of the governor. For example, RADRFDRSV801 governor, when the camshaft position changes, it will make the governor fly hammer mechanism move forward, then make the high and low speed travel distribution ratio change, destroy the normal state of the governor. Equivalent to the L value change. Other types of governor also have their own impact. In addition, the increase of camshaft axial clearance is bound to result in the increase of bearing radial clearance. It will not only make the oil supply time unstable due to the runout of camshaft, but also increase the vibration noise during the work and accelerate the wear of transmission parts and bearings. So in the maintenance must pay attention to the camshaft clearance inspection and adjustment. In general, the axial clearance of camshaft shall be 0.02-0.05mm. The empirical method is that after the bearing cover is tightened, the camshaft can be rotated by hand, but it is advisable to feel laborious.