What is the reason for the abnormal noise in the flywheel of the Mistra 1.6?

[VonDawson]

Mistra 1.6 flywheel abnormal noise reasons are as follows: Excessive clearance: It may be due to excessive clearance between the piston and cylinder wall. The connection between the noise and engine speed: Most commonly encountered noises in the engine depend on the engine's speed state, and the noise only occurs at idle or low-speed rotation. Piston installed too tightly: The piston pin is installed too tightly or the connecting rod bearing is installed too tightly; The contour of the camshaft is worn; Sometimes, the starter clutch is loose, causing the pulley to make noise (especially noticeable when the speed changes). The noise becomes chaotic when maintaining a certain speed, and short noises are successively emitted during rapid deceleration.