How is the engine crankshaft positioned?

1. "If the crankshaft in the engine is not positioned axially, there will be axial movement, which will cause the crankshaft to withstand axial pressure, and also cause eccentric wear of the connecting rod bearings, pistons, and piston pins. When the clutch is stepped on, due to axial movement, the free travel of the clutch will be changed, and the vehicle will shudder when starting.". Therefore, the axial direction of the crankshaft must be positioned.

2. The axial positioning of the crankshaft is generally carried out using thrust plates, which are composed of four semicircular gaskets and installed on the last journal of the crankshaft. Both sides of the bearing shells are located at the rear of the engine cylinder block.

3. The biggest reason for the axial movement of the crankshaft is due to the inertia of the vehicle and the thrust of the clutch pressure plate compressed by the release bearing pushed forward by the shift fork when stepping on the clutch. Installing a thrust plate at the rear of the cylinder block is the best position, because the heaviest parts of the crankshaft driving the rotation are the flying wheel and the clutch. If the thrust plate is installed at the front or middle of the crankshaft, it will cause the crankshaft to withstand an unstable axial pressure for a long time, "The crankshaft can change the operating conditions of the engine due to deformation, and in severe cases, it can also break.". Only when a thrust plate is installed at the rear of the cylinder block on the crankshaft for positioning, can the crankshaft be free of axial pressure.