Will the vehicle misfire if the crankshaft bearing clearance is too large?

[RachelRose]

It is possible. The following are the effects of excessive crankshaft bearing clearance on engine performance: 1. Abnormal noise: Excessive clearance in the main bearings, caused by wear, can produce a "clanging" sound, accelerating wear on other main bearings and potentially damaging the crankshaft in severe cases; similarly, excessive clearance in the connecting rod bearings can also produce a "clanging" sound, accelerating wear on the piston pin and journal, reducing compression ratio, and causing excessive ignition advance angle, potentially damaging the cylinder liner in severe cases; 2. Bent or broken connecting rod: This can lead to decreased oil pressure, affecting lubrication in the upper parts of the cylinder head. The impact between the bearing and the shaft can, over time, produce a knocking sound, also known as bearing noise, which increases with engine speed. Severe wear of the bearings can cause the connecting rod to collide with the cylinder liner, resulting in a bent or broken connecting rod.