What happens if the crankshaft breaks?

The crankshaft is a core component of the engine. Damage can directly affect normal engine operation and, in severe cases, even render the engine useless. The following are common symptoms and consequences of crankshaft damage:

1. Severe engine shaking or stalling
A deformed or broken crankshaft can cause unbalanced piston movement, leading to unstable engine operation, noticeable shaking, or even sudden stalling and an inability to restart.

2. Abnormal noise (knocking)
If the crankshaft journal or bearings are worn, intense friction between the metal parts will occur, producing a "clicking" or "clanging" sound, especially noticeable during acceleration.

3. Drop in oil pressure
A worn crankshaft can increase bearing clearance, leading to oil leakage and illumination of the oil pressure warning light. Inadequate lubrication can further exacerbate internal engine wear.

4. Reduced power and increased fuel consumption
A deformed or unbalanced crankshaft can affect engine efficiency, resulting in reduced power and weak acceleration. Incomplete combustion can also lead to increased fuel consumption.

5. In severe cases, the engine may be scrapped.
A crankshaft fracture can damage the piston, connecting rod, or even the cylinder block, resulting in extremely high repair costs, sometimes necessitating complete engine replacement.

Recommendation: Immediately inspect any unusual engine noises, vibrations, or abnormal oil pressure to prevent minor issues from becoming major failures. Regular maintenance and the use of qualified engine oil can effectively extend the life of the crankshaft.