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What are signs of a bad piston?

* Engine knocking. This is a loud, metallic sound that occurs when the piston strikes the cylinder head or the cylinder walls. It is caused by excessive clearance between the piston and the cylinder, which allows the piston to move around too much and hit the other parts of the engine.

* Loss of power. A bad piston can cause the engine to lose power because it is not able to compress the air and fuel mixture properly. This can lead to a decrease in fuel efficiency and performance.

* Increased oil consumption. A bad piston can cause the engine to use more oil than normal because the oil can leak past the piston rings and into the combustion chamber.

* Blue or white smoke from the exhaust pipe. This is a sign that oil is leaking past the piston rings and into the combustion chamber, which is burning it and producing smoke.

* Engine overheating. A bad piston can cause the engine to overheat because it is not able to properly dissipate heat. This can lead to damage to the engine head and other components.

If you are experiencing any of these symptoms, it is important to have your engine checked by a qualified mechanic as soon as possible. A bad piston can cause serious damage to your engine, so it is important to get it fixed right away.