1. Fuel Accumulation: A leaking or dribbling injector allows excess fuel to accumulate in the combustion chamber or on the piston crown. Over time, this accumulated fuel can lead to the formation of carbon deposits. These deposits can act as hot spots and cause localized overheating.
2. Washdown Effect: The continuous dribble of fuel from a leaky injector can wash away the lubricating oil film present on the cylinder walls and piston rings. Without proper lubrication, the piston rings can no longer effectively seal the combustion chamber, resulting in increased blow-by gases. These high-temperature gases can further contribute to piston overheating.
3. Detonation: Dribbling injectors can also lead to engine knocking or detonation. This occurs when the accumulated fuel ignites too early in the combustion cycle, creating excessive pressure and heat. Detonation can cause severe damage to the piston, including cracks, scuffing, or even complete seizure.
4. Increased Friction: The presence of excess fuel and carbon deposits in the combustion chamber can increase friction between the piston and the cylinder walls. This added friction further elevates the temperature of the piston.
5. Loss of Cooling: The continuous flow of fuel from a dribbling injector can interfere with the proper cooling of the piston. Excess fuel can act as a barrier, preventing the efficient transfer of heat away from the piston. This can exacerbate the overheating and lead to piston seizure.
It's important to note that piston seizure due to injector dribbling typically occurs over an extended period of time. Regular inspections and maintenance of fuel injectors are crucial to prevent this issue and ensure the longevity of the engine.
