* Severe Piston Damage: Without oil, the piston rings and cylinder walls seize up, leading to excessive friction and heat. This can cause the piston in cylinder 2 to either warp or crack, potentially causing it to hit the spark plug, breaking or damaging it. The damage might not be immediately visible but could cause repeated failure of that specific plug.
* Connecting Rod Damage: Similar to piston damage, a connecting rod in cylinder 2 could bend or break due to excessive friction. This could then impact the spark plug indirectly through piston movement or even direct contact.
* Valve Damage: Lack of lubrication can also lead to bent or damaged valves. While less directly related, a damaged valve in cylinder 2 could influence combustion pressure in unusual ways, potentially stressing the spark plug beyond its tolerance and leading to recurring failure.
* Increased Combustion Temperature: The seizing and friction create excessive heat throughout the engine. This heightened temperature in cylinder 2 could overheat and damage the spark plug itself, causing it to fail prematurely.
* Exhaust Valve Problems: A sticking exhaust valve in cylinder 2 could cause excessive back pressure. The higher pressure would put additional stress on components, leading to the failure of the spark plug.
* Pre-ignition/Detonation: The engine's running without oil likely resulted in extremely lean conditions (lack of proper fuel/air mixture due to damage to the piston, rings, and cylinder walls). This can lead to pre-ignition or detonation, which generates intense heat and pressure, damaging the spark plug.
It's important to note that running an engine without oil is incredibly destructive. The damage likely extends far beyond just the spark plug and cylinder 2. A thorough inspection of the entire engine is necessary before attempting any repairs. It's very likely that the engine requires a rebuild or replacement, not just a simple spark plug change.
