Obvious Signs:
* Inability to turn the engine over: This is the most definitive sign. When you try to crank the engine (with the key or starter), it won't budge. You might feel significant resistance, or it might not even turn at all. This is different from a dead battery, which will have minimal or no resistance when cranking.
* Unusual sounds during previous operation: Before complete seizure, you may have noticed increasingly loud knocking, grinding, or squealing noises coming from the engine. This indicates internal damage that is likely leading to a seizure.
Less Obvious Signs (requiring more investigation):
* Overheating: If the engine has significantly overheated, it increases the risk of seizure due to thermal expansion and damage.
* Low oil pressure: Lack of lubrication is a major cause of engine seizure. Check your oil pressure gauge (if equipped) or have it checked with a pressure gauge. Low oil pressure or a lack of oil is a serious warning sign.
* Visible damage (oil leaks, etc.): While not directly indicating seizure, significant oil leaks can be a symptom of internal damage that might lead to a seizure. A visible crack in the engine block is also a very bad sign.
* Smell of burning oil: This can indicate excessive friction within the engine.
How to check:
1. Attempt to turn the engine over: This is the first and most important test. Use a wrench on the crankshaft bolt (if accessible) to check manually if the engine turns freely. Caution: Be prepared for significant resistance if the engine is seized. Do not force it.
2. Check the oil: Inspect the oil level and condition. Is it low? Is it milky (indicating water contamination)? Is it black and gritty (indicating excessive wear)?
3. Look for external damage: Visually inspect the engine for any obvious damage, leaks, or signs of overheating.
4. Listen for unusual sounds: If the engine hasn't completely seized, listen for any unusual sounds while cranking.
Important Note: If you suspect your engine is seized, do not attempt to force it. Further damage can be incurred, making repairs even more costly. It's best to have a qualified mechanic diagnose and repair the problem.
