What Happens When an Engine Seizes?
A seized or “locked up” engine is a serious mechanical failure that prevents the motor from turning over or starting. While the vehicle’s electrical components may still function, the engine itself remains immobile. This occurs when internal parts become fused together due to extreme heat, lack of lubrication, or other catastrophic damage.
Signs of a Seized Engine
There are several telltale symptoms that may indicate your engine has seized:
• The engine won’t crank or turn over when you try to start it
• You hear a loud clunking or knocking noise when attempting to start
• The starter motor engages but can’t rotate the engine
• There’s visible damage or holes in the engine block
• You see metal shavings in the oil
If you notice any of these warning signs, it’s crucial to have your vehicle inspected by a qualified mechanic immediately. Continuing to try starting a seized engine can cause further damage.
Can a Seized Engine Be Repaired?
In most cases, a fully seized engine requires complete replacement or a full rebuild. However, if caught early, some locked engines can potentially be salvaged:
• For engines seized from sitting unused, removing spark plugs and adding penetrating oil to the cylinders may free it up
• Hydrolock from water ingestion can sometimes be fixed by removing spark plugs and cranking the engine to expel the fluid
• Minor seizures from overheating may be resolved by allowing the engine to cool and adding fresh oil
The feasibility and cost of repairs depend on the extent of internal damage. A professional diagnosis is needed to determine the best course of action.
Preventing Engine Seizure
While not always avoidable, there are steps you can take to reduce the risk of engine seizure:
• Follow the recommended oil change intervals
• Check and maintain proper oil levels
• Address any unusual noises or performance issues promptly
• Avoid driving through deep water that could enter the engine
• Don’t continue driving an overheating vehicle
Regular maintenance and attentiveness to warning signs are key to preserving your engine’s longevity and avoiding catastrophic failure.