Ever heard a clunking sound while driving? Don't panic, but don't ignore it either. This kind of noise could be a sign that something is wrong in the engine compartment. If left unchecked, it could cause a domino effect that damages other components, and ultimately, your wallet.

Interestingly, not all clunking noises mean that the engine is severely damaged. Sometimes it's just a small sign that something needs to be checked. So before it gets worse, let's first identify the causes and how to fix them.

What is that clunking noise?

Clunking noises usually sound like rhythmic metal knocks, occurring when the engine is started or running. This sound often comes from the engine compartment and can be caused by many things, ranging from worn components, oil not rising, to incompatible fuel.

The point is, if you hear a strange noise, don't jump to conclusions; it's better to find out the source first.

Causes of a Clunking Sound in a Car Engine

1. Oil Not Yet Rising

If the sound occurs when the engine is first started in the morning, it is most likely because the oil has not yet risen to the cylinder head. When the engine is off, the oil pump also stops, preventing lubrication. It is normal for a clunking sound to occur at the beginning, but make sure the sound disappears after a few seconds of running the engine.

2. Worn Shim or Lifter

A worn shim/lifter can cause increased friction between components. This usually occurs when these components are not reinstalled in their original positions after the engine is disassembled.

3. Foreign Object in the Cylinder

Small pebbles or spark plug fragments that enter the cylinder chamber can cause a loud knocking sound. If this is the cause, it is best to have it checked at a repair shop immediately to prevent damage to other components.

4. Valve Clearance Too Wide

Older cars usually experience valve clearance widening. The effect? Knocking noises occur more frequently. The solution is to perform regular adjustments or replace worn components.

5. Weak Flywheel Flange (Automatic Cars)

In automatic cars, a damaged flywheel flange can cause a knocking sound because the plate inside hits the engine body.

6. Damper Pulley Wobble

This component functions to balance the engine's work. If it wobbles, a rough sound will appear every time the engine is accelerated.

7. Weakened Auto Valve

Auto valve springs can weaken over time, causing the gap between the valve and rocker arm to widen, resulting in a "clunking" sound.

8. Engine Knocking

This often occurs when using low-octane gasoline. Combustion becomes incomplete, causing the engine to vibrate and produce a distinct knocking sound.

9. Loose Chain

A loose timing chain or cam chain can also cause strange noises in the engine.

How to Fix Clunking Noises

If your car starts making noises, don't delay in checking it out. These simple steps can help:

• Check the engine oil. Make sure the volume is sufficient and the condition is still clean.
• Reset the valve clearance. Use a measuring tool or take it to a repair shop for precise results.
• Check the crankshaft bearings. If they are worn out, replace them immediately.
• Use quality fuel. Avoid low-octane gasoline, which can cause knocking.
• Consult an authorized repair shop or your regular mechanic. Describe the symptoms and when the noise occurs so that the mechanic can make a more accurate diagnosis.

Conclusion

A knocking sound may seem trivial, but it could be an early sign of a serious problem with your car's engine. With regular maintenance, oil checks, and the right choice of fuel, strange noises can be avoided. Because when the engine is healthy, the ride is more comfortable without any drama on the road.