What Is a Hydrolocked Engine? Symptoms Causes and FAQs

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Poor driving habits often lead to vehicle problems, such as engine malfunctions and faulty components. This applies to different practices, even ones that seem harmless, like driving over potholes or water. One potential effect of such habits is hydrolock.

What Is Hydrolock?

Hydrolock is when an engine has too much water in its cylinders. It causes the pistons and other components to seize, leading to mechanical failure or power shortage.

Hydrolock Symptoms

A hydrolocked engine exhibits different symptoms based on the severity of the damage and the amount of water in the pistons. Most of them involve the engine, as its the component most affected by the excess water.

Engine Stalling

Engine stalling happens when the engine turning suddenly stops.

Engine stalling happens when the engine turning suddenly stops. Hydrolock can cause it, as the excess water that gets in the chamber affects the ratio of the air and fuel in the vehicle, decreasing the power of the engine.

Engine Doesn’t Turn Over

Engine turn over is the process of starting your vehicle. It’s when the battery sends an electrical pulse to the spark plugs that cause the ignition to start the engine.

A hydrolocked engine may soak the spark plugs, which leads to the lack of electricity needed to ignite the engine.

Crashing Sounds

The crashing noise you hear when the engine is hydrolocked is due to the water filling the cylinders. It’s often followed by the engine shutting off, then a loud thud. It occurs when water gets into the cylinder, leaving no space for fuel combustion.

Effects of Hydrolock

Besides engine stalling, hydrolock can damage other car components. The severity of the damage depends on the amount of water that got into the system. An excessive amount could leave some parts malfunctioning.

Broken Connecting Rod

The connecting rod or con rod is a part of the engine that connects the piston to the crankshaft. A hydrolocked engine may cause the connecting rod to bend or break, especially if the engine is powerful enough to handle large amounts of water.

A broken connecting rod could also lead to permanent engine damage, as it blows holes through the cylinder head.

Damaged Crankshaft

The crankshaft is essential for engine operation, as it causes linear motion to rotate. Simply put, it converts heat into energy that allows your vehicle to function.

If the connecting rod breaks due to the hydrolock, it can also affect the crankshaft, as it only moves upward. The force of the sudden stop may crack the crankcase, which exposes the shaft. Similarly, hydrolock may also damage the engine bearings.

What Causes Hydrolock?

Excess fluid causes hydrolock, and there are different ways it can get into your engine:

Driving Through Water

Driving through high water could cause it to kick up through the intake. The water soaks into the air filter and the inlet manifold.

The intake removes excess water, but a large amount is too much for it to handle. And as you drive through water, the water in the engine flows into the cylinder until the piston can no longer handle it.

Vehicle Modifications

Some modifications to the intake system put it in a compromising position, making it easier for water to get through the corner of the bumper.

Head Gasket Failure

The head gasket seals the engine’s combustion chamber, allowing your car to build the compression needed to maintain engine power. It also keeps coolant and oil from leaking, which prevents overheating engines.

A damaged or faulty head gasket could lead to hydrolocking, as the coolant can leak into the pistons. One of the most common causes of gasket failure is accelerated thermal expansion.

Injector Leak

The fuel injector pushes fuel into the internal combustion engine. As such, a cracked injector can lead to fuel flooding within the engine.

Ways to Prevent Hydrolock

If the engine is on the verge of hydrolocking, experts can easily detect and prevent it from happening.

Luckily, hydrolock is preventable if you take the proper precautionary steps. Here are some ways you can protect your engine from excess liquid:

Avoid High Water

Driving through flood or any form of high water is the leading cause of hydrolocks. If you find yourself staring down water, slow down and consider if it’s safe to drive through it. Find a different route or carefully drive through the water to prevent getting excess moisture in your engine.

Don’t Park Outside During Heavy Rain

Similarly, avoid parking outside during heavy rain or storms, as they can cause floods. Even if it doesn’t flood, water may naturally seep into the engine.

Avoid Jetting Water Into the Air Filter

If you’re washing your vehicle, don’t spray water near the air filter. Due to the filter’s structure and location, any form of liquid near the area will find its way into the engine and other important components.

Take Your Vehicle to Mechanics for Regular Maintenance

If the engine is on the verge of hydrolocking, experts can easily detect and prevent it from happening. Additionally, the mechanics can also prevent further damage if the engine is already hydrolocked.

How Do Mechanics Fix Hydrolock?

Fixing a hydrolocked engine involves draining the water that seeped into the engine. Here is what you can expect when you have your hydrolocked vehicle repaired:

• Step 1: The water or fluid inside the engine cylinders is drained.
• Step 2: The engine is dismantled and separated from other components.
• Step 3: Engine-related components, such as the bearing, pistons, and cylinders, are inspected.
• Step 4: Faulty parts are replaced.
• Step 5: The vehicle is reassembled and tested to check if the engine is running smoothly.

How Much Does It Cost to Fix Hydrolock?

The price of fixing a hydrolocked engine is quite steep, ranging from $3,000 to $8,000. The final bill depends on the severity of the damage to the engine and other components.

The post What Is a Hydrolocked Engine? Symptoms, Causes, and FAQs appeared first on In The Garage with CarParts.com.

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