Causes and Symptoms of a Bad Flywheel

flywheel is an integral part of a car engine

  • Symptoms
  • Causes
  • Replacement Cost
  • FAQs

Every manual transmission vehicle relies on a crucial yet often overlooked component known as the flywheel. Acting as a mechanical powerhouse, the flywheel ensures smooth engine operation and seamless gear changes. However, like any other vehicle part, flywheels can deteriorate over time, leading to a range of symptoms that shouldn’t be ignored. Let’s explore the common causes and symptoms of a bad flywheel, shedding light on the importance of timely diagnosis and replacement.

Symptoms of a Bad Flywheel

Knowing the signs and symptoms of a bad flywheel enables you to promptly address the issue by opting for a new or used replacement flywheel. This proactive approach ensures your safety while driving. Here’s what to keep an eye out for.

Slipping Gears

One prominent sign of a failing flywheel is gear slippage. If you notice that the engine speed (RPM) increases rapidly without a corresponding increase in ground speed when shifting gears, it could indicate a slipping flywheel. This may be akin to a slipping clutch and if left unaddressed, it can damage the clutch over time. This is why, you must keep an eye on the signs of bad car clutch.

Difficulty Changing Gears

A severely damaged flywheel might hinder your ability to change gears and your car won’t go into correct gear. This symptom suggests extensive wear and other transmission components may also be compromised. In extreme cases, the vehicle may become undriveable, emphasising the urgency of addressing the issue promptly.

Burning Smell

Damaged teeth on the flywheel can cause car starting issues
A malfunctioned flywheel can cause burning odour

An unusual burning smell inside the cabin could be attributed to several issues and a bad flywheel is one potential culprit. Excessive friction in the clutch due to oil or grease contamination on the flywheel’s friction surface can generate heat, leading to a noticeable burning odour.

Unable to Start or Inconsistent Starts

Damaged teeth on the flywheel can impede its engagement with the starter motor, resulting in difficulties starting the vehicle. Inconsistent starts or outright failure to start are clear indicators of a potential flywheel issue and prompt attention is crucial to avoid further complications.

Engine Stalling

A lightweight aftermarket flywheel may lead to easier vehicle stalling and a rough idle. The rapid drop in engine speed, especially with very light flywheels, can cause stalling even when pushing the clutch in. This symptom emphasises the importance of selecting a flywheel appropriate for the car’s mechanical components.

Vibrations of the Clutch 

As a flywheel degrades, vibrations transmitted through the clutch or multi-plate clutch system may become pronounced. Over time, excessive runout can warp the flywheel’s surface, contributing to these vibrations. Suppose the flywheel has been subjected to overheating or prolonged use with a worn-out clutch. In that case, irreversible damage may occur, manifesting as a bluish colour, hairline cracks, or smeared metal on the surface.

Engine Vibrations with Clutch Engaged

An unbalanced flywheel can induce vibrations throughout the powertrain, even when the clutch is engaged. Proper installation, torque specifications and balancing are essential to prevent the flywheel from disintegrating or coming loose while driving, which could pose serious safety risks.

What Causes Damage to a Flywheel

Several factors can contribute to the damage of a flywheel
Contamination and overheating can cause due to a faulty flywheel

Several factors can contribute to the damage of a flywheel. Here are some common causes:

Friction and Wear

Continuous engagement and disengagement of the clutch lead to friction between the flywheel and the clutch disc. Over time, this friction can wear down the surface of the flywheel, affecting its performance.


Exposure to oil or grease can contaminate the flywheel’s friction surface. This contamination reduces the grip between the flywheel and the clutch, potentially causing slipping and overheating.


Excessive heat generated during aggressive driving, prolonged use with a slipping clutch, or other factors can overheat the flywheel. This heat can lead to warping, discolouration and the formation of cracks on the flywheel’s surface.

Clutch Issues

A worn-out or damaged clutch can impact the flywheel’s performance. Clutches that are worn down to the rivets can cause significant damage to the flywheel over time.


Improper or unsafe driving techniques, such as riding the clutch or aggressive shifting, can contribute to premature wear and damage to the flywheel. Moreover, operating the vehicle at consistently high RPM levels, especially bad manual car driving habits can accelerate wear and contribute to flywheel damage.

Imbalanced Components

If the flywheel is not properly balanced or if there are issues with the clutch components, it can lead to vibrations and increased stress on the flywheel, resulting in damage.

Teeth Damage

The teeth on the flywheel that engages with the starter motor can get damaged over time. This damage can make it difficult for the starter motor to engage and your car may take longer to start.

Incorrect Installation

Improper installation of the flywheel or related components can lead to misalignment, imbalance, or inadequate torque, all of which can contribute to flywheel damage.

However, regular maintenance, proper driving techniques and addressing clutch issues promptly can help mitigate some of these factors and prolong the life of the flywheel.

Flywheel Replacement Cost in the UAE

The cost of replacing flywheel depends on the repair shop
The new flywheel price starts from AED 1,000

The cost of replacing a flywheel varies based on the vehicle’s make and model. The price of a car flying wheel starts from AED 1,000. However, the labour cost depends on the car service providers. Considering the interconnected nature of the components, it’s advisable to replace related parts such as the clutch, clutch fork and rear main seal during the flywheel replacement.

Can You Drive with a Bad Flywheel

While it’s technically possible to drive with a bad flywheel, it’s not advisable. The flywheel plays a crucial role in smoothing out power transfer from the engine to the wheels. Any issues with the flywheel can have a ripple effect, causing damage to the clutch components, crankshaft and even the engine.

Even if the damage seems minor, driving with a bad flywheel can lead to more severe and costly problems in the future. If you are unsure about your flywheel’s condition, it’s wise to have it inspected by a trusted professional. They can assess the situation and advise whether a flywheel replacement is necessary.


How much does a flywheel cost in the UAE?

The starting price of a flywheel in the UAE is between AED 1,000 to AED 1,300.

How do I know if my car’s flywheel is bad?

You can identify a bad flywheel when vibrations intensify and transmit to the pedal. If you are experiencing issues with flywheel vibrations, you may notice an exacerbation of the problem during gear changes or acceleration. As the underlying issue progresses, you might also detect vibrations around the pedal area, signalling a potential deterioration in the flywheel’s condition.

What does a bad flywheel sound like?

A faulty flywheel can produce rattling, clanking, whirring, grinding, clicking, tapping, or squealing noises, depending on the specific issue. Some of them include loose bolts and damaged teeth. If you suspect a problem, consult a mechanic for proper diagnosis and repair.

This is all about the causes and symptoms of a faulty flywheel. Understanding the causes and symptoms of a bad flywheel is crucial for maintaining the optimal performance and safety of a manual transmission vehicle. Regular inspections, prompt diagnosis and timely replacements are key to preventing further damage and ensuring a smooth driving experience. If you notice any of the mentioned symptoms, consult with a qualified mechanic to address the issue before it escalates.

When you plan to buy a used car in the UAE, make sure you take a test drive and check for any signs of a bad flywheel. This will help you avoid replacement costs.

Besides, you can also check these popular SUVs with manual transmission for your next purchase.

Keep yourself informed by following the car blogs on dubizzle for additional tips and insights.