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When buying a car you wouldn't expect to be handing over your hard-earned cash for a vehicle that has a component which can cause total engine failure under the bonnet. Unfortunately, this is the reality for thousands of owners of certain popular makes and models, who may only discover this when they're compelled to seek repairs.

Wet timing belts, common in some cars manufactured between 2012 and 2021, are at the heart of the issue. These were installed in some of our most sought-after vehicles, including Ford, Peugeot, and Vauxhall.

Despite their introduction to reduce emissions and ensure a smoother ride, they've become a significant nuisance for many drivers.

A wet timing belt serves the same function as a dry one: it synchronises the rotation of the crankshaft and camshaft, thereby ensuring the valves open and close at the correct time. This keeps the engine running smoothly and efficiently.

The distinction lies in the belt's location. A standard timing belt is situated outside the engine housing, while a wet belt resides within it.

Another key difference with this type of belt is its constant lubrication by an oil bath at the bottom of the engine system - hence its name.

So why do some cars have wet timing belts? The theory is that the oil keeps the belt lubricated, allowing both the belt and the engine to operate more smoothly.

In theory, this reduces noise and improves fuel efficiency. Engineers also hoped that the lubrication would help the belts to last longer than their dry counterparts, reducing the change interval - and associated costs - for the owner.

While wet timing belts are fine when they're in good condition and working correctly, once they start to show wear and tear, things can start to go downhill - fast.

Because the rubber belt is in constant contact with the oil, it can cause the belt to degrade more quickly, especially if the wrong type of oil is used.

As a result, it may not last as long as the manufacturer's handbook states it should. This means the belt may fail before the owner of the car even realises there's an issue.

Wet timing belts can also cause another form of engine failure: one that is unique to this type of belt.

As the wet belt gradually picks up wear and tear over time, small particles come off the belt and are picked up by the oil. Because the belt and the oil bath are inside the engine, they are then circulated throughout the rest of the engine system.

This can block or damage crucial engine parts and cause blockages in the system that prevent the engine oil from circulating, both of which will lead to engine failure. This means that owners of cars with wet belts have two major engine failure problems to contend with.

Despite their prevalence, many mechanics are less acquainted with wet belts than other belt types, making it more challenging to identify and rectify issues. The expertise needed to handle these problems can also lead to more complex and expensive repairs.

Consequently, wet belts have attracted a fair amount of criticism in recent years. A quick search for 'wet timing belts' will soon reveal forums brimming with dissatisfied car owners venting their frustrations about the feature and comparing repair costs.

There could be several indicators that a wet engine belt is on the brink of failure. Symptoms might include:.

• Unusual sounds from the engine bay, such as squealing, grinding, or rattling noises when the engine is started or during acceleration.
• The engine light is on
• Engine oil leaks, which could suggest the belt's condition is deteriorating
• Low oil pressure
• The engine misfiring
• The engine performing poorly when idling

To add to the complexity, there may not be any clear signs that the belt is failing or that the oil has been contaminated until it's too late. Ultimately, the only surefire way to check is for a qualified mechanic to carry out a comprehensive visual inspection.

Ford: EcoBoost and EcoBlue vehicles, including the Fiesta, Puma, Ecosport, C-Max, Focus, Transit, Connect, and B-Max.

Peugeot: Models such as the 208, 2008, 308, 3008, 5008, Partner.

Citroen: Berlingo, C3, C4, C5 Aircross. Toyota: Aygo and Proace.

Vauxhall: PureTech engines, including select Corsa, Astra, Granland, Crossland and Combo models. Honda: Civic 1.0 litre Turbo.

It's important to note that not every model listed above will feature a wet belt, as only certain registration years include them. The most reliable way to determine if your vehicle has a wet belt is to consult the owner's handbook or enlist a qualified mechanic to inspect the engine.

While there isn't a straightforward solution to the issue, there are measures drivers can take to protect and prolong the life of their engines if they have a wet timing belt.

Regular inspections: Numerous drivers have reported premature failure or replacement needs for their wet belts, well before the manufacturer's recommended change interval. Therefore, one proactive step owners of wet timing belt engines can take is to assess the condition of the belt well in advance of the scheduled replacement.

Using the correct oil: Utilising the wrong oil can accelerate the degradation of the belt, so it's vital to use the appropriate grade and type of engine oil for your car. This is crucial for the performance and longevity of the belt.

Consult the handbook or reach out to the manufacturer for the most current advice on this matter.

Many drivers have encountered premature failures with their wet belts, leading to the advice of replacing the belt before the recommended change interval. By doing so at the first hint of wear, you can preempt potential issues.

Mark Barclay, Head of Ecommerce at My Motor World, emphasised the importance of diligent maintenance: "Without regular inspections and proper maintenance, wet timing belts can be an engine killer. To avoid costly repairs, owners of cars with this type of belt really have to be on it with their maintenance schedule."

He further advised on the financial aspect of car care: "It might be annoying and expensive to keep checking and replacing the timing belt and changing the oil, but it's still cheaper than a new engine - or even a new car. It's a case of spending little and often to avoid spiralling costs further down the line."

Barclay also offered specific guidance for those with wet timing belts: "If you have a wet timing belt, my advice would be to get regular inspections at a garage that's familiar with them, replace the belt at the first sign of deterioration, and keep that engine oil as clean as possible. And only ever use the exact type of oil that the manufacturer recommends.

"It's hard to imagine what the engineers were thinking when they introduced this feature, given how unpopular it has become. But, it just goes to show that the rigorous testing cars undergo cannot catch every type of fault."

And he issued a word of warning to owners of cars with standard timing belts too.

He added: "You may not have the same issues to contend with as a wet belt, but you still don't want to get complacent, because they can and do fail. So, stick to the change interval given by the manufacturer."

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