
Wet timing belts are belts submerged in oil inside an engine. They were introduced to reduce emissions and increase fuel economy. However, they have caused several issues for drivers, including the early deterioration of the belt, which can lead to engine damage. They are also more challenging to replace than dry belts. Wet timing belts are found in engines by Ford, Honda, VW, Citroen, Peugeot, and the Volkswagen Group.
| Characteristics | Values |
|---|---|
| Purpose | To reduce emissions, increasing fuel economy by just over 1% |
| Function | To ensure the camshafts and crankshaft pulleys are kept in sync |
| Location | Inside the engine, submerged in oil |
| Composition | Rubber with the structure reinforced by corded fibres and a fabric covering |
| Maintenance | Requires advanced knowledge and skills to change compared to a dry belt |
| Replacement Interval | Ford recommends 144,000 miles or 120 months; Vauxhall recommends 6 years or 60,000 miles |
| Issues | Premature wear due to impurities in the oil, leading to material clogging the oil sump filter |
| Cost | Replacing the belt can cost upwards of £2000 |
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What You'll Learn

Wet belts are used to reduce emissions
Wet belts, also known as timing belt in oil systems, are used to reduce emissions from vehicles. They are fully encased within the engine, as opposed to 'dry' systems, which are positioned outside of the engine crankcase. Wet belts were introduced to reduce component weight, decrease engine size, maximise efficiency, and meet emissions targets.
The use of a wet belt offers a 30% reduction in friction loss, which in turn reduces emissions and increases fuel economy by just over 1%. The belt is constantly lubricated by the oil, reducing the noise it makes and extending its life. The oil also helps to cool the belt, which can get hot at high speeds, further prolonging its longevity.
However, there are some drawbacks to using wet belts. One issue is that impurities in the oil, such as soot or crystalline, can lead to premature belt wear. This can cause material from the belt to detach and clog the oil sump filter, resulting in oil starvation. Additionally, the process of changing or performing maintenance on a wet belt is more complex and time-consuming than on a dry belt, as the engine needs to be drained of oil and mostly disassembled to access the belt.
Despite these issues, wet belts remain a popular choice for vehicle manufacturers such as Ford, PSA, and Volkswagen, as they provide an effective means of reducing emissions and improving fuel efficiency.
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They are harder to replace than dry belts
Wet timing belts are harder to replace than dry belts. This is because they are installed inside the engine and are submerged in oil. To access the belt, the chamber needs to be drained of oil, and most of the engine needs to be disassembled. This process is time-consuming and labour-intensive, and it can be challenging to detect when a replacement is needed.
Wet timing belts are designed to reduce emissions and increase fuel economy. They are lubricated by an oil bath, which is intended to reduce wear and noise, as well as friction. However, the oil can become contaminated with impurities, such as soot, which can cause the belt to wear prematurely. This, in turn, can lead to particles breaking off and clogging the engine oil lines and oil filter, causing significant issues.
While wet timing belts are designed to be more durable, their teeth can still become smooth or break off, leading to belt skipping and engine desync. This can cause catastrophic damage to the engine. Therefore, regular servicing and maintenance are crucial to prolonging the lifespan of a wet timing belt. However, the complexity of accessing and replacing the belt makes this a challenging task.
The process of replacing a wet timing belt is not only time-consuming but also expensive. Taking a car to a main dealer for this work can result in bills exceeding £2000. This has led to frustration among vehicle owners, with some opting to scrap their cars rather than incur such costs. As a result, many owners and mechanics wish automotive companies had stuck with traditional dry timing belts.
In summary, wet timing belts are harder to replace than dry belts due to the additional labour, time, and costs involved. The complexity of accessing and replacing the belt, along with the potential for premature wear and associated engine issues, makes wet timing belts a less desirable option for many vehicle owners and mechanics.
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They can be damaged by impurities in the oil
Wet timing belts are submerged in oil inside the engine. They are designed to reduce emissions, offering a 30% reduction in friction loss and increasing fuel economy by 1%. However, they can be damaged by impurities in the oil, such as soot, crystalline, or other particles. This can cause premature belt wear, with material from the belt coming loose and clogging the oil sump filter, resulting in oil starvation.
Wet timing belts were introduced to reduce emissions and increase fuel economy. They are installed inside the engine and submerged in oil, unlike dry belts, which are typically installed on the outside of the engine. While wet belts are designed to reduce friction and improve efficiency, they can be prone to issues caused by impurities in the oil.
The oil in which the timing belt is submerged can become contaminated with soot, crystalline, or other impurities over time. This contamination can cause the belt to wear prematurely, as the impurities act as abrasives, accelerating the degradation of the belt material. As the belt wears, particles can break off and clog the engine oil lines and oil filter, leading to further issues.
To mitigate the risk of damage caused by impurities in the oil, it is important to maintain the oil level and change the oil at the recommended intervals. Additionally, using the correct oil recommended by the manufacturer can help prolong the life of the wet timing belt. This oil often contains additives that can further protect the belt. However, despite these measures, impurities can still enter the oil, especially in environments with high levels of soot or other contaminants.
Wet timing belts have become a source of frustration for many vehicle owners and mechanics due to the issues caused by impurities in the oil. The belts are difficult to access and replace, requiring the chamber to be drained of oil and much of the engine to be disassembled. This complexity can result in costly repair bills, with some opting to scrap their vehicles rather than incur the expense.
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They are more common in Ford vehicles
Wet belts are fully encased within the engine, while 'dry' systems are positioned outside of the engine crankcase. Wet belts were introduced over 15 years ago by manufacturers like Ford, PSA (now a part of Stellantis), and Volkswagen.
Ford vehicles that feature an EcoBoost or EcoBlue engine will have this type of belt inside. Some of the Ford models that have wet belts include the Ford Fiesta, Ford Focus, Ford Transit Connect Van, and the Ford B-Max. The Ford 1.0-litre EcoBoost engines use a wet belt instead of the traditional timing belt. The wet belt runs inside the engine, while a timing belt runs on the outside.
The wet belt system aimed to reduce overall emissions from cars, offering 30% reductions in friction loss and increasing fuel economy by just over 1%. However, the problems it causes do not outweigh the issues it solves. The main issue is that any minor impurities in the oil, such as soot or crystalline, can lead to premature belt wear. This causes material from the belt to come loose inside the oil and clog the oil sump filter, resulting in oil starvation.
Ford originally claimed that EcoBoost wet belts last up to 150,000 miles or 10 years, but in reality, many fail much sooner. Common reasons for this include oil degradation, heat and friction, oil starvation, and poor maintenance.
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They are located inside the engine
Wet timing belts are located inside the engine. They are submerged in oil, which lubricates them. This is in contrast to dry belts, which are installed on the outside of the engine, protected by a cover.
Wet belts were introduced to reduce emissions from cars. They offer a 30% reduction in friction loss, increasing fuel economy by just over 1%. However, they have been described as a "disastrous technology" that has caused a lot of issues. One of the main issues is that impurities in the oil, such as soot, can lead to premature belt wear. This causes material from the belt to come loose inside the oil and clog the oil sump filter, which can lead to oil starvation and ineffective braking.
Wet belts are also more difficult to replace than dry belts. To access a wet belt, the chamber needs to be drained of oil and most of the engine needs to be disassembled. This means that replacing the belt, or even doing routine maintenance, takes a lot more time and work.
There are no clear signs that a wet belt is failing. Drivers will need to be reliant on factors other than noise to tell if their belt is failing, as any noise generated by the wet belt is dampened by oil. When the timing belt is worn, the engine may have difficulty starting and can run poorly while idling and operate erratically at high speeds.
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Frequently asked questions
A wet pan belt, or a wet timing belt, is a component that sits inside the engine and is lubricated by an oil bath. It is designed to decrease overall emissions from cars.
Wet pan belts are unpopular because they are costly and time-consuming to replace. They are also prone to premature wear and failure, which can cause serious engine damage.
There may be no clear signs that a wet pan belt is failing. However, when the timing belt is worn, the engine may have difficulty starting and can run poorly while idling and operate erratically at high speeds.
The replacement interval for wet pan belts varies by manufacturer. For example, Ford recommends replacement every 144,000 miles or 120 months, while Vauxhall recommends every 6 years or 60,000 miles, whichever comes first.
To prolong the life of a wet pan belt, it is important to maintain the oil level and use the correct oil recommended by the manufacturer. Regular servicing and good driving habits can also help reduce replacement intervals.









































