How to Replace a Ford Wet Timing Belt – What You Need to Know

If you own or maintain a Ford Transit or another model fitted with a 2.0 or 1.8 EcoBlue diesel engine, you’ve probably heard about the wet timing belt, also known as the belt-in-oil system.

This design runs the timing belt inside the engine oil, which helps reduce noise and friction while improving fuel efficiency. It’s an innovative setup, but when replacement time comes around, it’s a detailed and technical job that needs precision.

🧭 What Is a Ford Wet Belt?

Traditional timing belts run dry outside the engine, but Ford’s wet belt system sits inside the engine and is lubricated by the oil. It’s used in several Ford models including:

• Ford Transit and Transit Custom (2.0L EcoBlue)

• Ford Focus and Mondeo (1.8L and 2.0L EcoBlue)

• Some Ford Ranger models

The benefit of this system is a quieter and smoother engine with less vibration. However, the oil environment can also cause the belt material to deteriorate over time — and when it does, it can cause serious engine problems.

⚠️ Why Timing Belt Maintenance Is Crucial

Over time, the rubber belt absorbs oil, becomes soft, and begins to break down. Small particles of rubber can then clog the oil pickup strainer, restricting oil flow and causing severe internal damage.

A worn belt can lead to low oil pressure, loss of timing, and even complete engine failure. For that reason, the belt should never be left to run past its recommended service life.

Ford originally stated a replacement interval of around 150,000 miles or 10 years, but many experienced technicians now recommend replacing it between 80,000 and 100,000 miles, especially on commercial vehicles used daily.

🔩 Tools and Parts You’ll Need

To replace a Ford wet belt correctly, the following tools and parts are typically required:

• Genuine or OE-quality wet timing belt kit (belt, tensioner, idlers, seals)

• New oil pump belt (where fitted)

• Engine oil and filter

• Locking pin and camshaft alignment tool kit (specific to EcoBlue engines)

• Torque wrench, socket set, and breaker bar

• Engine support or cradle

• Brake cleaner, scraper, and sealant

• Replacement sump gasket or RTV sealant

🧱 Step-by-Step Overview: Replacing the Ford Wet Belt

⚠️ This overview is for general information. Always refer to the official Ford workshop manual and use correct locking tools and torque settings.

1. Preparation

• Disconnect the battery and remove covers, air intake, and other components.

• Drain the oil and remove the sump to expose the lower section of the belt.

• Clean the work area thoroughly to avoid contamination.

2. Access the Timing System

• Remove the auxiliary belt and crank pulley.

• Take off the front timing cover to expose the wet belt.

• Rotate the engine to Top Dead Centre (TDC) and fit the camshaft and crankshaft locking pins.

3. Remove the Old Belt

• Release the tensioner and remove the old belt and idlers.

• Inspect the oil pump belt (if fitted) and replace it as part of the job.

• Clean the housing and ensure no debris or belt material remains.

4. Install the New Belt Kit

• Fit the new tensioner, idlers, and timing belt following the direction of rotation shown on the belt.

• Set the tensioner correctly and torque all bolts to Ford specifications.

• Turn the engine by hand twice and confirm that timing marks still align perfectly.

5. Reassemble

• Refit the timing cover, crank pulley, sump, and any components removed earlier.

• Apply fresh sealant where required and allow it to cure if specified.

6. Refill and Test

• Fit a new oil filter and refill the engine with fresh oil.

• Start the engine and allow it to idle, listening carefully for any unusual noises.

• Check for leaks and verify oil pressure is stable.

🧠 Professional Tips

• Always replace the oil pump belt at the same time it shares the same oil environment and service interval.

• Never reuse old oil when fitting a new wet belt. Contaminants from the old belt can quickly damage the new one.

• Always use locking tools even a slight misalignment can cause major timing issues.

• Shorten intervals if the vehicle operates in tough conditions or covers high mileage annually.

❓ Common Questions About Ford Wet Belts

How do I know if my wet belt needs replacing?

Often, there are no clear symptoms until failure. Warning signs can include low oil pressure, rattling at start up, or debris in the oil. Preventative replacement is the only guaranteed way to avoid damage.

What happens if the wet belt fails?

If the belt deteriorates or snaps, rubber fragments can block the oil strainer, leading to oil starvation and complete engine failure. In severe cases, the engine may need to be replaced.

How long does it take to replace one?

Typically around 6 to 9 hours of workshop time, depending on the model. Transit models often take longer due to tighter engine bays.

Is it a DIY job?

Not usually. This is a precision job that requires specialist tools and technical knowledge. Incorrect timing setup can cause serious damage.

⚙️ Key Takeaways

• Wet timing belts should be replaced well before the maximum interval, especially on high-mileage vans.

• Always use quality parts and fresh oil during the replacement.

• Following the correct procedure prevents oil contamination and protects the engine from costly failure.