DV5 Engine Problems Explained: The 7mm Timing Chain Issue & Our 8mm Chain Upgrade
The DV5 1.5 diesel engine (used across Ford, Peugeot, Citroën and DS vehicles) is a modern, efficient engine found in many popular cars and vans. While it delivers good fuel economy and low emissions, it has developed a well-known weakness that owners and garages are increasingly aware of — the 7mm timing chain.
At Approved Engines, we regularly see DV5 engines fail not because of poor maintenance, but because of an under-engineered timing chain design. This article explains the issue clearly and how we upgrade the engine using an improved 8mm timing chain solution.
What is the DV5 engine?
The DV5 is a 1.5-litre diesel engine used widely across:
- Ford (EcoBlue variants)
- Peugeot
- Citroën
- DS Automobiles
It is commonly found in vehicles such as:
- Transit Connect / Courier
- Peugeot Partner / Expert
- Citroën Berlingo / Dispatch
- Various passenger cars using the BlueHDi system
While efficient and refined, the DV5 uses a rear-mounted timing chain, which has proven to be a critical weak point.
The 7mm timing chain problem
The original DV5 engine was fitted with a 7mm timing chain, which in real-world use has shown a tendency to:
- Stretch prematurely
- Wear faster than expected
- Lose correct timing
- Cause rattling noises on cold start
- Trigger engine management faults
- In worst cases, lead to major internal engine damage
Because the chain is located at the rear of the engine, early warning signs are often missed. By the time symptoms are obvious, significant damage may already have occurred.
This issue is not driver-caused and is frequently seen on vehicles with:
- Full service history
- Correct oil specifications
- Normal mileage for age
Why the 7mm chain fails
In simple terms, the original 7mm chain is too narrow for the stresses placed on it in modern DV5 applications.
Contributing factors include:
- High torque at low RPM
- Emissions-driven engine mapping
- Extended service intervals
- Stop-start driving conditions
Over time, the chain stretches beyond tolerance, affecting cam timing and reliability.
Our solution: upgrading to an 8mm timing chain
At Approved Engines, we don’t simply replace DV5 engines like-for-like.
Where applicable, we upgrade the engine by fitting an improved 8mm timing chain.
What the 8mm chain upgrade does:
- Increased chain width for added strength
- Improved resistance to stretch
- Better long-term timing stability
- Reduced risk of repeat failure
This upgrade addresses the root cause of the issue, not just the symptoms.
Why this matters if you’re replacing a DV5 engine
Fitting another DV5 engine with the original 7mm chain can leave you exposed to the same failure all over again.
By upgrading to an 8mm chain:
- You improve long-term reliability
- You reduce the likelihood of future timing issues
- You protect your investment
This is especially important for:
- Commercial vehicles
- High-mileage users
- Fleet and trade customers
DV5 engines supplied by Approved Engines
All DV5 engines supplied by Approved Engines are:
- Built to OEM specification
- Carefully inspected and prepared
- Upgraded where appropriate with the improved timing chain solution
- Supplied with warranty for peace of mind
VIN confirmation is always carried out to ensure the correct DV5 variant is supplied for your vehicle.
Experiencing DV5 timing chain symptoms?
If your vehicle is showing:
- Rattling noises
- Timing-related fault codes
- Loss of performance
- Engine warning lights
It’s important not to ignore the signs. Early action can prevent far more costly damage.
Speak to Approved Engines
If you’re looking for a replacement DV5 engine or want expert advice on the DV5 timing chain issue, our team is here to help.
We specialise in problem engines, and our upgrades are designed to fix known weaknesses — not repeat them.
👉 Contact Approved Engines today for DV5 engine advice, supply, or supply & fit options .
https://approvedengines.com/products/brand-new-ford-transit-connect-1-5-tdci-ecoblue-euro-6-engine
