Mercedes Benz · Diesel
Mercedes OM651 Diesel repair and rebuild
The Mercedes OM651 diesel is fitted to the C Class, E Class, GLC and the Sprinter van, making it one of the most widespread Mercedes engines in the UK. Early versions suffered timing chain failures, and injector seal leaks are a known issue across the range. In Sprinter vans the engine works hard for a living and high mileage wear is a common reason for a rebuild.
45+ years
Over four decades of hands on engine experience.
OEM parts
Original specification parts on every repair.
12 month warranty
Transferable if you sell the vehicle.
From £2,495
Fully repaired after failure, fixed quote.
How this engine fails
Timing chain rattle on start up is the warning sign that should send you straight to a specialist. A snapped chain on the OM651 bends valves and can damage pistons and the cylinder head. Leaking injector seals cause carbon build up, a chuffing noise and eventually damage to the cylinder head around the injector seat. On Sprinters, worn bearings and turbo wear are typical high mileage findings.
Found in these UK models
How we put it right
We rebuild the OM651 in cars and vans with OEM chains, tensioners, valves, bearings and gaskets. Injector seats are recut in our machine shop and the head is pressure tested and skimmed. Sprinter operators benefit from our priority van service and nationwide collection, because we understand downtime costs money. Every rebuild is photographed, documented, test certified and covered by the 12 month transferable warranty.
- Fully repaired after failure from £2,495
- OEM parts on every repair
- Video inspection of the dismantled engine
- Photographic rebuild report and test certification
- 12 month warranty, transferable if you sell
Get a quote for your Mercedes Benz
Tell us the model, the year and the symptoms. An engineer who knows this engine will come back with a fixed price.
Related reading
Before you decide on any repair, read our repair versus used engine guide and the guide to timing chain and belt failure causes. Both were written by the engineers who will work on your engine.
Other engines we repair
The process
How your engine gets rebuilt
Tell us what happened
Call or send the form and describe the symptoms. A rattle, smoke, a warning light or a complete failure. We will ask a few questions about the vehicle and give you an honest first view over the phone.
We collect the vehicle
Our collection service picks the vehicle up directly from your home, your workplace or your garage, anywhere in the UK. Non runners are no problem. Recovery to one of our workshops is all part of the service.
Strip down and video inspection
We dismantle the engine and record a video inspection of every component. You see exactly what failed and why before you spend a penny on parts. Then you approve a fixed written quote.
Rebuild with OEM parts
Our engineers rebuild the engine with OEM parts and photograph every stage. The photographic rebuild report becomes your record of the work and supports your warranty and the vehicle’s resale value.
Test certified and returned
Every rebuild is test certified before the engine leaves the workshop. We return the vehicle to your door with the report, the certification and a 12 month warranty that transfers to the next keeper.
Reviews
Five star rated by UK drivers
Five star rated engine repair and rebuild service
“The video of my stripped engine showed exactly why it failed. The rebuild was finished in a week and the car has been perfect since.”
“My Transit is my living. They collected it from my depot, rebuilt the EcoBlue and had me back working inside ten days.”
“Two garages told me to scrap the car or fit a used engine. Engine Repairs rebuilt it properly and the warranty transferred when I sold it.”