Mercedes Benz V Class V250d / V300d Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Mercedes Benz V Class V250d and V300d engine specialists. Compare prices on reconditioned, rebuilt and used OM651 and OM654 diesel engines - supply & fit available nationwide for W447 generation V Class models.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £3,100 to £5,900
Used from £1,800 · Reconditioned from £2,800 · Common codes: OM651.921, OM651.941, OM654.910, OM654.920
From £1,800
Tested, bare/short engine
From £2,800
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz V Class V250d / V300d Replacement Engineto Finding the Best Mercedes Benz V Class V250d / V300d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes V Class V250d / V300d - Engine History & Specs at a Glance
The Mercedes Benz V Class V250d and V300d represent the high-output diesel options in the W447 generation V Class range. Early models (2014-2019) were powered by the OM651 2.1-litre twin-turbo diesel, while facelift models (2019-present) received the modern OM654 2.0-litre diesel - delivering 190-240hp and exceptional torque for executive transport, airport transfers and luxury family travel.
Variant HistoryMercedes V Class V250d / V300d - Engine History & Specs at a Glance
The Mercedes Benz V Class V250d and V300d represent the high-output diesel options in the W447 generation V Class range. Early models (2014-2019) were powered by the OM651 2.1-litre twin-turbo diesel, while facelift models (2019-present) received the modern OM654 2.0-litre diesel - delivering 190-240hp and exceptional torque for executive transport, airport transfers and luxury family travel.
Mercedes V Class V250d / V300d
Fuel TypeDiesel
Engine Size2.1L (OM651) - 2.0L (OM654)
Power Output Range190-240hp across the V250d and V300dEngine History Timeline
W447 V Class launched with OM651.921 (V250d 204hp) and OM651.941 (V300d, 240hp), 7G-TRONIC automatic transmission
Facelift introduces updated emissions calibration
OM654.910 (V250d 190hp) and OM654.920 (V300d, 237hp) replace OM651 in facelift models
OM654.920 refined for Euro 6d emissions compliance
Key Specs Snapshot
Fuel TypeDieselEngine Size2.1L (OM651) - 2.0L (OM654)Power Output Range190-240hp across the V250d and V300dTorque Range400-500NmYears Produced2014-presentEvery high-output diesel engine fitted to the Mercedes V Class V250d and V300d is covered below, with UK rebuilt pricing and known failure points from real owner experience.
Mercedes V Class V250d / V300d Engine Codes - Specifications & Replacement CostMercedes V Class V250d / V300d Engine Codes - Specifications & Replacement Cost
2.1L Diesel (2014-2019)
Power Output204 hp (150 kW) @ 4,200 rpmTorque500 NmDisplacement2,143ccConfigurationInline-4, DOHC, common-rail direct injection, twin-turboYears Fitted2014-2019
Compatible Trim Levels
- V250d
- V250d Sport
- V250d AMG Line
- V250d 7-Seater
- V250d Long Wheelbase
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,800-£3,200
Reconditioned
Addressed known issues, tested
£2,800-£4,200
Rebuilt
Full teardown, upgraded internals
£3,100-£4,900
Common Failure
The OM651.921's twin-turbo configuration places significant strain on the timing chain system. Timing chain tensioner failure and injector seal degradation are documented issues on higher-mileage examples.
The Mercedes V Class V250d and V300d are powered by two of Mercedes' most capable diesel engines - the OM651 2.1-litre twin-turbo and the OM654 2.0-litre modular diesel. While both offer impressive performance and refinement, they have developed well-documented reputations for specific failures. Timing chain tensioner wear dominates OM651 replacement demand, while OM654 EGR cooler crystallisation and high-pressure fuel pump issues drive repair enquiries on facelift models. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common V250d and V300d engine failures, what they cost to fix, and when replacement is the smarter financial decision.
Why the V250d / V300d Rattles on Cold Start
Affected Vehicles
Mercedes V Class V250d (OM651.921) and V300d (OM651.941), 2014-2019
Typical Failure Mileage
60,000 - 90,000 miles
Root Cause
The OM651's single most critical failure point is the timing chain system. A faulty tensioner allows oil pressure loss, causing chain slack and a characteristic rattle on cold start. The chain stretches and guides wear over time. If ignored, the chain can jump teeth, leading to catastrophic valve and piston interference. The chain tensioner has been revised multiple times, primarily affecting older OM651 engines.
Why It Happens
The OM651's single most critical failure point is the timing chain system. A faulty tensioner allows oil pressure loss, causing chain slack and a characteristic rattle on cold start. The chain stretches and guides wear over time. If ignored, the chain can jump teeth, leading to catastrophic valve and piston interference. The chain tensioner has been revised multiple times, primarily affecting older OM651 engines.
Dealer (parts + labour)
£800-£1,200
Specialist (parts + labour)
£400-£700
What it involves
Replace tensioner and seal only - engine-in-situ
Suitability
Only viable if caught very early with no chain stretch
1 - 2 daysDealer (parts + labour)
£1,900-£2,800
Specialist (parts + labour)
£1,200-£1,800
What it involves
Engine-out replacement of chain, tensioner, guides, sprockets
Suitability
Required if rattle is persistent or chain has stretched
1 - 2 daysDealer (parts + labour)
£8,500-£10,000
Specialist (parts + labour)
£3,500-£5,200
What it involves
Supply & fit rebuilt OM651 with upgraded tensioner, new timing components, 12-month warranty
Suitability
Full long-block warranty. Required if chain has jumped or guides have failed
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor - Tensioner Replacement Minor | £800-£1,200 | £400-£700 | Replace tensioner and seal only - engine-in-situ | Only viable if caught very early with no chain stretch | 1 - 2 days |
 Major - Full Chain & Tensioner Kit Best Value | £1,900-£2,800 | £1,200-£1,800 | Engine-out replacement of chain, tensioner, guides, sprockets | Required if rattle is persistent or chain has stretched | 1 - 2 days |
Full Replacement - Rebuilt OM651 Engine Best Value | £8,500-£10,000 | £3,500-£5,200 | Supply & fit rebuilt OM651 with upgraded tensioner, new timing components, 12-month warranty | Full long-block warranty. Required if chain has jumped or guides have failed | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical W447 V Class V250d or V300d is worth £18,000-£40,000 depending on age and mileage - the full replacement cost of £3,500-£5,200 is modest relative to vehicle value for most examples. For vehicles worth under £12,000, evaluate repair options carefully.
Our Recommendation
Our Recommendation
If you are hearing a metallic rattle at cold start on a V250d or V300d under 90,000 miles, a preventative timing chain replacement is the most cost-effective route. However, if the chain has already jumped timing or damaged the cylinder head, a full rebuilt OM651 engine is the only financially sensible option to avoid repeated downtime and costly collateral repairs.
Don't Let Engine Failure Write Off Your Mercedes V Class V250d or V300d
A failed high-output diesel engine doesn't have to mean the end of your V Class. Whether you're dealing with OM651 timing chain tensioner failure, OM654 EGR cooler crystallisation, or fuel system issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes V Class specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.
Compare rebuilt OM651 engine prices for your Mercedes V250d / V300d
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes V Class V250d or V300d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mercedes V Class V250d / V300d Engine ReplacementFrequently Asked Questions
Question 1How much does a Mercedes V Class V250d or V300d engine replacement cost in the UK-
A V250d or V300d engine replacement typically costs between £3,100 and £5,900 depending on engine code (OM651.921, OM651.941, OM654.910 or OM654.920), condition type, and whether fitting is included.
- Rebuilt OM651.921 (V250d, 2014-2019): £3,100-£4,900 supply only
- Rebuilt OM651.941 (V300d, 2014-2019): £3,300-£5,200 supply only
- Rebuilt OM654.910 (V250d, 2019-2024): £3,200-£5,400 supply only
- Rebuilt OM654.920 (V300d, 2019-2024): £3,500-£5,900 supply only
- Used engines from breakers: £1,800-£4,500 but higher risk
- Labour for supply & fit adds £800-£1,500 to any engine price
Question 2What causes the OM651 timing chain rattle on cold start in a V250d or V300d-
The OM651 timing chain rattle is caused by tensioner failure allowing oil pressure loss, leading to chain stretch and guide wear. The chain tensioner has been revised multiple times, primarily affecting older OM651 engines.
- The chain is at the rear of the engine - most repairs require engine removal
- Early W447 models (2014-2016) are most vulnerable to timing chain issues
- Cold-start rattling indicates chain elongation requiring full engine-out replacement
- Rebuilt OM651 units include updated tensioner seals and hardened guide rails as standard
- The OM651's single most critical failure point is the timing chain system
Question 3What are the signs of OM654 EGR cooler failure on a facelift V250d or V300d-
The OM654's EGR cooler typically shows warning signs before complete failure.
- Loss of power and rough idle
- Increased fuel consumption
- Coolant loss with no visible external leak
- Emissions warning lights illuminated
- White smoke from the exhaust
Question 4Should I repair or replace my V250d or V300d engine-
Repair if the failure is isolated (e.g., timing chain tensioner on OM651, EGR cooler on OM654, HPFP). Replace if there's bottom end damage, bore scoring, or catastrophic timing chain failure.
- OM651 timing chain replacement: £1,200-£1,800 - do this if rattle is persistent
- OM654 EGR cooler replacement: £950-£1,350 - catch it early
- Full OM651 rebuild: £3,500-£5,200 - for catastrophic failure or 120k+ miles
- Full OM654 rebuild: £3,500-£5,500 - for catastrophic failure or 100k+ miles
- Given V Class V250d / V300d values (£18,000-£40,000), a rebuilt engine is typically good value
Question 5How do I know which engine code my V250d or V300d has-
Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix.
- V5C log book shows full engine number with code prefix
- Engine code stamped on a machined flat on the engine block - on OM651, front of the block on the driver's side
- V250d (2014-2019): OM651.921 (2.1L diesel, 204hp)
- V300d (2014-2019): OM651.941 (2.1L diesel, 240hp)
- V250d (2019-2024): OM654.910 (2.0L diesel, 190hp)
- V300d (2019-2024): OM654.920 (2.0L diesel, 237hp)
Question 6Can I fit a used V250d or V300d engine myself-
We strongly advise against DIY fitting on a V Class diesel. The W447 engine bay layout, 7G-TRONIC or 9G-TRONIC gearbox alignment, and ECU coding requirements demand specialist equipment and expertise.
- Engine removal requires proper lifting equipment and subframe lowering
- ECU coding and injector calibration require Mercedes-Benz Star Diagnosis tools
- AdBlue system recalibration needed on Euro 6 models
- Specialist supply & fit costs £800-£1,500 - worth every penny
Question 7What warranty comes with a reconditioned V250d or V300d engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on OM651 and OM654 rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- OM651 and OM654 rebuilds often include 24-month warranty
- All warranties cover parts, labour, and MOT compliance
- Extended warranties available at point of purchase
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12-Month Warranty on every rebuilt V250d and V300d engine
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