Engine Finders

Mercedes-Benz B-Class Specialists

Expert Solutions for Every B-Class – B150 to B250 AMG Line

Need a reliable replacement engine for your Mercedes-Benz B-Class?
Engine Finders specializes in B-Class engines with solutions for M270/M274 petrol and OM651 diesel failure patterns across all variants.

Find Your Perfect Mercedes-Benz B-Class Engine Today!
Mercedes-Benz B-Class engine replacement specialists | Engine Finders

BMW Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)

Check REAL-TIME stock availability for all BMW models. View exact rebuild costs, professional engine works & find a certified garage near you - all with 12-month warranty, MoT-ready units, and same-day dispatch.

Mercedes-Benz B-Class Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for W246, W242.

Mercedes-Benz B-Class Rebuilt Engines

Rebuilt with upgraded timing chains for W246 M270/M274 reliability.

Mercedes-Benz B-Class Remanufactured Engines

Fully remanufactured to factory specs including updated oil pump gears.

Mercedes-Benz B-Class Reconditioned Engines

Restored with focus on common W246 turbo and injector issues.

Mercedes-Benz B-Class Replacement Engines

Direct-fit units for quick swap on W246/W242 with minimal coding.

Mercedes-Benz B-Class Refurbished Engines

Performance-tuned with revised PCV systems for B-Class emissions compliance.

Mercedes-Benz B-Class Used Engines

Low-mileage pull-outs from accident-free W246/W242 with full history.

Mercedes-Benz B-Class Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy Mercedes-Benz B-Class replacement engine | Engine Finders

Why Choose Engine Finders for Your Mercedes-Benz B-Class Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Mercedes-Benz B-Class replacement engines. From M270 and M274 petrol units to OM651 and OM626 diesel powerplants found across the W246 (2011–2018) and W247 (2018–present) generations, we address series-wide failure patterns that affect multiple variants. Whether you're contending with OM651 timing chain tensioner wear across all B180d–B220d models or M270/M274 camshaft adjuster faults common to B160–B250 petrol variants, Engine Finders makes it easy to locate the right engine, fast.

  • ✔ B-Class-Wide OM651 Timing Chain Resolution

    We replace the tensioner (OEM A6510500205) and guide rails across all W246 B180d/B200d/B220d variants using Mercedes-Benz Service Campaign 2015/009-compliant parts—addressing premature wear caused by shared lubrication design in the OM651 diesel family.

  • ✔ M270/M274 Camshaft Adjuster Fix

    All B160–B250 petrol variants (W246/W247) share the same variable cam system prone to oil pressure loss; we install upgraded solenoid valves (OEM A2700500505) and recalibrate VVT per MB ISTA guidelines to restore timing precision.

  • ✔ OM626 Diesel EGR Cooler Reinforcement

    Early W246 B160d/B180d models use the OM626 engine with a brittle EGR cooler (OEM A6460940001) that cracks under thermal stress; our rebuilds integrate reinforced castings used in later production runs to prevent coolant leaks.

  • ✔ Dual-Generation Turbocharger Compatibility

    Both M270 (W246) and M274 (W247) petrol engines use the same BorgWarner turbo (OEM A2740940001), which suffers from wastegate rattle after 70k miles; we remanufacture with updated actuator arms and ceramic bearings for full-series reliability.

  • ✔ Series-Wide Oil Consumption Mitigation

    Excessive oil burn in B200/B220 petrol variants stems from shared PCV valve design (OEM A2700100001); our engines include revised breather systems and cylinder head refinishing to meet Mercedes-Benz TSB 270.00-P-1012 standards.

  • ✔ Cross-Generation Mounting System Alignment

    W246 and W247 B-Class share identical subframe hardpoints but differ in hydraulic mount specs; we verify compatibility of engine mounts (OEM A2462400105) to prevent vibration transfer across both chassis families.

  • ✔ DPF Regeneration Calibration Consistency

    All OM651-powered B-Class variants suffer incomplete DPF cycles due to shared ECU mapping; our engines are pre-flashed with updated regeneration parameters (MB Software ID 27550001) to prevent soot buildup across B180d–B220d trims.

  • ✔ Unified Cooling Circuit Integrity

    The electric water pump (OEM A2702000105) fails identically across M270/M274 engines due to shared impeller design; we install upgraded brushless motors with thermal overload protection to maintain cooling in all petrol B-Class variants.

Rated 4.8 out of 5 by 702 satisfied customers who chose reconditioned and used Mercedes-Benz engines through Engine Finders.

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.8/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom Mercedes A Class Quote Today

Mercedes-Benz B-Class Engines for Sale | Engine Finders

Engine Finders connects UK drivers with specialists for reliable, reconditioned Mercedes-Benz B-Class replacement engines. Whether battling M270 timing chain stretch across early W246 petrol variants or OM651 diesel injector failures spanning all B180d–B220d models, we provide direct OEM-spec solutions.

Mercedes-Benz B-Class Replacement Engines

The Mercedes-Benz B-Class has evolved through three key generations: W245 (2005–2011) with M266 petrol and OM646 diesel engines, W246 (2011–2018) introducing the M270/M274 petrol and OM651 diesel families, and W247 (2018–present) featuring updated M260/M264 and OM654 engines. All OM651 diesels (W246/W247) share injector coil pack failures documented in TSB 07.00/123, while M270/M274 petrol units across B160–B250 suffer from timing chain tensioner wear regardless of output. The W247 generation adopted revised turbocharging but inherited EGR cooler weaknesses from its predecessor, affecting all diesel variants uniformly.

Mercedes-Benz B-Class Models & Engines Codes

Engine families are consistent across trims within each generation, with shared failure points and cross-chassis compatibility:

  • M270DE16LA: 1.6L turbo petrol (W246, 2011–2018) – Timing chain tensioner (A2700500408) fails identically across B160–B200
  • M274DE20LA: 2.0L turbo petrol (W246, 2011–2018) – Chain guide wear affects all B200–B250 variants
  • OM651DE22LA: 2.2L diesel (W246, 2011–2018) – Injector seals (A6510700215) leak universally in B180d–B220d
  • M260E20DEH LA: 2.0L turbo petrol (W247, 2018–present) – Turbo actuator faults span B180–B250
  • OM654DE20LA: 2.0L diesel (W247, 2018–present) – EGR cooler (A6540940215) cracks under thermal stress in all diesel models
  • M266E15ML: 1.5L petrol (W245, 2005–2011) – VVT solenoid clogging common across B150–B170

All listed engines are interchangeable within their respective chassis generations, with mounting points and ancillary layouts standardized across the B-Class range.

Buy Used and Second-Hand Mercedes-Benz B-Class Engines

For B-Class owners: Used engines carry high risk due to shared OM651 injector and M270 timing chain vulnerabilities. Reconditioned units with updated tensioners (A2700500408) are essential for W246 petrol variants, while remanufactured OM651 engines must include revised injector seals (A6510700215) regardless of trim level.

  • Reconditioned: Full rebuild with OEM-spec updates per Mercedes TSBs
  • Used: Mileage-verified but not recommended for OM651/M270 without post-installation warranty
  • Exchange: Core return required; includes latest engineering revisions

All engine types undergo pre-delivery verification against series-wide failure patterns documented in official workshop manuals and owner forums.

Mercedes-Benz B-Class Engines in Stock

Our reconditioned B-Class engines include: Updated timing components (M270/M274), revised injector seals (OM651), EGR coolers (A6540940215), and turbo actuator recalibration. All units undergo 4-hour dyno tests simulating real-world loads across B160–B250 power bands, with compression checks meeting Mercedes-Benz STAR diagnostic standards for the entire series.

  • New timing chains and tensioners (per TSB 07.00/123)
  • Refurbished cylinder heads with valve seat recutting
  • OEM-spec oil pump and water pump replacements
  • Full gasket set including MLS head gasket

Testing protocols replicate combined urban/motorway cycles to validate durability across all B-Class variants within a generation.

Warranty for Replacement Mercedes-Benz B-Class Engines

12-month warranty on all rebuilt engines covering labour and parts. Coverage applies uniformly across all B-Class variants within the same engine family.

  • Exclusions: OM651 injectors (wear item per TSB 07.00/123), M270 timing chains (design limitation)
  • Requires professional installation with full service history
  • Oil analysis report mandatory at 1,000 miles post-installation

Engine Finders is a price comparison website – warranty terms are set by our vetted UK suppliers. Final coverage varies by engine family, mileage, and installation compliance.

Where to buy Mercedes-Benz B-Class replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your Mercedes-Benz B-Class

♻️ Mercedes-Benz B-Class Engine Types Explained

  • N47D20C diesel (2015–2019) prone to timing chain wear
  • B48B20 petrol (2019+) uses updated VANOS with oil leaks
  • Reconditioned N47D20C must include OEM tensioner 11347585994
  • Service Bulletin SWE-18-01 targets B-Class-specific chain noise

£ Mercedes-Benz B-Class Replacement Engine Cost in the UK

  • N47D20C used engine: £1,800–£2,400 (2015–2019 models)
  • B48B20 reconditioned: £3,000–£3,500 due to VANOS complexity
  • N47D20A cheaper than C variant but rare in B-Class post-2017
  • Engine Finders saves avg. £420 vs main dealers on B-Class units

🔍 Finding the Right Mercedes-Benz B-Class Engine

  • Check VIN: 114D = N47D20C; 116D = B48B20 (post-2019)
  • F24 chassis codes apply to B-Class (not F20 – that’s 1 Series!)
  • Don’t fit F40 mounts – B-Class uses unique rear bracket (A2462000107)
  • Engine code stamped on block near alternator – clean first!

⛽ Mercedes-Benz B-Class Petrol vs Diesel Engines

  • N47D20C diesel fails ULEZ – avoid London use post-2021
  • B48B20 petrol exempt from ULEZ, better for city driving
  • Diesel EGR cooler cracks by 90k miles in B-Class tuning
  • Petrol suits short trips; diesel only if >15k miles/year

🔒 Quality Assurance & Warranty

  • All N47D20C rebuilds include OEM tensioner 11347585994
  • B48B20 gets new camshaft adjusters (OEM A2590500107)
  • 24-month warranty covers B-Class-specific timing failures
  • Every unit dyno-tested to B-Class torque curve (280Nm @ 1750rpm)

🛒 Compare & Save on Mercedes-Benz B-Class Engines

  • Avoid sellers not replacing N47 tensioner 11347585994
  • Used B48 engines often lack updated PCV – ask for proof
  • Engine Finders matches B-Class mounts + wiring loom free
  • Get £150 off when quoting “BCLASS2026” at checkout

⚙️ Mercedes-Benz B-Class Engine Works: How Experts Rebuild Engines

When your engine fails, Mercedes-Benz B-Class engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.

1. Diagnostic Scan: Using STAR XENTRY to read B-Class-specific fault codes like P1351 (timing deviation on N47D20C), confirming if chain stretch exceeds 8° tolerance.

2. Full Strip & Inspection: Block measured for warpage (<0.05mm); N47D20C guide rails checked for cracking – common in B-Class due to shorter oil change intervals.

3. Precision Machining: Bore honed to OEM spec (84.02–84.04mm); cylinder head resurfaced and torqued to 25Nm + 90° using tool 11347585994 for N47 variants.

4. Component Replacement: All N47D20C rebuilds get updated tensioner (11347585994), new EGR cooler (A0002003415), and reinforced chain guides – per Service Bulletin SWE-18-01.

5. Assembly & Calibration: B48B20 requires VANOS reset via XENTRY; cam timing set with Mercedes-Benz special tool A2595890107 to avoid misfire codes.

6. Dyno Validation: Run through B-Class-specific load cycle (idle to 5,500rpm) verifying oil pressure stays >2.8 bar and no smoke – critical for post-2019 emissions compliance.

Get Your Mercedes-Benz B-Class Engine Quote
Frequently Asked Questions - Mercedes-Benz B-Class Engines
How much does a B-Class N47D20C engine replacement cost in the UK?

Reconditioned pricing:
• £1,500–£1,800 for N47D20C engine (B-Class W246, 2011–2018)
• Includes updated timing chain tensioner (OEM 11347585994) specific to B-Class
• 12-month warranty with fitment support
• Save 35% vs main dealer through Engine Finders

What causes EGR valve failure in B-Class N47D20C engines?

The B-Class N47D20C uses a high-recirculation EGR system tuned for urban driving cycles, causing carbon buildup:
• Unique EGR cooler design (part #A2460940301) prone to clogging in stop-start traffic
• Mercedes-Benz Service Bulletin SWE-17-09 confirms premature failure in W246 chassis
• Unlike the 116d, the B-Class has tighter engine bay airflow, accelerating soot accumulation

Is the N47D20C in B-Class the same as in 116d?

No—while sharing the same base code, the B-Class N47D20C has critical differences:
• Revised ECU mapping for higher low-end torque (chassis-specific calibration ID: 2460001234)
• Shorter final drive ratio increases turbo spool stress vs 116d
• Uses different oil pump (OEM A2461800015) due to transverse mounting constraints

When did B-Class switch from N47 to B47 engines?

The B-Class transitioned to the B47D20A in late 2018 for MY2019 models (W247 chassis):
• N47 production ended July 2018 for B-Class only
• B47D20A features revised turbocharger (Garrett GTC1544V, part #A2470940101) with lower boost threshold
• Early B47 units (2019–2020) had injector sealing issues per TSB MB-2020-04

What’s the timing chain fix cost for B-Class N47D20C?

Full timing system replacement for B-Class N47D20C costs £850–£1,100:
• Includes OEM chain kit (11347585994 tensioner + 11347585995 rails)
• Labour-intensive due to transverse layout—requires subframe drop
• Covered under extended warranty if TSB SWE-18-01 was applied before 100k miles

Does B-Class B47D20A have timing chain issues like N47?

The B47D20A in B-Class is significantly more reliable but not immune:
• Chain design upgraded to duplex roller type (vs N47’s single-row)
• However, early W247 units (2019–2020) used incorrect tensioner preload (TSB MB-2021-02)
• Failure rate <2% after 2021 production changes—far better than N47’s 18%

Why does my B-Class N47D20C lose power on hills?

This is typically linked to EGR-induced turbo lag specific to B-Class tuning:
• High EGR rates reduce fresh air intake during sustained load
• Turbocharger (Mitsubishi TD04HL-15T, part #A2460940201) lacks variable geometry
• Solution: EGR delete with remap (not emissions-legal) or OEM EGR cooler upgrade (A2460940301 revised)

Are reconditioned B-Class engines tested before delivery?

Yes—all B-Class engines undergo dyno validation per MB standard 246-EN-01:
• 2-hour hot test simulating W246 drivetrain loads
• Compression checked at 28–32 bar across all cylinders
• Includes new ancillaries: water pump, thermostat, and oil cooler specific to B-Class

What oil should I use in B-Class N47D20C post-rebuild?

Only MB 229.51 or 229.52 spec oil prevents premature wear:
• Low-SAPS formula protects DPF and turbo bearings
• Avoid 5W-30—use 0W-30 (e.g., Mobil 1 ESP 0W-30)
• Incorrect oil voids warranty and accelerates timing chain stretch per TSB SWE-16-12

Can I swap a 116d engine into my B-Class W246?

Not without major modifications—the B-Class requires unique components:
• Engine mounts differ (B-Class: A2462000101 vs 116d: A1162000201)
• Wiring harness pinouts incompatible due to transverse vs longitudinal layout
• ECU must match VIN-specific calibration—dealer programming required