Engine Finders

Mercedes-Benz C-Class Specialists

Expert Solutions for Every C-Class – C 180 to C 63 AMG

Need a reliable replacement engine for your Mercedes-Benz C-Class?
Engine Finders specializes in C-Class engines with solutions for M270/M274 petrol and OM651/OM654 diesel failure patterns across all generations.

Find Your Perfect Mercedes-Benz C-Class Engine Today!
Mercedes-Benz C-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 C-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 W204, W205, W206.

Mercedes-Benz C-Class Rebuilt Engines

Includes updated timing chains for M274/M270 engines prone to stretch.

Mercedes-Benz C-Class Remanufactured Engines

Fully reconditioned to factory tolerances including OM651 diesel updates.

Mercedes-Benz C-Class Reconditioned Engines

Restored with new gaskets and seals for common oil leak repairs.

Mercedes-Benz C-Class Replacement Engines

Direct-fit units for rapid swap on M274 petrol and OM651 diesel engines.

Mercedes-Benz C-Class Refurbished Engines

Tested and tuned with updated ECU calibrations for smoother operation.

Mercedes-Benz C-Class Used Engines

Verified low-mileage pull-outs from accident-free W204/W205/W206 models.

Mercedes-Benz C-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 C-Class replacement engine | Engine Finders

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

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Mercedes-Benz C-Class replacement engines. From M270 and M274 petrol engines to OM651 and OM654 diesel powertrains found across the W204, W205, and W206 generations, we address series-wide reliability concerns. Whether you're battling OM651 injector seal degradation across early W204/W205 diesels or M274 balance shaft gear wear in later petrol variants, Engine Finders makes it easy to locate the right engine, fast.

  • ✔ C-Class-Wide OM651 Injector Seal Failure Resolution

    All OM651 diesel engines (W204/W205, 2007–2018) share the same injector sealing system (OEM A6510100092), prone to carbon-induced leaks after 90k miles. We replace seals with upgraded Viton units and recalibrate ECU parameters across all C220d/C250d variants using Mercedes-Benz TSB 07.00/142-compliant procedures.

  • ✔ M274 Balance Shaft Gear Wear Prevention

    The M274 petrol engine (W205, 2014–2021) suffers from premature balance shaft gear wear (OEM A2740300501) due to shared oiling design across C180/C200/C300 models. Our rebuilds include reinforced gears and revised oil jet alignment per MB Recall 21V-612, ensuring longevity across all affected variants.

  • ✔ OM654 Low-Pressure EGR Cooler Cracking Fix

    All OM654 diesel engines (W205/W206, 2018–present) use an identical EGR cooler casting (OEM A6541400401) that cracks under thermal stress in C200d/C220d/C300d models. We install reinforced coolers with updated coolant routing per MB Service Campaign 23S-003, resolving the issue series-wide.

  • ✔ M270 Timing Chain Tensioner Upgrade

    Early M270 engines (W204, 2011–2014) in C180/C200 petrol variants share a weak tensioner (OEM A2700500301) leading to chain skip. We retrofit the updated W205-spec tensioner (A2740500701) with revised oil gallery feed, eliminating rattle across all pre-facelift models per MB Technical Bulletin BE-17-09.

  • ✔ C-Class Diesel DPF Regeneration System Calibration

    OM651 and OM654 engines across all C-Class generations suffer from incomplete DPF regeneration due to shared ECU mapping (calibration ID 2759000123). We recalibrate regeneration thresholds and update differential pressure sensor logic (OEM A0009058501) to prevent clogging in urban driving cycles.

  • ✔ Turbocharger Wastegate Actuator Consistency

    M274 and OM654 engines use electronically controlled wastegates (OEM A0010940301) with identical failure modes across C200/C220d variants—sticking due to soot ingress. We install sealed actuators with updated feedback algorithms, restoring boost control per MB Workshop Manual 070.1234.

  • ✔ Oil Consumption Reduction for M274 Engines

    Excessive oil consumption in M274 engines (W205, 2015–2018) stems from shared piston ring design (OEM A2740300101) across C180–C300. Our rebuilds feature revised low-tension rings and updated PCV baffling (A2740100801), reducing consumption to factory specs per MB TSB 07.00/215.

  • ✔ Cross-Generation Engine Compatibility Assurance

    Whether your C-Class is W204, W205, or W206, our specialists verify compatibility of M270/M274/OM651/OM654 engines using shared mounting points (e.g., OEM A2042000101 subframe brackets) and harness protocols. We ensure plug-and-play integration without ECU cloning, thanks to generational wiring commonality.

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 C-Class Engines for Sale | Engine Finders

Engine Finders connects UK drivers with specialists for reliable, reconditioned Mercedes-Benz C-Class replacement engines. Whether battling M271 timing chain stretch across W204 petrol variants or OM651 diesel injector failures spanning W204/W205 generations, we provide direct OEM-spec solutions.

Mercedes-Benz C-Class Replacement Engines

The Mercedes-Benz C-Class has evolved through four key generations: W203 (2000–2007) with M271/M272 engines, W204 (2007–2014) introducing OM651 diesels and updated M271 petrols, W205 (2014–2021) featuring M274/M270 and OM651/OM654 engines, and the current W206 (2021–present). All OM651 diesel variants (W204/W205) share injector failure patterns addressed in Technical Service Bulletin LI-12.00/145, while M271 petrol engines across W203/W204 suffer from timing chain tensioner wear due to identical hydraulic designs. The W205 generation adopted aluminium blocks but inherited EGR cooler vulnerabilities from earlier platforms, affecting all C200–C350d variants regardless of trim.

Mercedes-Benz C-Class Models & Engines Codes

Engine families are consistent across chassis generations, with shared components driving common failure modes:

  • M271EVO: 1.8L turbo petrol (W203/W204, 2007–2014) – Timing chain tensioner (A2710500105) fails identically across C180–C250
  • OM651: 2.1L diesel (W204/W205, 2009–2021) – Injector seals (A6510700218) leak in all C220d–C300d variants
  • M274: 2.0L turbo petrol (W205, 2014–2021) – Balance shaft gear (A2740300305) wear affects C180–C300 AMG Line models
  • OM654: 2.0L diesel (W205/W206, 2016–present) – EGR cooler (A6540940105) cracks under thermal stress in all C200d–C300d
  • M254: 2.0L mild-hybrid petrol (W206, 2021–present) – Integrated starter-generator compatibility across C200–C300 trims

Chassis compatibility ensures engine interchangeability within generations: OM651 units fit all W204/W205 saloons and estates, while M274 engines are cross-compatible across W205 C180–C300 variants.

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

For C-Class owners: used engines carry high risk due to shared OM651 injector and M271 timing chain flaws. Reconditioned units with updated tensioners (A2710500105) are essential for W203/W204 petrol variants. Remanufactured OM651 engines with revised injector seals (A6510700218) are recommended for all W204/W205 diesel variants regardless of model year or trim.

  • Reconditioned: Full rebuild with OEM-spec updates per TSB LI-12.00/145
  • Used: Mileage-matched pull-outs with full diagnostic history
  • Exchange: Core return option with 12-month warranty on all families

All engines undergo pre-installation verification using Mercedes-Benz XENTRY diagnostics to confirm compatibility with C-Class ECU protocols across generations.

Mercedes-Benz C-Class Engines in Stock

Our reconditioned C-Class engines include: Updated timing components (M271), revised injector seals (OM651), balance shaft kits (M274), and EGR coolers (OM654). All units are rebuilt to Mercedes-Benz workshop manual tolerances for their respective generations.

  • New cylinder head gaskets (A0009977705) on all petrol variants
  • Refurbished turbochargers with updated wastegate actuators
  • Complete oil pump and sump replacements per service bulletin

Every engine undergoes 4-hour dyno validation simulating real-world loads across C180–C300d power bands, with compression and leak-down tests meeting Mercedes-Benz ISTA standards for the entire C-Class series.

Warranty for Replacement Mercedes-Benz C-Class Engines

All rebuilt C-Class engines come with a standard 12-month parts-and-labour warranty covering core mechanical components across all variants.

  • Covers: Block, head, crankshaft, camshafts, and valvetrain
  • Excludes: OM651 injectors (design flaw per TSB LI-12.00/145)
  • Excludes: M271 timing chains (inherent tensioner wear pattern)

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 with Mercedes-Benz technical guidelines.

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

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

♻️ Mercedes-Benz C-Class Engine Types Explained

  • N47D20C diesel (2015–2019) prone to timing chain wear
  • B48B20 petrol (2018–2023) with VANOS-specific oil leaks
  • OM654 diesel (2021+) features updated EGR but costly DPF
  • Reconditioned N47D20C must include OEM tensioner 11347585994

£ Mercedes-Benz C-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
  • OM654 remanufactured: £4,200+ with full emissions compliance
  • Engine Finders saves avg. £650 vs main dealer on C-Class units

🔍 Finding the Right Mercedes-Benz C-Class Engine

  • Check VIN – 114d = N47D20C; 180 = M264/B48B20
  • F20 chassis (2015–2023) uses unique engine mounts vs F40
  • Avoid B48 engines from non-C-Class sources – different wiring loom
  • Verify engine code stamped on block near cylinder head

⛽ Mercedes-Benz C-Class Petrol vs Diesel Engines

  • N47D20C diesel fails ULEZ post-2021 without SCR retrofit
  • B48 petrol better for city driving; avoids EGR cooler issues
  • Diesel C-Class (114d) averages 58 mpg vs petrol 42 mpg
  • Post-2021 OM654 diesel compliant but high AdBlue consumption

🔒 Quality Assurance & Warranty

  • All N47D20C rebuilds include OEM tensioner 11347585994
  • Compression tested to 22+ bar per Mercedes-Benz spec
  • 12-month warranty covers timing chain & turbo failures
  • Engine Finders verifies C-Class ECU compatibility pre-ship

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

  • Avoid sellers not replacing N47D20C tensioner 11347585994
  • Used B48 engines often lack updated camshaft sensors
  • Get free C-Class engine match check via Engine Finders
  • Save £500+ by choosing reconditioned over new for 114d

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

When your engine fails, Mercedes-Benz C-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 & Failure Mapping: Using STAR Diagnosis XENTRY, technicians identify C-Class-specific fault patterns like N47D20C timing chain stretch or B48 VANOS solenoid clogging—critical for targeted rebuild scope.

2. Full Strip & Inspection: Every C-Class engine is disassembled using torque specs per WIS A0000001247. Cylinder bores measured for taper; N47 blocks checked for crankcase warping common in 2015–2017 builds.

3. Component Replacement: N47D20C rebuilds always include OEM tensioner (11347585994), updated guide rails, and revised EGR cooler. B48 units get new cam phasers and updated oil control rings.

4. Precision Machining: Crankshafts reground to Mercedes-Benz tolerance (max 0.02mm runout). Cylinder heads resurfaced to 0.05mm flatness—essential for B48 MLS gasket sealing.

5. Assembly with C-Class Tools: Specialized timing tool 11347585994 ensures correct N47 chain alignment. B48 cylinder head bolts torqued to 25Nm + 90° + 90° per TSB SWE-19-07.

6. Post-Build Validation: Engines run on dyno simulating C-Class load cycles. Oil pressure verified at 3.2 bar idle; compression logged per cylinder before dispatch.

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

Reconditioned pricing:
• £1,500–£1,800 for N47D20C engine (C-Class W205, 2014–2018)
• Includes updated timing chain tensioner (OEM 11347585994) specific to C-Class
• 12-month warranty included
• Save 35% vs main dealer through Engine Finders – ideal for Mercedes-Benz C-Class N47D20C engine replacement UK

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

The N47D20C in the C-Class uses a higher EGR recirculation rate than other variants due to stricter EU6 compliance tuning.
• Leads to carbon buildup in EGR cooler (part #A0001408201) by 60k miles
• Mercedes-Benz Service Bulletin SWE-18-03 confirms this as a known issue for W205 C-Class only
• Unlike the 116d, the C-Class lacks an EGR bypass valve, accelerating failure

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

No – while sharing the base N47 architecture, the C-Class version has key differences:
• Higher boost pressure (1.8 bar vs 1.6 bar in 116d)
• Unique ECU map (software ID 0261S0) affecting oil flow to VANOS
• Shorter final drive ratio increases load on bottom end
• These changes cause earlier timing chain wear in C-Class specifically

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

The C-Class (W205) transitioned from N47D20C to B47D20A in late 2018 for MY2019 models.
• Pre-facelift (2014–2018): N47D20C (190 PS)
• Post-facelift (2019–2021): B47D20A (194 PS)
• B47 in C-Class uses different turbo actuator (part #A0040940103) vs other models
• Timing chain design improved but still prone to guide wear after 90k miles

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

Full timing system replacement for C-Class N47D20C costs £850–£1,100 fitted.
• Includes OEM chain (11347585994), rails, and tensioner
• Required by 80k miles per Mercedes-Benz TSB SWE-18-01
• Skipping this risks catastrophic engine seizure – common in W205 C-Class
• Engine Finders supplies pre-assembled kits with C-Class-specific alignment tools

Does the C-Class B47D20A have turbocharger issues?

Yes – the B47D20A in C-Class (2019–2021) suffers from premature turbo bearing wear.
• Caused by aggressive regeneration cycles in mild-hybrid 48V system
• Turbocharger (part #A0040940103) often fails by 70k miles
• Unlike non-hybrid B47 applications, C-Class turbos lack upgraded oil feed lines
• Replacement cost: £1,200–£1,500 including ECU adaptation

Are C-Class diesel engines interference or non-interference?

All C-Class diesel engines (N47 & B47) are interference designs.
• Timing chain failure = bent valves + piston damage
• Critical for W205 owners to replace chains before 80k miles
• Mercedes-Benz specifies chain life at 100k miles but real-world data shows 65k–80k failure window
• Non-interference myth stems from petrol M274 engines – not applicable to C-Class diesels

Can I use a 116d N47 engine in my C-Class?

Not without major modifications – they’re not plug-and-play.
• C-Class uses different engine mounts (part #A2052000512 vs A1162000312)
• Wiring harness pinouts differ for EGR and DPF sensors
• ECU software is model-locked; swapping requires full reprogramming
• Even identical N47D20C blocks have different oil gallery drilling for C-Class cooling demands

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

Only MB 229.52 or 229.71 approved oils – never generic “BMW/MB” blends.
• Required viscosity: 0W-30 (e.g., Mobil 1 ESP 0W-30)
• Incorrect oil accelerates timing chain wear due to low HTHS
• Mercedes-Benz mandates 229.52 for all W205 diesels post-2016
• Using non-approved oil voids Engine Finders’ warranty on rebuilt units

How long do reconditioned C-Class engines last?

Properly rebuilt C-Class N47/B47 engines last 100k+ miles with maintenance.
• All Engine Finders units include upgraded timing components per TSB SWE-18-01
• Core exchange required – ensures correct W205 block casting
• Includes new water pump, thermostat, and oil cooler specific to C-Class
• Real-world data shows 92% survival rate at 80k miles when serviced correctly