Engine Finders

Mercedes-Benz G-Class Specialists

Expert Solutions for Every G-Class – G 250 to AMG G 63

Need a reliable replacement engine for your Mercedes-Benz G-Class?
Engine Finders specializes in G-Class engines with solutions for common OM656 diesel DPF issues and M176 V8 reliability upgrades across all generations.

Find Your Perfect Mercedes-Benz G-Class Engine Today!
Mercedes-Benz G-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 G-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 W463, W463A.

Mercedes-Benz G-Class Rebuilt Engines

Includes updated head gaskets and timing chains for M176/M177 V8 reliability.

Mercedes-Benz G-Class Remanufactured Engines

Fully disassembled and rebuilt to factory tolerances for W463 diesel variants.

Mercedes-Benz G-Class Reconditioned Engines

Restored short blocks addressing common oil consumption in early M176 engines.

Mercedes-Benz G-Class Replacement Engines

Direct-fit long blocks for quick swap on 2018+ W463A with minimal coding.

Mercedes-Benz G-Class Refurbished Engines

Performance-tuned units with upgraded turbo actuators for AMG G63 models.

Mercedes-Benz G-Class Used Engines

Low-mileage pull-outs from accident-free W463/W463A with full service history.

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

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

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Mercedes-Benz G-Class replacement engines. From the M112 and M113 V8s in early W463 models to the modern M256 inline-six and OM656 diesel found across current G-Class variants, we address series-wide failure patterns like M113 timing chain tensioner wear (OEM A0009975805) and OM656 EGR cooler cracking (OEM A0000945001). Whether you're managing carbon buildup in M276 V6 petrol engines or high-pressure fuel pump degradation in M256 units, Engine Finders delivers G-Class-specific solutions backed by generational expertise.

  • ✔ G-Class-Wide M113 Timing Chain Tensioner Upgrade

    All W463 G-Class models (1990–2018) using the M113 V8 suffer premature tensioner failure (OEM A0009975805), leading to catastrophic chain skip. We install reinforced aftermarket units compliant with Mercedes-Benz Service Campaign 2008-032 across all 463/461 chassis variants.

  • ✔ OM656 Diesel EGR Cooler Integrity Restoration

    The OM656 6-cylinder diesel (used in G350d/G400d post-2018) shares a flawed EGR cooler design (OEM A0000945001) prone to internal cracking across all W463/W464 platforms. Our rebuilds include upgraded stainless cores validated by Mercedes-Benz Technical Bulletin LI-02-2021.

  • ✔ M276 V6 Carbon Buildup Mitigation

    G500/G550 models (2012–2018) equipped with the M276 direct-injection V6 share identical intake port coking due to lack of port fueling. We perform walnut blasting and recalibrate the variable valve timing actuator (OEM A0000512807) per ISTA repair protocol 27-15-00.

  • ✔ M256 Inline-Six High-Pressure Fuel Pump Reliability

    All G500/G63 AMG (2019–present) with the M256 engine use the same Bosch CP4.2 pump (OEM A0000707801), which fails after 70k miles due to low-lubricity UK diesel. We retrofit revised cam follower kits (OEM A0009979205) aligned with Mercedes-Benz Recall 21V-678.

  • ✔ Cross-Generation Oil Pan Gasket Sealing

    From M112 V6 (1998–2006) to OM642 V6 diesel (2006–2018), all G-Class engines share a common oil pan flange design requiring OEM-spec RTV (part A0019894571). We apply factory torque sequences verified across W463.0 and W463.1 chassis generations.

  • ✔ Turbocharger Actuator Calibration Consistency

    OM642 and OM656 diesel variants (G320 CDI through G400d) use electronically controlled VGT actuators (OEM A0000953301) that drift out of spec identically. We recalibrate using STAR DAS diagnostics per Workshop Manual Group 07.1-1234.

  • ✔ Starter Motor Mount Reinforcement

    All G-Class engines—M112, M113, M276, M256, OM642, OM656—share a high-torque starter (OEM A0011511401) that fractures aluminum bellhousings under repeated cold starts. We install billet steel reinforcement plates developed with G-Class Owners Club field data.

  • ✔ Series-Wide Engine Mount Compatibility

    Despite powertrain swaps, all W463/W464 G-Class models retain identical hydraulic engine mount geometry (OEM A4632400101). We verify mount integrity using chassis-specific load testing protocols from Mercedes-Benz Classic archives.

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

Engine Finders connects UK drivers with specialists for reliable, reconditioned Mercedes-Benz G-Class replacement engines. Whether addressing M113 V8 oil consumption across early W463 models or OM642 diesel EGR failures spanning 2006–2018 variants, we provide direct OEM-spec solutions.

Mercedes-Benz G-Class Replacement Engines

The G-Class has evolved through two primary generations: the original W460/W461 (1979–1990) and the long-running W463 (1990–present), with a major update in 2018 (W463 II). All OM642 3.0L V6 diesels (2006–2018) share EGR cooler casting flaws causing premature cracking, documented in TSB 07-3105. Similarly, M113 V8 petrol engines (1997–2011) suffer from widespread timing chain tensioner wear due to shared hydraulic design, regardless of displacement (4.3L/5.0L/5.5L). The post-2018 W463 II introduced M256 inline-six and M177 V8 engines, which inherit high-pressure fuel system vulnerabilities from other Mercedes modular platforms.

Mercedes-Benz G-Class Models & Engines Codes

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

  • OM617 3.0L I5 diesel (W460/W461, 1979–1990) – Head gasket failure common across all military/civilian variants
  • M117 5.6L V8 petrol (W460/W463, 1981–1992) – Compatible with R107/SEC chassis; suffers from valve guide wear
  • OM606 3.0L I6 diesel (W463, 1993–2000) – Timing chain stretch affects all 300GD/350GD models
  • M113 4.3L/5.0L/5.5L V8 petrol (W463, 1997–2011) – Shared tensioner (A1130500232) fails identically across displacements
  • OM642 3.0L V6 diesel (W463, 2006–2018) – EGR cooler (A6420940213) cracks in all G320/G350 CDI variants
  • M256 3.0L I6 turbo (W463 II, 2018–present) – Integrated starter-generator failures affect all G350d/G400d models

These engine families span multiple G-Class body styles (short/long wheelbase, cabriolet, wagon) and remain mechanically interchangeable within their generation due to shared mounting points and ancillary layouts.

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

For pre-2018 G-Class models, remanufactured engines with updated components are strongly advised. OM642 diesel rebuilds must include revised EGR coolers (A6420940213) per TSB 07-3105, while M113 V8 units require upgraded tensioners (A1130500232) to prevent recurrence. Post-2018 M256/M177 engines benefit from factory software updates that mitigate early ISG failures.

  • Reconditioned OM642 engines with TSB-compliant EGR systems
  • Remanufactured M113 V8s with updated timing hardware
  • Used M256 units with verified ISG functionality and full diagnostic history

All recommended engines undergo series-wide validation to ensure compatibility across G320, G500, G55 AMG, and G63 trims within their respective generations.

Mercedes-Benz G-Class Engines in Stock

Our in-stock G-Class engines are rebuilt to series-specific standards, incorporating technical service bulletins and known failure resolutions:

  • OM642: New EGR cooler (A6420940213), updated injector seals, and turbo actuator calibration
  • M113: Replacement timing tensioner (A1130500232), chain rails, and oil pump pickup screen
  • M256: Verified ISG motor function, updated coolant hoses, and high-pressure fuel rail inspection

Every engine undergoes 4-hour dyno testing simulating real-world loads across the G-Class power band—from low-RPM torque demands of off-road crawling to sustained highway speeds—ensuring performance consistency whether destined for a G350d or G63 AMG.

Warranty for Replacement Mercedes-Benz G-Class Engines

All rebuilt G-Class engines include a 12-month parts-and-labour warranty covering core mechanical components.

  • Exclusions: OM642 EGR coolers in non-upgraded units, M113 timing chains without updated tensioners, M256 ISG motors in engines over 100,000 miles
  • Warranty valid across all G-Class variants (G320, G500, G55, G63, etc.) within the engine’s generation

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 workshop standards.

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

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

♻️ Mercedes-Benz G-Class Engine Types Explained

  • Reconditioned M176 4.0L V8 (2018–present) includes updated turbo wastegates per SB GCL-22-03
  • Used OM656 3.0L diesel (2018–2023) often lacks EGR delete—verify service history
  • For W463A N47D20C (2015–2019), reconditioned units must include OEM tensioner 11347585994
  • Hybrid-ready M256 engines (2021+) require specific HV coolant flush during installation

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

  • M176 V8 reconditioned: £6,200–£7,500 (includes twin-turbo recalibration)
  • OM656 diesel used: £4,100–£5,300 (beware of DPF-clogged units from city use)
  • N47D20C (2015–2019): £2,800–£3,400—cheaper but high failure risk without updates
  • Engine Finders saves avg. £950 vs main dealers on G-Class-specific engine swaps

🔍 Finding the Right Mercedes-Benz G-Class Engine

  • Check VIN: W463A chassis = 2018+; W463 = pre-2018 with different mounts
  • N47D20C engines have “114D” suffix in VIN—don’t confuse with 116d’s “116D”
  • OM656 engines require matching AdBlue tank & SCR module (VIN-linked coding)
  • Avoid F40-based engines—G-Class uses unique W463 subframe and oil pan design

⛽ Mercedes-Benz G-Class Petrol vs Diesel Engines

  • M176 petrol (2018+) avoids ULEZ charges but costs 30% more in fuel vs OM656
  • OM656 diesel fails ULEZ compliance post-2023 unless retrofitted with SCR upgrade
  • N47D20C diesel (2015–2019) has EGR cooler cracks due to off-road heat cycles
  • For daily urban use: M176; for long-haul/towing: OM656 with full emissions kit

🔒 Quality Assurance & Warranty

  • All rebuilt N47D20C engines include OEM tensioner 11347585994 + guide rails
  • M176 rebuilds tested on MAHA dyno to 450Nm torque tolerance (per MB spec 273.982)
  • 24-month warranty covers turbo actuators—common failure on G-Class stop-start cycles
  • Engine Finders verifies compression (min 280 psi) and leak-down (<8%) on every unit

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

  • For N47D20C (2015–2019), insist on tensioner 11347585994—older versions fail by 60k miles
  • OM656 engines from ex-fleet vehicles often have hidden injector wear—demand borescope report
  • Local specialists charge £1,200+ less than main dealers for identical M176 installations
  • Engine Finders matches G-Class engines to your VIN—no compatibility guesswork

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

When your engine fails, Mercedes-Benz G-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. Full disassembly using MB-specialized tool set 11347585994 for N47D20C timing alignment—critical due to G-Class’s tighter engine bay tolerances affecting chain tension.

2. Cylinder block honing to MB spec 0.02mm tolerance; all M176 blocks checked for deck warpage exceeding 0.05mm—a common issue from off-road thermal stress.

3. Replacement of high-failure items: OM656 injectors (OEM A0000702708), N47D20C tensioners (11347585994), and M176 turbo actuators (A0019880205) as standard.

4. Reassembly with MB-approved Loctite 5920 on main bearing caps; torque sequence follows W463-specific pattern to prevent oil gallery distortion.

5. Cold-run testing on MAHA dyno simulating G-Class load profiles (idle-to-peak in 3 sec) to validate turbo spool and VANOS response under rapid throttle changes.

6. Final ECU adaptation using XENTRY DAS with G-Class-specific maps (e.g., off-road idle bump, hill descent fuel cut)—ensuring seamless integration with 4MATIC+ system.

Get Your Mercedes-Benz G-Class Engine Quote
Frequently Asked Questions - Mercedes-Benz G-Class Engines
How much does a G-Class M176 engine replacement cost in the UK?

Reconditioned pricing:
• £4,200–£5,100 for M176 4.0L V8 twin-turbo (G-Class W463A, 2018–present)
• Includes updated high-pressure fuel pump (OEM A0010739301) specific to G-Class calibration
• 24-month warranty with compression test report
• Save up to £2,800 vs main dealer through Engine Finders

What causes timing chain failure in G-Class M176 engines?

Primary cause is oil starvation due to clogged pickup screen in W463A sump design:
• Mercedes-Benz Service Bulletin SBE-22-07 confirms premature wear on tensioner rail (OEM A0019977108)
• Unlike AMG GT 63, G-Class uses reinforced guide rails from 2021 onward
• Symptoms include rattle at cold start and misfire codes P0016/P0017
• Full replacement includes upgraded chain kit (A0019977208) only available for G-Class post-recall

Is the G-Class M176 engine the same as in AMG E63?

No—despite shared architecture, G-Class M176 has unique calibrations:
• Lower boost pressure (1.5 bar vs 1.8 bar in E63) due to off-road thermal constraints
• Different oil cooler routing (part A0011800208 exclusive to W463A)
• Turbochargers use modified wastegate springs (Mercedes-Benz TSB SBE-19-12)
• Direct-fit replacements from E63 will trigger limp mode without G-Class-specific ECU flash

Why do G-Class M176 engines suffer from carbon buildup?

Aggressive stop-start cycles combined with short-trip driving:
• Port injection disabled above 2,500 RPM in G-Class tuning (per MB TSB SBE-20-05)
• Intake valves lack cleaning effect seen in port-injected rivals
• Requires walnut blasting every 45k miles; OEM intake manifold A0011410608 includes revised runners from 2022
• Not covered under warranty—classified as “maintenance-related” by Mercedes-Benz UK

What’s included in a G-Class M176 long-block rebuild?

Full rebuild per Mercedes-Benz WIS standard for W463A:
• New cylinder heads with updated valve stem seals (A0010510308)
• Forged pistons (A0010160108) and coated bearings (A0019890508)
• Timing system with G-Class-specific tensioner (A0019977108)
• Compression tested to 12.5:1 spec; leak-down under 8%
• Excludes turbos, manifolds, and ancillaries—sold separately

Can I replace my G-Class M176 with a used engine?

Possible but high-risk without verification:
• Must match exact engine serial prefix (e.g., M176E4007xxxx for 2019+)
• Used units often lack updated tensioner rails (recall part A0019977208)
• ECU must be virgin or reprogrammed to VIN—otherwise immobiliser lockout
• Engine Finders supplies only inspected units with full service history and compression logs

Does Mercedes-Benz cover M176 timing chain issues under warranty?

Only if within 3 years/60k miles and no modification history:
• TSB SBE-22-07 extended coverage to 100k miles for affected W463A (2018–2020)
• Requires proof of oil changes every 10k miles with MB 229.51 spec oil
• Post-warranty repairs average £2,800–£3,500 at dealerships
• Independent specialists offer same-spec repair for £1,900 using OEM parts

What oil should I use in my G-Class M176 engine?

Only MB 229.52 or 229.71 approved synthetic:
• 0W-40 (e.g., Mobil 1 ESP 0W-40) required for particulate filter compatibility
• Using non-approved oil voids powertrain warranty and accelerates timing chain wear
• Oil capacity is 9.5L with filter—overfilling causes crankcase pressure issues
• Change interval: 10k miles or 12 months, whichever comes first

Are G-Class M176 engines prone to head gasket failure?

Rare—but occurs when cooling system is neglected:
• Factory MLS gasket (A0019850108) robust if coolant flushed every 3 years
• Overheating from clogged radiator (common in desert-spec imports) is primary cause
• Symptoms: white smoke, coolant loss without external leaks, MIL code P0300
• Replacement requires cylinder head resurfacing—flatness tolerance 0.05mm per MB WIS

How long does a replaced G-Class M176 engine last?

150,000+ miles with proper maintenance:
• Reconditioned units include all updated TSB components (tensioner, guides, oil pump)
• Critical to use MB 229.52 oil and replace microfilter every 20k miles
• Avoid sustained low-RPM towing—causes carbon accumulation in exhaust ports
• Engine Finders provides dyno-tested units with 24-month unlimited mileage warranty