Engines Market

Mercedes ML 270 CDI/320 CDI SPECIALISTS

Mercedes Benz M Class 270 CDI/320 CDI Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz M Class 270 CDI and 320 CDI engine specialists. Compare prices on reconditioned, rebuilt and used engines for the 2.7-litre inline-five and the 3.2-litre inline-six diesels - supply & fit available nationwide.

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Mercedes Benz M Class 270 CDI/320 CDI Engine
from£1,800 to £3,000
  • Usedfrom £1,000
  • Reconditionedfrom £1,800
  • Common codesOM647, OM648
Mercedes Benz m-class 270 CDI/320 CDI Used Engine — OM647.961Mercedes Benz m-classUsed Engine — OM647.961Mercedes Benz m-class 270 CDI/320 CDI Reconditioned Engine — OM647.961Mercedes Benz m-classReconditioned Engine — OM647.961Mercedes Benz m-class 270 CDI/320 CDI Rebuilt Engine — OM647.961Mercedes Benz m-classRebuilt Engine — OM647.961

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3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz M Class 270 CDI/320 CDI Engine History & Specs at a Glance

The ML 270 CDI launched with the W163 generation in 1999 as Mercedes' first premium SUV diesel, powered by the OM647 2.7-litre inline-five - a robust, turbocharged engine delivering 163hp. In 2002, the ML 320 CDI joined the range with the OM648 3.2-litre straight-six diesel, offering a smoother, more powerful 224hp and representing the pinnacle of W163 diesel refinement before the W164 generation introduced V6 architecture.

Mercedes Benz M Class 270 CDI/320 CDI
  1. 1999

    OM647.961, 2.7L inline-five diesel, 163hp @ 4,200rpm (ML 270 CDI, W163 launch)

  2. 2002

    OM648, 3.2L straight-six diesel, 204-224hp @ 4,200rpm (ML 320 CDI, W163)

  3. 2005

    End of W163 production; OM647 and OM648 replaced by OM642 V6 diesel in W164 generation

Every engine fitted to the Mercedes Benz M Class 270 CDI and 320 CDI is covered below, with UK rebuilt pricing and known failure points - from OM647 injector seal leaks to OM648 EGR cooler degradation.

Engine Codes & Pricing

Mercedes Benz M Class 270 CDI/320 CDI Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

OM647.961 — 2.7L Inline-Five Diesel (1999-2005) engine

OM647.961 — 2.7L Inline-Five Diesel (1999-2005)

Power Output
163 hp (120 kW) @ 4,200 rpm
Torque
400 Nm @ 1,800-2,600 rpm
Years Fitted
1999-2005
Displacement
2,685cc
Cylinders
Inline 5, 20-valve, DOHC, turbocharged and intercooled

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Common Problems

Mercedes Benz M Class 270 CDI/320 CDI Engine Problems Repair Cost vs Replacement

The M Class 270 CDI's OM647 inline-five and the 320 CDI's OM648 straight-six are among Mercedes' most durable diesel engines - robust, simple, and capable of 200,000+ miles with proper maintenance. However, both have well-documented weak points that become more pronounced with age and mileage. The OM647 is prone to injector copper seal leaks, while the OM648 can suffer from EGR clogging and oil cooler seal degradation. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing these original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

OM647 Injector Copper Seal Leak

Affected
Mercedes M Class ML 270 CDI (OM647.961, 1999-2005)
Typical failure mileage
80,000-150,000 miles
Root cause
The copper sealing washers under the injectors can fail over time, allowing combustion gases to escape past the injector body. The leaking gases bake into a hard, tar-like carbon crust around the injector - known as "Black Death." This creates diesel fumes in the cabin and a messy engine bay.

Repair options

Repair tierDealer priceSpecialist price
Minor - Injector seal replacement (one)£200-£400£120-£250
Intermediate - Injector seal replacement (all five)£600-£1,000£400-£700
Major - Injector extraction + head repair£1,500-£2,500£900-£1,600
Full Replacement - Rebuilt OM647 engine£4,500-£6,000£2,000-£2,600
Our recommendation
Injector seal leaks on the OM647 are common but usually not urgent. If you notice diesel fumes in the cabin or see carbon buildup around the injectors, have a specialist inspect the seals immediately. Caught early, resealing an injector is a £120-£250 per cylinder job. Caught late, extracting a seized injector can require specialty pullers and head work. On an ML 270 CDI worth £3,000-£8,000, preventative injector seal replacement is always the better investment.
-> Compare rebuilt OM647 Mercedes M Class 270 CDI engine prices

OM648 EGR Valve Clogging & Rough Idle

Affected
Mercedes M Class ML 320 CDI (OM648, 2002-2005)
Typical failure mileage
60,000-100,000 miles
Root cause
The OM648's EGR valve can become clogged with carbon deposits, especially on vehicles used for short journeys or with extended service intervals. This causes rough idle, surging, and hesitation - a common complaint on these otherwise reliable engines.

Repair options

Repair tierDealer priceSpecialist price
Minor - EGR valve cleaning£200-£400£150-£300
Intermediate - EGR valve replacement£400-£700£250-£500
Full Replacement - Rebuilt OM648 engine£4,500-£6,500£2,200-£3,000
Our recommendation
EGR clogging on the OM648 is a maintenance issue, not a fundamental engine failure. If caught early, cleaning the EGR valve at a specialist is a cost-effective solution. If the valve requires replacement, specialist pricing of £250-£500 is significantly lower than dealer rates. Regular use of quality diesel and occasional Italian tune-ups can help prevent carbon buildup.
-> Compare rebuilt OM648 Mercedes M Class 320 CDI engine prices

OM647/OM648 Cold Start & Power Loss Issues

Affected
Mercedes M Class ML 270 CDI (OM647), ML 320 CDI (OM648), 1999-2005
Typical failure mileage
60,000-120,000 miles
Root cause
Cold start problems on both OM647 and OM648 engines can be caused by air ingress into the fuel system overnight, often from degraded seals or hoses. Loss of power or limp mode on the OM647 can also result from a defective 10A fuse for the engine control unit, triggering multiple fault codes.

Repair options

Repair tierDealer priceSpecialist price
Minor - Fuel system inspection & seal replacement£200-£400£150-£300
Minor - Fuse replacement & diagnostics£100-£200£80-£150
Full Replacement - Rebuilt OM647/OM648 engine£4,500-£6,500£2,000-£3,000
Our recommendation
Cold start problems on these classic diesels are often simple fixes - air in the fuel lines from degraded seals is a common culprit. For power loss issues, check the 10A fuse for the engine control unit before assuming major component failure. If the engine starts and runs but suffers from intermittent power loss, a simple fuse replacement may resolve the issue.
-> Compare OM647/OM648 Mercedes M Class engine quotes

Don't Let Injector Seal Leaks, EGR Clogging, or Electrical Issues Write Off Your Mercedes ML 270 CDI or 320 CDI

Whether you're facing OM647 injector seal leaks on your ML 270 CDI or OM648 EGR clogging on your ML 320 CDI, EnginesMarket makes it simple to compare quotes from trusted UK Mercedes diesel specialists. Every rebuilt engine in our network carries upgraded components addressing the original design weakness - new injector seals, updated EGR components, and bench-tested fuel systems - plus a minimum 12-month unlimited mileage warranty with nationwide delivery and supply & fit options. Don't pay main dealer premiums. Compare prices from independent Mercedes specialists who know these classic inline diesels inside out.

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FAQ

Mercedes Benz M Class 270 CDI/320 CDI Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz M Class 270 CDI/320 CDI owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes M Class 270 CDI/320 CDI Engine Prices Today

Comparing quotes for your Mercedes ML 270 CDI or 320 CDI is completely free, with no obligation and no pressure. Enter your registration above to get tailored quotes from UK Mercedes diesel specialists who understand the OM647 inline-five and OM648 straight-six inside out. Whether you need a used engine, a reconditioned unit, or a full rebuilt engine with upgraded injector seals and EGR components, we'll connect you with the right specialist for your exact M Class - with a minimum 12-month warranty on every engine supplied.

500+500+ inline diesel engines supplied through our network
12-Month12-Month Warranty on every rebuilt ML 270 CDI and 320 CDI engine
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