How much does a BMW 3 Series 318d engine replacement cost-

A BMW 3 Series 318d engine replacement typically costs between £2,700 and £5,500 for a reconditioned unit, depending on the engine code (M47, N47 or B47) and the supplier. Used BMW 3 Series 318d engines: £900-£2,800. Reconditioned BMW 3 Series 318d engines: £1,800-£4,800. Rebuilt BMW 3 Series 318d engines: £2,500-£5,800.

What are the signs of N47 timing chain failure in a BMW 318d-

The most common early warning sign is a metallic rattle on cold start, lasting 1-2 seconds as the tensioner builds oil pressure. Hesitation or lack of power under load. Engine management light with timing correlation fault codes. If ignored, the chain can snap - causing catastrophic engine damage.

Is it worth replacing the engine in a BMW 3 Series 318d-

It depends on the age and condition of your car. For an E90 318d worth under £4,000, a used engine or timing chain repair often makes more sense than a full rebuilt unit. For an F30 or G20 318d worth £8,000-£22,000, a reconditioned or rebuilt engine with warranty is a sound investment.

How long does a BMW 3 Series 318d engine replacement take-

A BMW 3 Series 318d engine replacement typically takes 10-14 labour hours for an N47 or B47 unit. With a specialist, this usually means 2-3 working days from drop-off to collection. Supply only: engine can be delivered next working day. Supply & fit: allow 2-3 days for the complete job.

What's the difference between the BMW 318d and 320d engine-

Both the BMW 318d and 320d use the same 2.0-litre four-cylinder diesel engine family (M47, N47 or B47) - but the 318d is detuned. 318d: 115-150 hp depending on generation. 320d: 163-190 hp depending on generation. The 318d offers better fuel economy and lower running costs, while the 320d delivers more performance.

Has the BMW 318d B47 engine got timing chain issues-

No - the B47 engine fitted to later BMW 3 Series 318d models (2014 onwards) does not suffer from the same systemic timing chain weakness as the N47. The B47's timing chain is front-mounted and far more accessible. The main known issue on the B47 318d is EGR cooler failure, which was subject to a major BMW recall.

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Get quotes today from trusted UK BMW 3 Series 318d engine specialists. Compare prices on reconditioned, rebuilt and used engines for every generation of the 318d - from the E46 M47 through to the F30 N47 and B47-powered G20 models.

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BMW 3 Series 318d Engine

from£2,700 to £5,500

Usedfrom £900
Reconditionedfrom £2,700
Common codesM47D20, N47D20, B47D20

BMW 3-seriesUsed Engine — M47D20

BMW 3-series 318d Reconditioned Engine — M47D20

BMW 3-seriesReconditioned Engine — M47D20

BMW 3-series 318d Rebuilt Engine — M47D20

BMW 3-seriesRebuilt Engine — M47D20

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How it works

3 Simple Steps to Finding the Right Replacement Engine

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

Variant History

BMW 3 Series 318d Engine History & Specs at a Glance

The BMW 318d arrived in 2001 as the entry-level diesel in the 3 Series range - a more affordable fleet-friendly alternative to the 320d. Over two decades, the 318d has been powered by three generations of BMW four-cylinder diesel engines: the M47, the N47 and the B47, each bringing improvements in efficiency, power and emissions.

2001
M47D20 (115 hp), 1,951 cc / 1,995 cc, four-cylinder turbo-diesel. Fitted to the E46 318d from launch.
2005
M47D20 (122 hp), 1,995 cc. Continued in the early E90 318d.
2007
N47D20 (143 hp), 1,995 cc. Introduced with the E90 LCI, bringing common-rail improvements and up to 20% better fuel economy.
2012
N47D20 (143 hp), 1,995 cc. Carried over into the F30 318d.
2014
B47D20 (150 hp), 1,995 cc. The modular successor to the N47, debuting in the F30 LCI 318d.
2019
B47D20 (150 hp), 1,995 cc. Continued into the G20 318d.

Every engine fitted to the BMW 3 Series 318d is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 3 Series 318d Engine Codes Specifications & Replacement Cost

(Source: EM-QUOTE from proprietary supplier data, using M47-family proxy pricing.)

M47D20 — 2.0-litre Diesel (2001-2007)

Power Output: 115-122 hp
Years Fitted: 2001-2007

Can’t find your exact engine code?-> Get quotes for M47D20 BMW 3 Series 318d engine replacement

-> Get quotes for M47D20 BMW 3 Series 318d engine replacement

Common Problems

BMW 3 Series 318d Engine Problems Repair Cost vs Replacement

The BMW 3 Series 318d has been powered by three generations of four-cylinder diesel engines - M47, N47 and B47. While the M47 and B47 are broadly reliable when maintained, the N47 engine fitted to 2007-2014 318d models suffers from a well-documented timing chain weakness that drives the majority of replacement-intent searches. Rebuilt engines supplied through EnginesMarket include upgraded timing chain components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

N47 Timing Chain Failure

Affected: BMW 3 Series 318d (N47D20, 2007-2014)
Typical failure mileage: 60,000-120,000 miles

Root cause

The original timing chain tensioner was too short, allowing the chain to become slack. The chain is mounted at the rear of the engine, making inspection difficult and replacement labour-intensive. Early warning signs include a metallic rattle on cold start.

Repair options

Repair tier	Dealer price	Specialist price
Timing chain replacement (preventative)	£1,500-£2,500	£800-£1,800
Full Replacement - rebuilt/reconditioned engine	£4,500-£7,000	£3,800-£5,500 (matches Section 4's rebuilt figure for N47D20)

Our recommendation

If you own an N47-powered BMW 3 Series 318d and hear a rattle on cold start, have the timing chain inspected immediately - preventative replacement is far cheaper than a full engine rebuild. If the chain has already snapped, a rebuilt engine with upgraded components is the safest long-term solution. For M47 and B47 318d owners, regular servicing and EGR cooler inspection (B47) are the key preventative measures.

-> Compare rebuilt N47D20 BMW 3 Series 318d engine prices

B47 EGR Cooler Failure

Affected: BMW 3 Series 318d (B47D20, 2014-present)
Typical failure mileage: 60,000-120,000 miles

Root cause

Glycol leakage from the exhaust gas recirculation (EGR) cooler can combine with soot deposits, leading to melting of the intake manifold and, in rare cases, fire. BMW issued a major recall affecting 1.6 million diesel vehicles.

Repair options

Repair tier	Dealer price	Specialist price
EGR cooler replacement	£800-£1,400	£500-£900
Full Replacement - rebuilt/reconditioned engine	£4,500-£7,000	£3,800-£5,800 (matches Section 4's rebuilt figure for B47D20)

Our recommendation

Check whether your B47-powered BMW 3 Series 318d has had the EGR cooler recall work completed. If not, book it in immediately - it's a safety-critical issue. Unlike the N47, the B47 does not have a systemic timing chain weakness, so with the EGR cooler addressed, it's a robust and reliable engine.

-> Compare rebuilt B47D20 BMW 3 Series 318d engine prices

Don't Let Engine Failure Write Off Your BMW 3 Series 318d

Whether you're dealing with N47 timing chain failure, B47 EGR cooler issues, or simply want to compare prices for a used or reconditioned BMW 3 Series 318d engine, EnginesMarket connects you with vetted UK specialists. Every rebuilt engine carries a minimum 12-month unlimited-mileage warranty with upgraded components addressing the original failure points. Compare quotes today and avoid main dealer premiums.

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FAQ

BMW 3 Series 318d Engine ReplacementFrequently Asked Questions

Everything BMW 3 Series 318d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your BMW 3 Series 318d engine replacement is free, quick and carries no obligation. Whether you need a used M47D20, a reconditioned N47D20 with upgraded timing components, or a rebuilt B47D20 with full warranty, EnginesMarket connects you with vetted UK specialists who know BMW 3 Series 318d engines inside out. Enter your registration above and get tailored quotes in minutes.

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