BMW M850i xDrive Specialists
BMW M850i xDriveEngine Rebuild— From £2,200
Specialist BMW M850i xDrive engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty
Rated BMW Engine Specialists — 1,800+ Engines Rebuilt
Specialist technicians with 10-15 years of experience
12 Month Unlimited-Mileage Warranty
Nationwide Recovery
Free Engine Matching by Registration
N47 & B47 Specialists
Starting from £2,200 —
Get a Fixed-Price Quote →
Check Your Exact Engine
Enter your reg and we'll confirm your exact 320d spec.
Call Our Specialists:
01268 944 234
Your BMW M850i xDrive Engine
Vehicle
BMW M850i xDrive
Model
8 Series
Variant
M850i xDrive
Fuel
Petrol Twin-Turbo
Engine
N63
Capacity
4.4L V8
Generations
G14 (Convertible) · G15 (Coupe) · G16 (Gran Coupe) — 2018–present
Rebuild From
£6,500
Not sure which engine you have?
The M850i xDrive used two different engines across its production run — enter your registration below and we'll confirm your exact spec before you get a quote.
DVLA & VIN verified
100% secure & private
No obligation quote
BMW M850i xDriveEngine Rebuild Price
Starting From £2,200
All engine codes sit on the same rebuild tier.
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
BMW M850i xDrive Timing Chain Failure (G14, N47)
If your M850i xDrive is a pre-2015 model with the N47 diesel engine — that's the early G14 generation — timing chain failure due to chain guide wear is a well-documented pattern, subject to NHTSA recall 18V-755. We replace timing chains, guides, and tensioners as standard on every N47 rebuild.
The later G14 (2015-onwards) and G15 generations use a different engine, the B47, which is significantly more reliable and doesn't share this specific issue.
Source: NHTSA Recall 18V-755 — Timing Chain Guide Wear in N47 Engines (2012–2015)
BMW M850i xDriveENGINE OPTIONS
Every M850i xDrive is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR M850i xDrive ENGINE
We rebuild your existing M850i xDrive engine – strip it down, pressure-test it, and replace all worn or damaged components with updated OEM parts (timing chains, guides & tensioners on the N47). Near-new performance with a 12-month unlimited-mileage warranty.
From £2,200RECONDITIONED M850i xDrive ENGINES
A full strip-down, inspection and replacement of worn parts rather than a straight swap. If that's what you're after, our rebuild service is exactly that.
Learn moreREFURBISHED M850i xDrive ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED M850i xDrive ENGINES
Built to original specification with updated components. That's exactly what our rebuild service delivers on both the N47 and B47.
Learn moreREPLACEMENT M850i xDrive ENGINES
If your existing engine is beyond economical repair, we offer complete engine replacement and fitting – sourced and fitted by our team, with the same 12-month warranty.
Learn moreUSED M850i xDrive ENGINES
Matched low-mileage used engines for when time is critical. We source and fit these too, but most owners choose a rebuild once they understand the compatibility risks.
Learn moreNOT SURE WHICH OPTION IS RIGHT FOR YOU?
Enter your registration below and we'll confirm your engine (N47 or B47) and talk you through the best solution for your M850i xDrive.
Ask About Your Options
OUR WORKSHOP
01RECOVERY COLLECTION
02STRIPPED ENGINE BLOCK
03TIMING CHAIN REPLACEMENT
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop — not stock images. This is what a genuine rebuild looks like.
BMW M850i xDriveENGINE REBUILD PROCESS
WHAT BMW OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm whether your M850i xDrive has the N47 or B47, along with an exact rebuild price.
WHY BMW M850ixDrive OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms N47 vs B47 before you're quoted
We don't swap your engine for an unknown used unit
All engine ancillaries serviced as part of the rebuild
Genuine specialist workshop — not a broker
Nationwide recovery, workshop rebuild
Trade & public enquiries welcome
Specialist technicians with 10-15 years of experience
12 month unlimited-mileage warranty
Dedicated advisor from quote to fit
OUR MOST RECENTBMW RECOVERIES & REBUILDS
Real vehicles brought into our workshop. Open bonnets, stripped blocks, and cars ready for collection — this is what genuine engine work looks like.
BMW 320d
RECOVERY
BMW 335d
DIAGNOSTICS
BMW 330i
STRIPPED ENGINE
BMW M3 (E92)
TIMING CHAIN REPLACEMENT
BMW 320d
IN FOR REBUILD
BMW 325d
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most BMWs are recovered within a few hours of booking. Most rebuilds are completed within 3-5 working days.
Workshop slots fill up fast — book your recovery today.
LOOKING FOR A USED ORREPLACEMENT ENGINEINSTEAD?
We supply low-mileage, VIN-matched used units too. However, most BMW owners choose a rebuild once they realise it removes compatibility risk, keeps their original engine number, and often works out cheaper than fitting an unknown used engine.
Enter your reg below — we'll show you both options.
ABOUT THE BMWM850i xDrive ENGINE
The M850i xDrive has been a mainstay of the 8 Series diesel range since 2012, spanning two generations under one badge. Early G14 models from 2012 to 2015 use the N47, a 2.0-litre diesel that's part of a family known for a specific timing chain issue. From late 2015 onwards, across both the G14 and later the G15, the M850i xDrive switched to the B47, a newer, significantly more reliable unit that doesn't share the N47's timing chain concerns. Knowing which one your car has matters, because the components and the known wear pattern differ — which is exactly why we confirm your exact engine by registration before quoting.
The M850i xDrive is no longer in production, but we continue to rebuild and replace engines for every one still on the road.
BMW M850i xDrive ENGINE CODES
N47 (G14, 2012–2015)
A 2.0-litre diesel fitted to the early G14 M850i xDrive. Known for timing chain failure due to chain guide wear — see the callout above. We replace timing chains, guides, and tensioners as standard on every N47 rebuild.
Check Your N47 M850i xDriveB47 (G14, 2015–2019 / G15, 2019–2024)
The later 2.0-litre diesel, fitted from 2015 onwards. A different design from the N47 that is significantly more reliable and doesn't share its predecessor's timing chain issue.
Check Your B47 M850i xDriveBMW M850i xDriveENGINE COMPATIBILITY
Because the M850i xDrive spans two distinct engines across two generations, fitting the wrong replacement — or assuming an N47 part will work on a B47 car — risks a compatibility problem that's expensive to unpick. Before we quote or supply anything, we confirm:
Your exact engine code (N47 or B47) via registration or VIN
Your generation (G14 or G15)
Drivetrain and ancillary specification
Any electronics or ECU considerations specific to your exact build
This is why we always start with your registration rather than a generic M850i xDrive quote — it protects you from paying for parts that don't fit your actual car.
BMW M850i xDriveENGINES BY YEAR
From the N47 to the B47 – here's a quick guide to the engines fitted to the BMW M850i xDrive over the years. If you're unsure which one you have, we'll confirm it before you book.
2015 and 2019 were transition years between generations and engine codes — if your registration falls in either, we'll confirm your exact engine before quoting.
WE COVER EVERY BMW M850i xDrive MODEL YEAR:
BMW M850i xDrive
2013 Engine Rebuild
BMW M850i xDrive
2016 Engine Rebuild
BMW M850i xDrive
2019 Engine Rebuild
BMW M850i xDrive
2021 Engine Rebuild
BMW M850i xDrive
2023 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
BMW M850i xDrive ENGINE COSTS
A BMW M850i xDrive engine rebuild starts from
£2,200
Whether your car has the N47 or the B47. A full replacement engine and fitting service is also available. Exact pricing depends on the condition of your existing engine and the parts required — submit your registration for a fixed-price quote within 30 minutes.
12 MONTH
UNLIMITED-MILEAGE
WARRANTY
BMW M850i xDrive ENGINE SIZES
• BMW M850i xDrive 2.0 Litre Engine
BMW M850i xDrive FUEL TYPES
• BMW M850i xDrive Diesel Engine Rebuilds
RELATED BMW 8 SERIES VARIANTS