Do I Need to Change the Timing Chain When Replacing a BMW X6 Engine?

In most cases, yes, it’s strongly recommended to replace the timing chain when fitting a new BMW X6 engine, even if the old chain hasn’t failed yet. At BMW Engines Specialist in Grays, UK, we explain exactly why this matters, along with real UK engine replacement costs in UK, engine codes, and common faults. Whether you’re comparing a BMW Engine for sale or weighing up reconditioned engines vs used engines, read on before you buy or shop, so you understand what’s genuinely needed for a lasting repair.

Why Timing Chain Replacement Matters During an Engine Swap

Timing chains on many BMW X6 engine variants, particularly older N57 diesel units, are known for stretching and wear over time. If you fit a replacement engine but reuse an old or worn timing chain, tensioner, or guides, you risk premature failure shortly after the engine replacement is complete, potentially causing serious internal damage. Most specialists, including us, recommend fitting a new timing chain kit as standard practice during any major engine rebuild or swap, since the labour to access the chain is already being carried out and the parts cost is relatively small compared to the risk of comeback failures.

What’s Included in a Timing Chain Kit

A full timing chain kit for a BMW X6 engine typically includes the timing chain itself, chain guides, tensioner, and often new sprockets and gaskets. On some variants, the water pump and thermostat are also replaced at the same time, since they’re located nearby and share similar labour access. Fitting a complete kit rather than just the chain alone ensures all wear components are renewed together, reducing the chance of a related part failing shortly after. When you buy your engine through our supply and fit services, we can include a timing chain kit as part of the overall replacement package.

Average BMW X6 Engine Replacement Costs in the UK

Engine replacement costs in UK garages vary widely depending on the model, engine size, and whether a timing chain kit is included. On average, a full BMW X6 engine replacement ranges from £2,500 to £6,500 including parts and labour, with an additional £400-£800 typically added if a full timing chain kit is fitted at the same time. Dealership quotes can exceed £8,000-£9,500 including this extra work, while independent specialists like us typically save customers 40-60%. Always ask whether a timing chain kit is included in your quote before you buy or agree to any work.

BMW X6 Engine Codes and Specifications

Knowing your engine code helps confirm whether your engine uses a timing chain or belt. Common BMW X6 engine codes include N57D30 (3.0-litre diesel, xDrive30d/xDrive40d), N63B44 (4.4-litre twin-turbo V8, xDrive50i), S63B44 (X6 M performance V8), and B57D30 (later Euro 6 diesel). All of these units use a timing chain rather than a belt, meaning periodic chain wear is a genuine consideration on higher-mileage examples. Power outputs range from 245hp on early diesels up to 575hp on the X6 M. Always match your chassis code and engine code exactly when you buy or shop for a BMW Engine for sale.

BMW’s Latest X6 Engine Models in Detail

The current-generation X6 (G06) uses BMW’s newest engine family. The B58 3.0-litre turbo straight-six petrol powers the xDrive40i and M50i-adjacent trims, producing 335-375hp with updated turbocharging and direct injection for improved efficiency. The B57 3.0-litre diesel straight-six, used in the xDrive30d and xDrive40d, offers 265-340hp with reduced emissions compared to the older N57. At the top of the range, the flagship X6 M uses the S63B44 4.4-litre twin-turbo V8, later updated with S-series improvements, producing up to 617hp in Competition trim. These latest engines feature more advanced timing chain designs, though periodic replacement remains good practice during a rebuild.

Reconditioned Engines vs Used Engines: Which Should You Choose?

This is one of the most common questions we get: reconditioned engines vs used engines, which is better value? A used engine is removed from a donor vehicle and tested but not rebuilt, meaning the timing chain condition is often unknown or original. Reconditioned engines are stripped, inspected, and rebuilt with new wear parts, often including the timing chain as standard, giving you a longer-lasting, warrantied solution. For a BMW X6, where timing chain failure can be costly, we generally recommend reconditioned engines. With a confirmed timing chain replacement included as part of the rebuild.

Common BMW X6 Engine Problems and Solutions

Beyond timing chain wear, BMW X6 owners commonly report turbo failure, often solved with turbo reconditioning or replacement. N63 engines are known for oil consumption due to valve stem seal wear, typically requiring a top-end rebuild. EGR valve clogging and swirl flap failures also affect diesel models. Coolant leaks from plastic housings and water pumps are common across most X6 variants. Often addressed alongside timing chain work due to shared labour access. Catching these issues early with regular servicing helps avoid the need for a full engine replacement down the line.

UK-Wide Logistics and No Upfront Charges

Base in Grays, UK, we operate a nationwide logistics network to get your BMW Engine to you quickly and safely. With tracke courier delivery typically arriving within 24-48 hours across England, Scotland, and Wales. Our supply and fit services cover diagnosis through to road testing, with most X6 replacements. Including timing chain work, completed within 3-5 working days. We also offer no upfront charges and no deposit require on qualifying supply and fit orders. So you never pay until your engine and any additional parts have been source, check, and confirm ready for fitting.

BMW X6 Engine Model Comparison Table

Frequently Asked Questions

Do I need to change the timing chain when replacing a BMW X6 engine? 

It’s strongly recommended, as reusing a worn timing chain can lead to premature failure and damage shortly after the replacement.

Are reconditioned engines better than used engines? 

Reconditioned engines usually last longer and come with stronger warranties, while used engines are a cheaper short-term option.

How much does a BMW X6 engine replacement cost in the UK? 

Costs typically range from £2,500 to £6,500, with an additional £400-£800 if a timing chain kit is included.

Is a deposit required to order an engine? 

No, we offer no upfront charges and no deposit required on qualifying supply and fit orders.

How do I know which engine code my BMW X6 needs? 

Check your V5 logbook or engine bay plate, or contact our team with your registration number for a free check.