N47 Timing Chain Issue

The N47 engine family is prone to excessive timing chain wear and premature failure. Rattling noise from the rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair. The issue applies to all applications and power variants of the engine produced from 01.03.2007 to 01.03.2011. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. UPDATE – It now seems that there are issues appearing with a limited number of engines manufactured after the supposed sale date of 01.03.2011.

At KMK Autos our technicians do offer following procedures regarding worn timing chains:

  • Engine operating noise check to quickly identify timing chain noise.
  • Timing chain test to measure wear ( elongation)
  • Complete replacement of timing chains, guides, sprockets and tensioners with upgraded parts.

If your vehicle mileage is  80,000 to 100,000 miles – call 02086898088 and ask for advice.

Why you should use KMK for timing chain replacement.

We only install original engine parts manufactured by BMW – copy parts can fail after 20-30k miles… Original timing chains usually fails at 100-110k miles but cases of failure did happened with mileages just little over 80k miles.

What happens when timing chain fails.

When timing chain fails, engine camshaft opens cylinder valves at wrong timing, causing piston hitting and breaking valve, valve rocker, damaging hydraulic valve lifters and camshafts. Cylinder head can suffer damage depending on at what speed piston was travelling during the impact (engine RPM). Piston can also get damaged from the impact and cause compression rings to seize.

Why it is important to replace worn timing chain and components before it fails completely.

New N47 engine of the shelf cost around £7500,- plus £800,- to install ( POA ).

Rebuilding BMW engine with original parts in UK should cost around £6000,- …Copy parts are simply unreliable although this is the only way for engine repairers to keep the cost low and sales high. Also wast majority of so called reconditioned engines are assembled using old pats from salvaged engines. So realistically you are buying poorly repaired engine with inbuilt guaranteed failure.

Another, most popular solution is to find good condition low mileage used engine. This way you can get away with roughly paying £1500 – £2500,- for an engine and around £700,- for installation including oil and filter as minimum. That’s totalling to £2200-£3200,- No need to mention that used engines comes with part only warranty meaning if engine fails withing warranty period which is normally 30 to 90 days, supplier will send you another one but you, the owner of the car will have to pay workshop second time for removal and installation plus delivery cost. Please be sure that you wont get low mileage engine for £1500,- : car breakers know what they’re selling and as rule of thumb good clean engines with noted (still untraceable) low mileage are priced at close figure to £2500,-

Cost of full timing chain kit replacement with original upgraded BMW parts starts from £1360,-
N47 engines have no other design issues and can easily run 200,000 miles if maintained correctly plus it is your original engine with traceable service history and mileage. Call our service team and book you BMW for timing chain test where KMK technicians will measure timing chain elongation level as not all worn timing chains due issue characteristic rattle noise ( those with noise do need replacement in almost 100% of cases). Alternatively you can submit request for a quote by clicking here.