I am just wondering how much of an issue this is still. ... It’s tough to diagnose those symptoms without any codes. The engine timing chain is very weak – it stretches over time, and ultimately snaps. BMW issues a service bulletin for models powered by the N63 4.4 liter V8 engine. BMW’s “hot-vee” design for the N63TU engine, released in 2012 as an updated version of the original N63 engine, was implemented to save space under the hood, the lawsuit explains. Finally, drain and replace the engine's oil and filter. Significant misfire now and immediate dtm. The diameter of the inlet valves is 33 mm, the diameter of the outlet valves is – 29 mm. The sophisticated workshop diagnostic computer can actually measure how much wear is on the chain and technicians were instructed to run this test during the Customer Care Package. Once it runs for about a minute or two, the idle starts to jump and I hear a 'clacking, diesel sounding noise', then the Drivetrain Malfunction, drive moderately light. They should be completed only based on parts availability, workshop capacity, and the customer's. I like your drive to do this,,,,the vacuum pump on the E66 N62 was in the front and really easy,,,,on the N63 you will have to get under the car to remove one of the heat shield bolt on the passengers side,,,,you will also have to climb on top of the engine to reach the bolts for the vacuum pump,,,,it sounds like you have your mind made up to do this,,,,good luck and take your … 99. It says exhaust valve too high? Still misfires in cylinder 6. N63 getting the timing chain repairs and valve stem seals,,,,here’s some pics with the heads off,,,,,and all the parts spread all over the shop floor and work benches,,,,trying to keep track of all the bolts and brackets and misc parts,,,,this … N63 getting the timing chain repairs and valve stem seals,,,,here’s some pics with the heads off,,,,,,and all the parts spread all over the shop floor and work benches,,,,trying to keep track of all the bolts and brackets and misc parts,,,,this is no dream job,,,,I don’t know any tech that likes this job, I have a misfire in cylinder 6. 5% coupon applied at checkout Save 5% with coupon. To avoid future valvetrain wear, the vehicle must be reprogrammed and a shorter oil. Page 16 Previous Customer-pay Repairs BMW of North America, LLC will provide reimbursement for “qualifying customer-pay” timing chain repairs” that were performed on an eligible vehicle prior to the release of the N63 Engine Timing Chain Inspection Measure. I know that the plug wells seems to me very clean , and ya the plugs look burnt to a crisp on cylinder 6 and will check the others and recently replaced plug. A Bmw 750 Li Timing Chain Tensioner Replacement costs between $5,184 and $6,478 on average. Timing gear X A new tooth-roller chain is used in the timing gear. Am I correct in understanding there's a history of this problem, and what compensation should be sought from BMW for this premature failure? Why Timing Chain Stretch and goes Bad in BMW engine. I have heard of the valve stem seals going but not sure how to diagnose those. ... BMW did an … MR CARTOOL 6PCS Camshaft Chain Locking Alignment Tool Kit Engine Timing Tool Fit for BMW N63 S63 N74 Vanos V8 X6M M-Series 550i 750i 760i. BMW has issued another recall for N63 V8 twin turbo engine. At 63,000 miles with a full BMW service history and bought from a BMW dealer, my 2007 model year car has a timing chain failure as diagnosed by my local BMW dealer. The mechanic has now said the timing chain has prob slipped or the vanos is needing replaced. This time around BMW has found that the timing chain can stretch resulting in valvetrain wear and reduced performance. Normal cold start. Your email address will not be published. Get a free detailed estimate for a repair in your area. Car was supposed to have had CCP and new injectors, recently 10k ‘miles plugs replaced, two hpfp, but receiving a misfire cylinder 6 and Carly coded “fuel pressure too high “ $68.99 $ 68. Ok here are your typical catalytic converter on a N63 or N63tu,,,,customer said check engine light came on,,,,we found rich mixture faults and bank 1 catalytic converter low efficiency ,,,,performed a catalytic converter test,,,but that didn't help,,,so welcome to modern technology,,,,I took a bore scope and removed the down pipe and found the catalytic converter… But every google link refers to the dreaded N47 timing chain problem. Is this a vanos issue or no because it’s just one cylinder, It’s not a vanos issue because it is only one cylinder,,,,when you said the spark plug is charred,,,,,was it covered with oil,,,,,are you burning oil?,,,,,,does your car smoke out the tailpipe after idling for awhile,,,,,maybe valve stem seals are bad and causing your misfire on cylinder 6, Really depending on the situation. Over the past decade, BMW and many other import automakers have had issues with timing chain stretch. Most noiceably when put in reverse. The BMW N63 is a twin-turbocharged V8 petrol engine which has been in production from 2008 to present. BMW N20 and N26 engines allegedly suffer failures of the primary and secondary timing chains. Sounds like you have a bad fuel injector,,,,I know you don’t like the dealer but it is cover under CPO and would cost you $50 plus the tow,,,,,what you could do is pull out cylinder 6 spark plug and see if it is fuel soaked and that will tell you that the injector is bad. 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