Ok this is going to be a long post with a lot of pictures,,,,N55 check engine light on,,,,faults were valvetronic motor and valvetronic won’t reach its limit,,,,performed the test plan,,,operated the valvetronic motor test which passed the test twice,,,but when I started the engine it would fail again ,,,,which tells me all these BMW test are not always correct,,,,lol,,,after more testing it finally said the valvetronic motor and the eccentric shaft should be replaced ok,,,,now the fun started. Here you can see I already removed the fuel injectors and the 3 injector and spark plug stands,,,you have to remove them to gain better access to the valvetronic motor,,,,,also notice the oiler line,,,,you should also replace this at the same time. Here you can see all the injector and spark plug stands removed. Now the fun started,,,during inspection I found the intake camshaft lobes pitted,,,only cylinder 5 and 6 were pitted,,,,we have no idea what caused this or what happened,,,,now are repairs have changed,,,,we are going to replace the valvetronic motor,eccentric shaft,roller rocker arms and eccentric levers. Here the valvetronic motor which is just a worm gear ,,,,,which can move the eccentric shaft very fast.now here is one of BMW over engineered tools needed to remove and install the the eccentric shaft lever springs,,,,you need this tool to perform this job,,,,there is no other way to do this without hurting yourself.,,,even with this tool you can hurt yourself,,,,,there is a lot of tension on those springs. Here is the new intake camshaft and eccentric shaft,,,,you can see the gear on the eccentric shaft which locks into the valvetronic motor. When replacing the eccentric shaft there are also 6 needle bearing that have to be replace,,,,the needle bearing and the 2 bearing half shell bearing.this I show you replace them,,,,,they are a split open,,,,you carefully spread them open over the eccentric shaft and make sure they spin freely. Here are all the new eccentric shaft levers. When replacing the levers and the roller rocker arms,,,,they all have numbers on them,,,,,so when you order new ones you need to know what the number is in the engine now,,,,the levers and the roller arms are both 02. Here is the roller rocker arm you can see number 2 stamped in it. . Her is the final assembly ,,,what I also forgot to say the vanos gear is removed,,,,because you will be timing the engine,,,,once your done you hope it starts,,,,you also have to perform a teach in for valvetronic motor ,,,,it performs about 50 test without it failing,,,,if it fails you have to start the test all over again.
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