Hoping someone can give me some advice.
My Sons 2007 BMW 318i E90 N46 engine developed a timing chain rattle on start up and it would only drive in limp mode, engine amber light displayed. The fault reader displayed error code 2B63 camshaft sensor exhaust. From my research it looked as though the timing chain had jumped a few cogs and put the timing out. The car then stopped working altogether.
Obtained timing chain kit and cam locking tools and took off the cylinder head cover. located tdc and put the pin in the flywheel. Unfortunately it looks as if the chain has jumped quite few cogs. The exhaust cam at tdc is approx 90 degrees out and the inlet cam approx 10 degrees out. On turning over the engine by hand I cannot hear the valves hitting each other or the pistons (fingers are double crossed that there is not any damage in this area!)
The repair manual talks about putting the cam locking tools on but doesn't seem to talk about what to do when the cams are so far out of alignment. If I rotate the engine another 360 degrees neither of the cams are anywhere near in alignment so I think the original tdc as shown in the photo below is the correct tdc. Advice would be appreciated if I've got this wrong.
My thinking at the moment is to take the flywheel tdc pin out, wind the engine anti-clockwise 45 degrees so the pistons are not at the top. Take off the camshaft adjustment unit bolts and take off both cogs. Turn both camshafts to the correct position and put the cam locking tools in place and move the engine back to tdc. Is this the correct way to go about it? Do I need to turn the cams in a specific direction (clockwise or anti-clockwise? Turn the cams individually or both together?
With having to move the cams such a distance do I need to adjust anything else so that nothing breaks on start up e.g. eccentric shaft?
Advice in the above areas would really be appreciated
I've included a photo of the upper guide showing the break. The vibration pulley has got four bolts instead of three so I had to drill another three holes in the crankshaft hub holding tool.
I have posted the above on other BMW forums and would really appreciate advice on this area