Hi Valdelisbmw

I'm in the process of changing the timing chain on a n46 engine and trying to get my head around the balance shafts. You mentioned above the the sump does not have to come off to replace the timing chain is this because if you are careful taking the crankshaft guide off the cog that drives the oil pump/balance shafts stays in the same place so that when you lower the cog with the new timing chain on you can just slide the guide back into place and replace the bolt. Sorry if this is a simplistic view of things but I cannot really visualize how it all looks not having striped one down before.

Thanks

Jon