2.0 Diesel (D4204T5) Balance shaft set up

[sidubber]

Im in the UK I have just rebuilt my 2015 XC60 2.0 diesel (D4204T5) due to it using excessive amount of oil. I replaced the piston rings (oil control ring was clogged.) before rebuilding it the engine run lovely. After rebuilding it runs lovely no error codes plenty of power but i have a whistle/whine. Ive smoke tested the intake and exhaust side, no leaks, checked the timing belt all ok, removed the accessory drive belt, noise still there. listened with a stethoscope and the noise seems to be coming from the sump, I think the balance shaft assembly. I followed the workshop manual but the version of VIDA I have it said nothing about timing or aligning the balance shaft just remove and then install. The engine was silent before I rebuilt it so maybe i haven't aligned it quite right?. can you advise me what to do, can i re-align mine? if so how. Can anyone share how to do this Would really appreciate your help as there is not alot of info about it.