Just to add a little.
Did not take engine out. Main tensioner broken as well as tensioner on balance shaft. Managed to get new balance shaft tensioner in without taking engine out. Took new spring off new base, notched the spring on the end that goes on the pin, bent old (still mounted) base down a little, installed new spring on old base (was not too easy, just be persistent), bent old base back into place. Did not take crank sprocket off either.