According to Alfa philosophy and procedures the engine should never be turned backwards!! When you do that the tensioner slackens and there is danger of contact valve/pistons, not necessarily but best to avoid! If you have a new mechanical tensioner I think you can rely its safe to use, but never turn this engine backwards, whatever tensioner!
If you wonder if the tensioner is tight enough when turning the engine the right way, there is a thumb rule that you can turn the longest passage of the belt max 90 degrees. then its OK. Not more!
Last edited by Gabor K.; 08-10-2016 at 07:10 AM.