Timing chain tensioner seal replacement

[Sid_E46]

You've definitely got the best access to this that you'll ever have with the engine out of the car, so I would replace it. Undo the tensioner, make sure the sealing surfaces are nice (I usually run some red scotchbrite over them), replace the crush washer and reinstall.



Nah, should be fine to reuse. But make sure you follow the reuse instructions:

Never seen this before, is it a necessary step, and why so if anyone has that information?