It'* not too bad of a job...get the alternator and all the support arms for it off, there are 3 bolts to pull the tensioner. I didn't bother with trying to drain any coolant (stupid or lazy?) only lost a quart or so of mix...just refilled it later. I used a little high temp RTV sealant on both ends of the plastic elbow, and I took the O-ring off of the 2nd elbow and put it onto the metal tube on the other end of the tensioner. (like BillBoost said)..I think I may have put a little RTV sealant on the metal end too. No problems no leaks..I also did the valve cover gaskets and it looks like that took care of my oil leak too.