I have in the past year and a bit,purchased two 10 valve auxiliary belt tensioners,one for me and one for a mate,both were genuine Alfa parts and both had absolutely no grease in them!!
I found out about it on mine when it seized up after about 15 months,upon stripping it down,the main shaft and bearings were bone dry and going white and fluffy,as alloy does when it corrodes.The 'o' rings were obliterated but luckily the actual bearings were not very worn at all,so a quick clean and packing with grease and all is well.
I ordered another tensioner at the weekend for a mate who has just bought a 156 JTD and out of curiosity took it apart . . . . . surprise surprise NO GREASE!!!!
Both were genuine Alfa parts,bought from different suppliers,but it is no wonder these keep giving problems.
So if anyone has just bought a genuine Alfa tensioner and wants it to last,take it off and put the grease in it that Alfa should have in the first place!
Must be a nice little earner,over a £100 for a part that will last 18 months then need changing . . . . .
Not sure if non genuine ones are the same,but it has got to be worth checking them too!
Thought I would put this up,not sure if it has already been said,but hey, it may save someone a load of aggro