When would you recommend rebuilding the spring loaded tensioner? I have a set that have a few thousand miles on them, then they were removed and bagged for 12 years. Would the O rings go bad from age? One tensioner's piston can be moved about 2mm by hand pushing against a block of wood before stiffening, the other cannot be moved by hand.
Also determining the type that can be rebuilt. The part no. on mine looks like 930.105.501.OR the book states "only tensioner with part no. 930.105.049.00". Mine seem to have identifying features, Chamfer on upper housing, total height 78.2mm & mounting boss stop, but doesn't show the trade mark like the book. Attached is pictures of one.
