Hi, i have a 02 1.2 DOHC corsa with what sounds like the descriptions above or possibley rattling stuck hydralic tappets on 90k with no history of the chain being replaced.
Tonight i have taken the rocker cover off to inspect what i was certain to be a worn/loose chain, only to find the chain was fairly tight on the guide that sits between the two cam gears/pullys.. if you pull the chain off this middle guide upwards with forcing the tensioner in, the chain will come off the guide by about 15mm... am i likely to see the chain slack? or will the tensioner always take up the slack no matter how worn the chain is?
Without stripping everything apart is there any other indicators to diagnose that the timing chain is worn/faulty? the chain seems to have a little slack in it between the links but nothing to major. When the chain wears/stretchs, does the tensioner take up the slack making the chain seem tight?
I have visually checked things quickly like the hydralic tappets but again nothing seems to be obvious without going to deep into stripping parts out. Any help much appreciated... i dont want to waste time or money replacing/rebuiding something that does'nt need it.
Also it may be worth mentioning i have tried the Wynn tappet cleaning stuff and it had little or no effect (so i am guessing its not a stuck tappet?)
Simon Demmery
September 2010