Debating on Whether to Attempt Changing the Timing Chain Tensioner;
I have an '08 Cobalt with the original style tensioner and 202k miles - more recently I've noticed that it has that rattle on startup. It goes away after a second or so, but it's still unnerving to me.
I ordered a new tensioner, and it should be here shortly, but now I'm second guessing myself on whether to change it.
The more that I read about it the more I worry about causing the timing to go out when changing the tensioner out.
I spoke to the shop I usually deal with when things are out of my capabilities and they tried to convince me away from swapping it out. Citing the fact that if I happened to take it out of correct time I'm going to into a much bigger repair.
How much risk is it to change this thing out? I've seen about removing the valve cover in order to ziptie the gears and so on. I'm worried about down on the crank where I can't see.
Thanks in advance for any insight.