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Because the water pump is behind the timing belt, you would have to almost do the job over again should the pump fail. Looking at the pump , if you see limescale formed on it coming out from underneath the belt gear , that is the beginning of the end. (limescale is that white mineralization that forms on your shower head over time ) Try to use a dealership gasket . There are seven bolts total and a lot of antifreeze will flow out even if you empty the system into a bucket down below first
Have a sharpie marker and mark the exact position of the cams before you take the belt off as the little notches on the cam wheels did not line up with the cover in my case . Also on my 2005 there were no marks on the crankshaft belt gear so mark those as you find it.
At 115k my dealer original belt was fine but the idle pulley was leaking a tiny amount of oil. The tensioner was fine and neither pulley was making any gravel noises. I did the job because one place wanted $1150 for it and another wanted $950. You can get the new timing belt on without removing the drive belt pulley (30mm socket required ) by removing the two bolts and plastic guard just behind it and finagling it on. Or you can just pay someone !
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