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Are you changing it because it's leaking? If so, there's a "little" more work you might want to think about while you're in there. Such as the cam chain tensioner seal, half-moon seal, and ultimately servicing the PCV system to prevent a rapid re-occurance.
 

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Having done it about 300 times, I can tell you it is one of those jobs that is deceptively difficult, especially if you approach it as being quick and easy.

If you do not disconnect the two hardpipes that run beside the passenger side of the cover, you will be cursing and fighting them throughout the process. Disconnecting them and out of the way however, entails removing the heat shield and cutting a number of factory hose clamps. The Y-pipe at the back of the cover can also be a source of frustration because there is so little give on such a short hose. If the hose is old, you may even put a hole in it, in the process.

You must also remove the fresh air intake and upper timing belt cover, which can be quite a PITA for the uninitiated.

Lastly, the valve cover must be lifted just about straight up. Any angling will cause it to hang up on the multiple bolt studs that secure it to the head.
 
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