Intake manifold?

[kcvpr]

I am about to start working on my KA, replacing the knock sensor. And I was thinking about going the route of taking the intake manifold off to get to it.

And now to my question, do I have to replace any seals, or o-rings, ect when re-installing it?

Sorry if this has already been asked, I did a quick search and found nothing.

Thanks for your time.

[Monooxide]

You may or may not need the intake manifold gaskets, other than that you're good.

[projectRDM]

The gaskets usually will crack when removed so go ahead and get them in case they do. There's one to the head and one to the plenum, if you pull the entire thing in one piece you'll only need the one to the head.

[Ceepo]

Change the manifold gaskets, also check all the coolant hoses under the intake manifold(leaks and rotten hoses) just a thought...