When replacing the valve cover gasket I see majority of posts say to replace covers complete, however I see gasket kits with coil o-rings....not having done this job before what is the issue with re-using existing covers?

Thanks!

 

It's highly recommended to change the actual valve cover along with the gasket. The valve cover has seals around the spark plug wells to keep oil out of them but they degrade over time. If you're going to take the thing apart for the gaskets just do the covers as well. There should only be 4 parts you need: 2 valve covers, 2 valve cover gaskets. Buy OEM if you can, they are expensive but people have had issues with cheaper alternatives.

 

Thanks. Don't I need the plenum gasket too?

Sorry for all the questions, but my history is with Saabs and this is the first 350Z for me.

SC

 

You could certainly replace the plenum gasket after you take it apart for this job.

 

Hi Stico,

I found this post regarding the valve covers and the spark plug well seals. The OEM baffle plate is the main reason people just purchase new covers. For one reason or another, Nissan decided to make the baffle plate in such a way as to prevent easy replacement of the O-Ring/Grommet seals for the spark plug wells. The plate appears to be permanently glued in place. Another reason for replacing the cover is because of the chosen material. Over time these plastic valve covers can warp, causing continued leaking problems even after replacing the seal. I miss the days when quality materials were used in areas like this. I did a valve cover job on a 1999 4Runner, both valve covers were aluminum as well as the entire intake manifold + plenum assembly.

Luckily this issue is relatively minor and a set of new covers should last over 100k miles.
Cheers,
-Icer