Valve Cover Gasket replacement Subaru WRX/STi:
6.) Once your valve cover comes off, it should look like this picture below. Remember to run your finger along the lines where the gasket should be sitting, check for any old gasket pieces that might have broken off and gotten stuck. You want a nice gasket in there and to sit flush.
7.) Clean the valve cover with engine de-greaser (both sides, in and out), spray a lot on it, and use a steel brush to clean it off if you need too.
8.) When applying the sealant, make sure you have a nice thick line going all around. Let it sit for about 10 minutes. Then, put the valve cover gaskets in. Push them down a little by running your finger along the valve cover gaskets. Also apply a thick line of sealant along the gasket once it was set in, so it seals Head->Gasket.
9.) Retrace these steps to put the valve cover back on. When putting the bolts back onto the valve cover….be extremely cautious. If you over tourqe these bolts, it will cross-read and destroy your head. Only screw then with one or two finger until it comes to a complete stop. For those with a torque wrench that has a meter, good luck with getting the bottom three.
Valve cover gasket:
Gasket sealant: (Use Genunine Subaru gasket bonding sealant.)