This is sort of a followup to a previous post, but I'm going to attempt a valve cover replacement on a GMC 2.8L V6 engine (1985) and need some technical advice. The reason for this replacement is due to a very persistent oil leak that is thought to be due to warped OE valve covers. The question I have is about the actual gasket material and the best way to insure sealing of the leak.
First off, do I need an actual rubber-type gasket for this or just the RTV sealant? The Haynes manual mentions applying a layer of RTV sealant to the cover and then bolting it on, saying nothing about a rubber or cork gasket. However I know the pre-formed rubber type are sold at auto parts places and such. Do I need to use one or the other, or can I use both to insure a good fit? Since I'm trying to seal of a persistent leak I tend to want to apply as much gasket material as possible but I don't want to go overboard and do something stupid.
Also, I remember hearing a suggestion a while back that you could double up and use two cork-type gaskets instead of the usual one to form a better fit and stop leaks. This seems like a strange thing to do and I was wondering if anyone had any thoughts on that.
If I can use RTV and rubber together, do I apply RTV to the cover and the engine or just the cover side?
Sorry for these ignorant questions but I've never done this before. I am also posting this question to
Casey