I'm only posting because I've searched plenty of time for an answer to this question and haven't found anything definitive as of yet. Is the semi circular plug on the driver side rear of the head removable? I've been leaking oil from this area for quite sometime even though the valve cover is seated correctly and torqued to specs. If this "SCP" is leaking, is it capable of leaking a lot of oil as well. Lastly if this is removable, can I just reseal the current one or do I need to hit "Satan" for a new one?
#132459, "RE: Semi circular plug" In response to Reply # 0 Nov-26-10 09:20 PM by 420agreenvilleSC
the semi circular plug you're referring to is called the 'half moon' key IIRC. yes, it is removable.
Its a small piece of aluminum that sits inside a groove. get it out by hitting the top of it on one of the sides and it will start to spin upwards on the opposite side. It's a little stubborn to 'break' loose from the sealant underneath, but it'll come eventually. Take caution when hitting it downward from one of the sides as it's aluminum and you dont wanna create leaks down the road. Use plastic, wood or something like that to hit it.
Once it's out, use a tiny bead of rtv on the groove and push it down on the groove. You can use a small piece of wood to lightly hammer it down in place on the head. RTV might squeeze out a bit, just wipe excess.
here are a couple pics with the first pic showing it missing, the next pic showing it installed.
Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim
#132464, "RE: Semi circular plug" In response to Reply # 3
Gotcha. Definitely a good thing to know.
Originally posted by bullettdsm Just a point of interest; that half moon works so good that my 4g63 buddies also use them in their heads. Seals better.
#132476, "RE: Semi circular plug" In response to Reply # 6
Haha...thanks Mark. Seriously though, mine seems to be a pain in the ass. Last time I did the valve cover I did the extra step of removing that piece, thoroughly cleaning it, and then putting it back on with a nice bead of RTV, and it still weeps a little. Really don't get it, and at this point I have decided to just deal with the small leak.
#132477, "RE: Semi circular plug" In response to Reply # 7
I think I fixed mine for sure. It hasn't leaked since I resealed it. I've had that leak for so long and it wasn't a little leak for me that I almost got used to it. Fingers are crossed right about now.
