That should be sealed from factory. I have no idea how that blew open. It will either need to be plugged or the head replaced.

If it is truly leaking from there, you have correctly surmised that the reason would be the cam cover seal is breached somewhere around the circumference of the hole. It's unusual for that spot to leak, more commonly the oil comes from somewhere else (e.g. oil cap, hose to the top from PCV) and look...

I am having trouble finding a good clear picture of that hole on a cam cover in its good working condition. For example here is is on a (presumably good) engine but we can't see it close up. hole.png I suspect, and I can't confirm this, that it's supposed to have some plug in there to prevent oil fr...

I know I replied to this last night... That hole is normal and as you guessed, there seal on the cam cover has failed, for whatever reason. There is another THREAD on this forum discussing the same issue. I read a long thread on it and searched on some others a while back, but can't remember where i...

You can "rent" a combustion gas tester for free from most auto parts stores. You just have to buy the test fluid. Detects the presence of combustion gases in the coolant. With these test kits a yes answer is unambiguous, and if there are combustion gases in the coolant then absolutely the ...