I am still new to the current engine that I have,so the question that I`ll ask may appear stupid,but anyhow...When I start my Merc 170 I notice that some warm air is coming out of an opening at the rear top portside of the engine.When I shut the engine down that air with an audible hissing sound continues to be released for few seconds.Seems like some pressure has been built inside the engine that is beeng relieved.Also I observe bubbles coming out from a spot in the gasket between the engine and the exhaust manifold at the fourth cylinder.How should I read these symptoms?I live in a country where spare parts and reliable diagnosis are hard to get ,so I will really apreciate your insight a lot !Thank you!
