01-14-2014, 03:51 PM
Tom and Chris,
I don't mean to hijack the thread but I too am looking at the riser and manifolds on my Mercruiser 502's. The mechanic who did the engine survey suggested the riser gaskets be changed. My engines have the stainless risers and to me the gaskets don't appear to be leaking. I'm not adverse to having them changed just want to be sure it's something that should to be done. Should I expect he same kind of life, 15-20yrs out of my fresh water cooled Merc manifolds? From what I understand, the gasket between riser and manifold, in this case stainless and cast iron presents challenges due to differing rates of expansion. Any opinions on that? Thanks, John
I don't mean to hijack the thread but I too am looking at the riser and manifolds on my Mercruiser 502's. The mechanic who did the engine survey suggested the riser gaskets be changed. My engines have the stainless risers and to me the gaskets don't appear to be leaking. I'm not adverse to having them changed just want to be sure it's something that should to be done. Should I expect he same kind of life, 15-20yrs out of my fresh water cooled Merc manifolds? From what I understand, the gasket between riser and manifold, in this case stainless and cast iron presents challenges due to differing rates of expansion. Any opinions on that? Thanks, John
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