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EXHAUST MANIFOLD GASKET REPLACEMENT
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<blockquote data-quote="muddywaders" data-source="post: 419449" data-attributes="member: 13234"><p>Have had this gasket fail on a 93 20hp merc luckily it was an external leak.Not sure why it failed not corroded and was never overheated.Same problem with a newer yamaha mating surfaces perfect but break in gasket.How would one detect an internal leak?excessive steam?rough running?washed piston crown or plug?powerhead damaged by that point?So yes change the gasket the merc ones are cheap.Be gentle when removing bolts as you probably already know use a small wrench and if you suspect one is frozen drill the head off.Once the manifold is off you can apply heat and penetrating fluid.Weld a nut or use vice-grips to remove remaining bolt.</p></blockquote><p></p>
[QUOTE="muddywaders, post: 419449, member: 13234"] Have had this gasket fail on a 93 20hp merc luckily it was an external leak.Not sure why it failed not corroded and was never overheated.Same problem with a newer yamaha mating surfaces perfect but break in gasket.How would one detect an internal leak?excessive steam?rough running?washed piston crown or plug?powerhead damaged by that point?So yes change the gasket the merc ones are cheap.Be gentle when removing bolts as you probably already know use a small wrench and if you suspect one is frozen drill the head off.Once the manifold is off you can apply heat and penetrating fluid.Weld a nut or use vice-grips to remove remaining bolt. [/QUOTE]
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EXHAUST MANIFOLD GASKET REPLACEMENT
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