Why mercruiser recommended maintenance manual doesn't mention anything about exhaust manifold and riser inspection after 3 years

[Gar1]

They should, mine cost me the Starboard engine when water started leaking through the jacket and sucked into the heads and bent the valves.

[Eddie64]

I bought mine a 2014 SDX, from Marine Max used last year. Having nothing but trouble since we bought it. MM took it for service after only 5 months after purchase. They said nothing wrong with boat did free service which was never done. The day I pick it up it was giving me issues after months of me fighting with MM they now say it’s the manifold and not covered under warranty. This should have been done prior to our purchase since the boat was 4 years old. Shame on me for not doing an inspection but I will never buy or recommend Marine Max Clearwater or St pete

[wingless]

If I ever had the opportunity to have a discussion with a Mercury engineer about their decision to run salt water through cast iron, then I would give them an earful of feedback.

My exhaust parts would last three to four years, I would then discard / replace those obscenely expensive parts using OEM Mercruiser parts and the clock to failure would start all over again.

Years ago I redesigned my exhaust system, from salt water sitting in cast iron 24/7/365, with NO way to drain, NO way to flush, to flush with fresh water, soapy water, Salt Away, then drained bone dry after each usage.

The parts still look brand new.

Prior to this change I would split the gasket seam every year to gauge if the parts were still good. Now they always look good.

[Drago]

What did you modified?