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Mercruiser 8.1 Horizion exhaust manifold lifespan?

Discussion in 'Sea Ray Yacht' started by Capt J, Jun 4, 2011.

  1. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
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    14,432
    Location:
    Fort Lauderdale
    One of the boats I manage has the Mercruiser 8.1liter Horizons, the motors are 2003. They had the exhaust manifolds changed April 2007 and have the Mercruiser Cast Iron Manifolds and dry joint s/s risers (not the Aluminum setup). Does anyone know the expected lifespan of these manifolds? The boat (34' Searay) is operated solely in Saltwater and they are never flushed.

    Does anyone know the recommended change interval for these? I've heard 4-6 years, and on the other end of the spectrum I've also heard the s/s risers will last forever and the manifolds will last 8 years.