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Exhaust treatment for outboard motor

  • US 5,554,057 A
  • Filed: 12/14/1993
  • Issued: 09/10/1996
  • Est. Priority Date: 12/14/1992
  • Status: Expired due to Term
First Claim
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1. A marine outboard drive comprising an internal combustion engine having at least one exhaust port, a drive shaft housing and lower unit adapted to be supported upon the transom of an associated watercraft and having a propulsion device driven by said engine for propelling said watercraft through a body of water, an underwater exhaust gas discharge formed in said drive shaft housing and lower unit for discharging exhaust gases to the atmosphere through the body of water in which said watercraft is operating, exhaust conduit means for delivering exhaust gases from said exhaust port to said underwater exhaust gas discharge, and purging means responsive to a condition for precluding water from flowing above a predetermined position in said exhaust conduit means by purging water from said exhaust conduit means.

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