The mixing elbow on the motor combines the engine exhaust gases and the seawater that has circulated thru the engine and directs them to the muffler and the exhaust outlet. Unfortunately, because sailboats generally run their engines at low rpms for long periods, carbon from the exhaust builds up in the elbow and ultimately starts constricting the flow putting excessive back pressure on the exhaust. On my boat the result of this was that the engine would not rev higher than 2200 rpm when giving full throttle in gear. When it initially happened, I first suspected a fouled prop or a blocked fuel filter but then narrowed it down to a clogged mixing elbow. Swapping out the new parts was fairly straight forward. The attached picture is a view from the mixer from the exhaust hose end. My engine has less than 600 hours and I always rev the engine a few times at the end of a sail as prescribed in the Yanmar manual to avoid this from happening. In the manual, Yanmar also suggests "cleaning" the mixer every 250 hours or one year, whichever comes first.
On Oct 18, 2021, at 12:30 PM, mik <12mi...@gmail.com> wrote:
The mixing elbow on the motor combines the engine exhaust gases and the seawater that has circulated thru the engine and directs them to the muffler and the exhaust outlet. Unfortunately, because sailboats generally run their engines at low rpms for long periods, carbon from the exhaust builds up in the elbow and ultimately starts constricting the flow putting excessive back pressure on the exhaust. On my boat the result of this was that the engine would not rev higher than 2200 rpm when giving full throttle in gear. When it initially happened, I first suspected a fouled prop or a blocked fuel filter but then narrowed it down to a clogged mixing elbow. Swapping out the new parts was fairly straight forward. The attached picture is a view from the mixer from the exhaust hose end. My engine has less than 600 hours and I always rev the engine a few times at the end of a sail as prescribed in the Yanmar manual to avoid this from happening. In the manual, Yanmar also suggests "cleaning" the mixer every 250 hours or one year, whichever comes first.
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On Oct 18, 2021, at 3:24 PM, 'Ken Kloeber' via Catalina355 <catal...@googlegroups.com> wrote:
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On Oct 18, 2021, at 22:21, Delbert Patterson <delbert....@att.net> wrote:
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