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Old 05-13-2019, 12:20 AM   #1
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Default Alpha 1 gen 2 unknown part

hoping someone can identify this.
it fell to the ground when I separated the lower half to replace the impeller

cant figure out where it goes
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Old 05-13-2019, 01:48 AM   #2
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See Mercruiser manual #14 for the Alpha drive. I believe its the water pump dam. Should fit into a channel behind the pump housing.
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Old 05-13-2019, 02:21 AM   #3
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I have a rubber filler plug there
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Old 05-13-2019, 03:36 AM   #4
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I cant find that part anywhere on the alpha 1
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Old 05-13-2019, 11:00 AM   #5
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That looks like the spine of an exhaust shutter.
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Old 05-13-2019, 11:29 AM   #6
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Quote:
Originally Posted by jrsick View Post
That looks like the spine of an exhaust shutter.
Good call. One or both (depending on what engine you have) of your exhaust shutters needs to be replaced. These are to prevent backwash from going up the exhaust and into the engine.
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Old 05-13-2019, 03:46 PM   #7
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thanks guys.. that one stumped me when I heard it hit the ground

is that something I should repair before putting in the water again?

is this a fix I can do myself?

I have a 2006 - 3.0 mercury
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Old 05-13-2019, 06:21 PM   #8
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I would repair it, only one with the 3.0. Go to Documents of this site and get the Mercruiser Alpha manuals for the 3.0 and Alpha for directions.
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Old 05-13-2019, 06:30 PM   #9
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The exhaust shutter will prevent water from coming into the engine via the exhaust.
As a general rule, never let your wake catch up to you and slap the back of your boat. At least, not without some power on the boat. But if you do catch a wave astern, the exhaust shutter will prevent water intrusion.
While you have your exhaust apart, you can also check your risers for corrosion.
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Old 05-14-2019, 02:43 AM   #10
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wow.. you guys really know your stuff
appreciate all your help.
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