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Exhaust Water Shutters
The Exhaust Water Shutters are located in the exhaust y-pipe. The shutters help prevent water from running back into the engine under certain circumstances.

When shutters get old they can make noise.
The shutters can start making a "clakity" noise.
The sound is often diagnosed as a bad lifter, connecting rod, gimbal bearing or a bad drive.
Bad shutters will only make noise at or just above idle.
Eventually a bad shutter can break loose and get stuck down in the exhaust pipe or in the drives exhaust passage.

If you have an older engine you might have the old 3-piece exhaust y-pipe. To replace the shutters in the old 3-piece style t-pipe the engine will have to be removed.

Newer y-pipes have the shutters located at the top of the pipe. The engine does not have to be removed to replace the newer style shutters. You will only have to remove the exhaust elbow from the manifold.

If your boat has direct tru-transom exhaust, your exhaust tips should have internal AND external shutters.

60930 Shutter $26.00
This is the most common shutter. It is sold in packs of one.
This fits models with the shaft in the center.
This fits inline 4 cylinders (GM and Mercury engines)(1982 and up) as well as 1973-76 Ford engines,
most 1985 and up V6 and V8 GM engines.



99370A2 Shutter $23.00
Sold in packs of one.
This fits models with the shaft offset to one end.
Fits model 185 V6 262cid (1985-87), 185 V6 229cid (1983-84), 200 305cid V8 (1985-86), and others.



If you are not sure which shutter design you have, simply email us with your engine serial number.

Sterndrive-Information
Change your Alpha Gear Lube
Change your Bravo Gear Lube
Why does my drive lube have white streaks?
Why does my drive lube have gray mush?
Replace Your Alpha One Water Pump
Replace your Alpha Gen II Water Pump
Rebuild your Bravo Raw Water Pump

Troubleshoot & Replace your Alpha Shift Cable
Troubleshoot & Replace your Bravo Shift Cable

Replace your Alpha One Bellows & Gimbal Bearing
Replace your Alpha Gen II Bellows & Gimbal bearing
Replace your Bravo Bellows & Gimbal Bearing
Why does my drive "Growl" when I turn?
Water is leaking into my boat from the transom

Replacing your Trim Sender Switches
My Trim doesn't work but my Trailer Switch does
My Trim Gauge is Pegged

Rebuild your Alpha One Upper Driveshaft Housing Assembly
Rebuild your Alpha One Lower Gear Housing Assembly

Check your Engine Alignment
Check for Excessive Steering Play
Troubleshoot an Overheating Problem
Should I remove my thermostat?
Why do I overheat when going fast?
Troubleshoot a No-Crank Condition
Troubleshoot a No-Start Condition
My Engine Backfires and/or Surges and has Lack of Power
What is an Anti-Syphon Valve?
My Engine blows Steam from the Exhaust
Why do I hear a "clakity" sound while at idle?
Exhaust Manifolds...IMPORTANT Information
How do I Winterize my engine?

What is Galvanic Corrosion?
I have a Bravo III Galvanic Corrosion Problem
What is a Mercathode?
All about Zinc Anodes
How do I check my carburetor?
What carburetor do I have? A Rochester or a Mercarb?
I have water in my fuel
My fuel smells like varnish
My fuel is old
My engine has been sitting for several months without being run.

I have a Mercruiser 470, 485, 488, 190, 3.7L Engine
I have coolant dripping from the front of my engine
Can I install a regular Alternator instead of the Stator-Rotor?

Converting an OMC to a Mercruiser


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