Re: Clack, clack, clack...
 

I just dont want this guy to tear his engine down, 'til he rules out easy Chit!!!

Re: Clack, clack, clack...
 

The "tips" stick out about .5" and they have a rubber flap on them. The exhaust comes out of the riser toward the rear, makes a dip downward and then back straight through the hull.
When I looked in the exhaust last night I couldn't see any flappers. The exhaust has a rubber hose that connects to a metal pipe that bends downward and back and then another rubber hose. Would there be flappers that far up in the exhaust so you can't see them?

Re: Clack, clack, clack...
 

Take a pic!!!

there shouldnt be flappers up that far, but if its what I think your explaining, there could be diverters??? could be something loose, but less likely than the internal flapper noise.

Re: Clack, clack, clack...
 

I don't have a switchable exhaust.
I tried checking around for something loose but I couldn't find anything. I looked up front near the accessories...nada. I looked near the output shaft and nothing there either. When it happened at the lake I looked around for over an hour trying to figure it out. I can't tell if the the noise is coming from port or starboard either.
I don't have a digital cam handy but I'll see what I can do tonight. Thanks for the responses so far though.

Re: Clack, clack, clack...
 

http://216.37.204.201/mercruiser_oem...111&A=113&B=13
That's what the exhaust looks like.

Re: Clack, clack, clack...
 

There is a flapper in the Y-pipe...

Re: Clack, clack, clack...
 

So, should I pull the elbow and inspect it?

Re: Clack, clack, clack...
 

Hopefully isn't anything too bad if it's not loud enough to hear outside the boat. You can "listen" to the valve covers or different areas using a long wooden handle screwdriver or long wooden dowel. Think of it as a caveman's stethoscope...If all else fails might run a compression check or pull valve covers to rule out bent valve.

Re: Clack, clack, clack...
 

Loose plugs are a danger sign of detonation. Electodes changing gap can be too. Just a thought. These observations should be a huge red flag to look at a/f mix, fuel quality and ignition control.

BT :cool:

Re: Clack, clack, clack...
 

Thanks for the suggestions. I'll check it out ASAP. The plug color looked good. I pulled the valve covers yesterday and everything looked kosher. I did tighten up the rockers since they were a little on the loose side but it didn't make a difference in the noise.

Tim