Exhaust Shutter Inspection

PartsMan

Last night I pulled the boot to inspect the shutter. It must be below the water line because water came pouring into the boat. I thought you could inspect the shutters while in the water.

212rowboat

you need a riser spacer.......... or two....   

if the flaps were in good repair, there should not have been a flood- a trickle beyond doubt, but no huge gushers. 

PartsMan

OH! It's gushing

Dream_Inn

Extra weight in the back of course wouldn't help either.  Dinghy?  Trunk or back seat full of stuff?

212rowboat

wake or tide can certainly assist, too.   but... if those flaps were operating properly, it would be limited...  

a matter of fact, if weight or wake/tide could cause such, I'd still lean toward adding at least a two inch riser spacer on either side... 

PartsMan

maybe I didn't explain myself .... I was at my dock and tried to pull the boot off to inspect the flappers and water is gushing in as if the flappers are below the water line. I thought I checked them a couple years ago while in the water. Can you change the shutters while in the water?

212rowboat

I'm thinking there are exceptions, but isn't the intent of dry joint exhaust to have the top of the y above the waterline?  I thought so, at least. 

rasbury

I just don't stop learning stuff here- what I can do with the knowledge who knows but I do like to understand. When I have been looking through engine manuals, I did not understand different risers or I guess really spacers, but different boats will have different water lines so the engine mfg. has to make different spacers to keep that relationship between the motor and the water line, correct?

212rowboat

correct. 

212rowboat

but... the riser spacers will have zero impact on whether his Y pipe floods or not... the flaps should control that when the elbow is on them as their ability to flip UP is severely limited, but their ability to flip down is not... the top of Y is generally at the top of the transom plate or close thereabout...

the comment about needing spacers derives from my own thoughts, which is very pro-safety margin... if the waterline is at or above the top of the Y pipes, and the top of the elbow where it slips on the riser isn't at least a good six to eight inches higher than that, and without healthy flappers- it seems to me that a good wake, wave, or tide could easily push water into a resting engine- and where it would lay there in wait for an unsuspecting captain to come along and turn the key- Crunch... hydro lock. 

rasbury

I had another boat that overheated, it was suggested not to worry about it- I figure there are no extra parts so I replaced them although I did nor understand at the time exactly what they were for...

PartsMan

I'm having a water flow issue and going down the check list, I'm at the exhaust shutters. I'm getting a lift out on Friday.

Problem: Once on plane for 5-10 mins I'm getting a water flow alarm sending the boat into guardian mode. 

Michael T

Are you getting increased engine temperatures? I was getting the same thing - but engine temps were normal - it was a faulty sensor. You could also have a kinked water supply hose or a spongy hose that gets drawn tighter with the pull from the impeller.

PartsMan

I replaced my exhaust shutters and they were destroyed. One of the shutters was missing both flappers. The Y pipe is clear and I reached into the drive as far as i could and no flappers. How far down will the flappers be able to travel in the drive??


 

aero3113

They can make it all the way down to the transom/gimbal housing.

PartsMan

With the updated exhaust boots it's open if the drive is raised, but when drives down the flapper could have traveled into the drive. The Y pipe is clear and first couple inches into the drive is clear.

aero3113

If you can get your hands on an inspection camera/borescope you will be able to see all the way to the drive. They are very reasonably priced now and a great tool to have.

Black_Diamond

You can rent them for free from Autozone.