I am wondering if it is standard for the exhaust to be submerged?  I have a 1973 Commander 451 with Detroit Diesels and my exhaust ports are completely submerged,  I have checked 2 others a Commander 41 and a Commander 410 and both the exhaust ports are above the waterline.  The exhaust check valve failed last Nov on the 451 which sunk the boat in 15 minutes.  That was before I purchased it.  I am understandably concerned and would like to know if this is correct.  The painted waterline runs midway through the exhaust port, however once we put it in the water it is completely submerged.  It seems dangerous to have 2 six inch exhaust pipes filled with outside water trans-versing the inside of the aft cabin and most of the way to the engine room.  Can anyone shed some light on this, or do I have a bigger issue to deal with?

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After we got it back in the water and moved to my marina.

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My 1980 Model 451 has both exhausts just above the water line fully loaded.

Your in water photo does show that your boat is too transom heavy.

Maybe the weight of the add on on your aft deck encloser are heavy . Or has there been mods done to your aft cabin. OR maybe  larger tankage

There has been an extra tank added under the Aft bed, I suspect that the tanks are all full off water.  I thought it looked low in the water, but having more experienced eyes agreeing helps me.  Ill investigate that area closer.

Did you happen to look at my profile picture?  I dont think it looks low in it, however that was pre-incident, post incident, it certainly feels lower.

What is the capacity of the tank?  Was the added tank full when the boat sank? The waterline in your profile picture looks normal. You will probably solve your problem when the added tank is empty.

Boat Survey states that

the added tank capacity is 85 gallons.

the Water holding tank is 200 gallons

and the Fuel Tanks are 500 each or a total of 1000 gallons.

If totally full of salt water that would be 11,436.5lbs plus 267lbs in other areas for a total of 11,703lbs.

the docs I have received from the Mariners Museum states

Water capacity of 175 gallons

Fuel capacity of 5500-600 gallons

and extra holding tank of 85lbs.

So that would be a total 860 gallons or if totally full of salt water that would be 7,654lbs plus 267lbs in other areas for a total of 7,921lbs

In either Scenario thats a lot of extra weight.

Your fuel tanks are 250 gallons each for a total of 500 gallons. That being said my 451 exhausts are completely out of the water with fuel load of fuel 500 gls and 200 gls of water on board. 

Are you sure there is no water in the aft bilge 

I could only see under the aft bed and couldnt see any substantial water.  I had a small leak around the trim tab which put some water into the bilge in the engine room.  Once it was pulled and cribbed again the bilge did seem to keep getting water in it from the aft area.  (Slowwwly)

Is there a compartment located on the mid to starboad side that may be holding water (under the floor which I cannot see)?  The source of the sinking was the exhaust valve on the starboard side located under the hanging locker.

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