Thanks for your help.
I'm turning it into a picnic boat in New England so no off season use.
Moving it to wet exhuast as the women in spaghetti strap cocktail dresses
don't want cinders in their Cosmopolitans as they lounge in the aft deck.

I've seen some water lift mufflers at www.marineexhaust.com. , but this is a
420 hp engine.
Can you give a brief explanation of Injection Elbow, Vacum Breaker, and wet
loop?

This is alow slung engine.
Mounted 3 cylinders in the cabin, 3 in the wheelhouse.


"Dave W" wrote in message
...
This can certainly be done, but why? Dry exhaust has some real
advantages,
especially in winter operation; exhaust system cannot freeze.
Additionally,
you eliminate the water injection elbow which is an achillies heel of
diesels. With a suitable muffler the sound of a dry exhaust is sweet.
Just
stay away from the hot pipe!.
To replace, you will need a water lift muffler, injection elbow and
associated piping, rubber hose, vacuum breaker and through transom
fittings.
Have a look at the waterlift muffler manufacturers pages to learn about
height requirements. The height of the wet elbow above the muffler and
the
height of the wet loop above the waterline are critical requirements.
These
are not easily met in lots of lobster boats because of the need for a
level
working deck.
"Jim and Becky" wrote in message
...
I'm considering the purchase of a 32 foot lobster boat. It has a Cat
straight 6 diesel with a dry exhaust.
Does anyone have experience in changing this set up over to a through
transom wet exhaust?
I'm concerned about the height of the pipe relative to the waterline and
possible intrusion into the engine.

Get a copy of "Boatowner's Mechanical & Electrical Manual: How to Maintain,
Repair, and Improve Your Boat's Essential Systems" by Nigel Calder. He does
a great job of explaining with illustrations and alternatives; e.g. instead
of a vacuum breaker he likes a small tubing venting into the cockpit. If it
isn't wet, shut off the engine.

Roger

http://home.insightbb.com/~derbyrm

"Jim and Becky" wrote in message
...

I've seen some water lift mufflers at www.marineexhaust.com. , but this is
a 420 hp engine.
Can you give a brief explanation of Injection Elbow, Vacum Breaker, and
wet
loop?