Mysterious exhaust parts need to identify

[Sailmonkey]

Originally Posted by taz2

Thank you, can you give me a rough estimate of the materials I will need if I go your route please?

You’ll need a mixing elbow off of the back of the engine……could be purchased or made, cost roughly $300-$500

You’ll need any flavor of water lift muffler (centek/vernalift, vetus, etc…). Roughly $150-$600

Then comes the hose. Likely a section of corrugated for a sharp bend or two as well as lots of the normal stiff stuff. Cost depends on the length of run. Don’t go cheap on the clamps here, use awab or awa solid clamps.

[taz2]

Here's what I'm looking at although budget is very, very tight, see pictures attached.
What's missing apart from hose

[taz2]

Looking at the diagrams, this not a job I can do my self, plus the fact I don't have $1500 to spend, I'm going to have to look at cheaper option/s. Plus I'm not sure what I'm actually need!

I feel very deflated.

[Sailmonkey]

Originally Posted by taz2

Here's what I'm looking at although budget is very, very tight, see pictures attached.

What's missing apart from hose

You’re missing a waterlift muffler

You also need to determine how you’re going to attach the mixing elbow to the engine. Is there pipe thread on the manifold? Is it a flange?

[Sailmonkey]

Originally Posted by taz2

Looking at the diagrams, this not a job I can do my self, plus the fact I don't have $1500 to spend, I'm going to have to look at cheaper option/s. Plus I'm not sure what I'm actually need!

I feel very deflated.

If you can figure out how to unscrew the mixer from the annular hose/pipe, you can replace the rubber hose over the flex pipe. That should buy you some time to save up for the hardware needed to fix this properly.

The annular cooling scares the hell out of me, all it takes is the stainless flex hose to fail and the engine is filled with water after shutdown.

[Cheechako]

Originally Posted by taz2

How can I simplify the system?
Novice sailor/ novice mechanic

Just take the large silver muffler and the mystery small cylinder and all that garbage out, replace it with a proper fiberglass Waterlift Muffler system. Mount the muffler as low as possible below the engine exhaust point, have a loop near the hull exit that goes up high to avoid water ingress into your engine.
Where is your water mixing elbow? I think I see it in your last picture... the small hose coming into the exhaust pipe.It's likely on the aft part of the engine. Make sure it's not clogged.

[Sailmonkey]

Originally Posted by Cheechako

Just take the large silver muffler and the mystery small cylinder and all that garbage out, replace it with a proper fiberglass Waterlift Muffler system. Mount the muffler as low as possible below the engine exhaust point, have a loop near the hull exit that goes up high to avoid water ingress into your engine.
Where is your water mixing elbow? I think I see it in your last picture... the small hose coming into the exhaust pipe.It's likely on the aft part of the engine. Make sure it's not clogged.

The silver “muffler” is the mixing elbow. It’s dry exhaust up to that point

[Cheechako]

Originally Posted by Sailmonkey

The silver “muffler” is the mixing elbow. It’s dry exhaust up to that point

Weird, looks like a SS muffler to me. That hose on it looks awfully big...? So what is that in picture #1 then? Looks like a small hose going into the pipe...?

[sanibel sailor]

You can get a nice SS mixing elbow made for less than $100. I will post pics in next few days. Westerbeke prices are high.
Tight budget means DIY- no problem. Look at Calder's book Boatowner's Mechanical and Electrical Manual and Gerr's "Boat Mechanical Systems Handbook." You should own the first one.

That will be enough background to help start figuring this out.

[Sailmonkey]

Originally Posted by Cheechako

Weird, looks like a SS muffler to me. That hose on it looks awfully big...? So what is that in picture #1 then? Looks like a small hose going into the pipe...?

See post #2

Dry exhaust leaves the engine with a water jacket up to the stainless muffler thing.

[Cheechako]

Originally Posted by sanibel sailor

You can get a nice SS mixing elbow made for less than $100. I will post pics in next few days. Westerbeke prices are high.
Tight budget means DIY- no problem. Look at Calder's book Boatowner's Mechanical and Electrical Manual and Gerr's "Boat Mechanical Systems Handbook." You should own the first one.

That will be enough background to help start figuring this out.

Yep. On my first offshore cruiser the Volvo MD2B had a threaded outlet flange. I made a mixing elbow from a 2" galvanized nipple and 45 degree pipe elbow!

[skipperpete]

Originally Posted by taz2

Looking at the diagrams, this not a job I can do my self, plus the fact I don't have $1500 to spend, I'm going to have to look at cheaper option/s. Plus I'm not sure what I'm actually need!

I feel very deflated.

You can do this[emoji844] either the full conversion to a complete wet exhaust or just the replacement of the outer hose on your current dry pipe installation.
No matter what road you take, the addition of a vent loop is imperative as you demonstrated when you opened the seacock with the outer sleeve of the heat rejection section open as in the early pics and water rushed in, this can’t happen with a loop and siphon break and a failure of the convoluted hose would be a non threatening event which would cause raw water to join the dry exhaust gas and exit via the large, above waterline exhaust outlet.
I’ve been close up with the convoluted SSteel flex a lot and its damned good stuff in 316, inconel or Monel and it can take 20 bar easily. It shouldnt be affected by plain raw water.
The end cap with the water inlet should unscrew to allow the replacement of the outer shabby hose.
I still maintain that this is a completely dry exhaust from engine to hull outlet and the section in your pics just ahead of the SS cylinder is the heat extraction part.
Good luck with the job.

[skipperpete]

Here’s the flex SS pipe

[skipperpete]

Originally Posted by taz2

Looking at the diagrams, this not a job I can do my self, plus the fact I don't have $1500 to spend, I'm going to have to look at cheaper option/s. Plus I'm not sure what I'm actually need!

I feel very deflated.

I found a place in Gloucester Massachusetts that quite possibly made or supplied your existing exhaust system

[hpeer]

Originally Posted by sanibel sailor

You can get a nice SS mixing elbow made for less than $100. I will post pics in next few days. Westerbeke prices are high.
Tight budget means DIY- no problem. Look at Calder's book Boatowner's Mechanical and Electrical Manual and Gerr's "Boat Mechanical Systems Handbook." You should own the first one.

That will be enough background to help start figuring this out.

Both of my boats have custom SS waterlifts. It is a good and cost effective solution.

It just looks more difficult than it is.