IT'S ALWAYS SOMETHING - AIN'T THAT THE TRUTH (HUGE QUESTION)

[twodzusfittings]

Please note, I found this diagram on the web. It gives the basic idea of how my set up is. My engine is a Universal M20.
This winter spring I changed out my cutlass bearing. So in order not to mess up the transmission I needed to do a re alignment. Well I found that my engine mounts were bad so I ordered replacements and ventured into switching them out. One of the important steps is to remove the connecting parts for the exhaust so the engine can be lifted. In doing so the pipe with the line entering that brings water to the exhaust just fell apart from rust and corrosion.
My question to those that have a similar set up is "why can't the raw water that mixes in the pipe not be sent straight to the Vetus box. This would eliminate the manufacturing of a connection. Would this work and maybe someone can explain why or why not. Thanks in advance.

 

[Davidasailor26]

The water needs to cool the exhaust gasses before they enter the plastic muffler. If the gasses weren’t cooled by the water before the muffler it would melt. You would also need solid metal pipe all the way to the muffler, which would be difficult with a vibrating engine and fixed muffler.

 

[twodzusfittings]

makes sense.

 

[Richard19068]

I know this doesn't help but you might consider yourself lucky. If that connection breaks while you are motoring at sea you are not only stuck but you have a heck of a mess to clean up after the raw (in my case salt) water has sprayed all over your engine compartment.

 

[twodzusfittings]

@Richard19068 and for others. I agree. Initially I was a little miffed, but as I thought about it, I'm glad it broke at the dock. So I was not able to remove the old pipe off the manifold connector, (corroded together I'm sure), so I found a new one, original part. I also found an exhaust mixing elbow. The elbow is actually for a Westebeke. I dont know what the original Universal looked like as I cannot find any pictures for one, but with the correct piping, I should be able to put it all back together as soon as it arrives.

I'll need fresh steel piping, elbows and a brass barbed/ threaded connector (for the water). It's recommended not to use galvanized. This should last a while.

 

[eherlihy]

I just went through this with a client of mine, on his O'day 35. I initially wanted to use an Onan mixing elbow (which looks EXACTLY like the Westerbeake above, except either white or unpainted), but could not find one. A local diesel shop had a Universal exhaust nipple (not an elbow) with water injection on hand, and it was (relatively) cheap - >$120. I have since found the part on-line - Part Number 299693 (at considerably less $$). Add a 90º elbow, and you have the same thing!

The threaded metal fittings for the exhaust are 1¼", the rubber exhaust hose is 1-5/8", and the water inlet is ½".

 

[twodzusfittings]

Thats exactly what corroded off except both ends were threaded. Wow way cheaper. Oh well, knowledge for the next time.

 

[eherlihy]

The Westerbeake part (number 033067?) is, IMHO, a more robust solution. It is thickly cast and intended as a mixing elbow. The Universal Part Number 299693 is a piece of pipe, with a hole, and another pipe welded to it. It will corrode in >15 years (possibly >10), but it is CHEAP!

 

[eherlihy]

This is becoming an obsession with me...
I BELIEVE that the fitting dimensions for the Westerbeake 033067 are: 1½" NPSF Exhaust In, 3/8" NPSF Water In, 2" HOSE Exhaust & Water OUT.
I BELIEVE that the fitting dimensions for the Onan 155-1058 are: 1¼" NPSF Exhaust In, 3/8" NPSF Water In, 1-3/4" HOSE Exhaust & Water OUT.

I KNOW that the fitting dimensions for the Universal 299693 are: 1¼" NPSF Exhaust In, ½" HOSE Water In, 1-5/8" Hose Exhaust & Water Out.

PLEASE CORRECT ME IF I AM WRONG!

You will NEED to know the fitting and hose sizes or you will loose your mind trying to make them fit.

My boat has the Onan 155-1058 mixing elbow pictured above. It also has a sleeve of rubber hose on the waterlift muffler. I believe that sleeve (and the two hose clamps) is to adapt the 1-3/4" hose to the 1-1/2" hose fitting on my Vetus WLOCK40R (40MM =~1½" inlet and outlet) muffler.

 

[twodzusfittings]

look what arrived today

 

[eherlihy]

In the picture, it looks as though the Westerbeake mixing elbow has a reducing coupling and a 1½ nipple in front of it. If so, this confirms my suspicion about the fitting sizes.

 

[twodzusfittings]

Correct you are. Threaded exhaust in is 2". Exhaust/Water out is 2". Water inlet is 1/2 NPT. All put back, works great. Thanks to all those that helped.

 

[RoyS]

Wrap the pipe before the water injection to prevent it from melting any wires or hoses that may touch it. That part of the pipe will get extremely hot.

 

[eherlihy]

Correct you are. Threaded exhaust in is 2". Exhaust/Water out is 2". Water inlet is 1/2 NPT. All put back, works great. Thanks to all those that helped.

So, to be clear; Westerbeake 033067 fittings are: 2" NPSF Exhaust In, 1/2" NPTF Water In, 2" HOSE Exhaust & Water OUT

 

[twodzusfittings]

I don't know what SF and TF mean but the sizes are correct. Thats what I took off the shelf and fitted the Exhaust Elbow. The Brass water piece said 1/2x1/2

 

[eherlihy]

Free Education:
(American) National Pipe (thread) Straight Female
(American) National Pipe (thread) Tapered Female

 

[twodzusfittings]

Excellent. I learn something everyday. It pays to remain teachable!

 

[Serenity on Hudson]

If you haven't learned something new today, check the obituaries.

 

[twodzusfittings]

If you haven't learned something new today, check the obituaries.

Education on that quote is required please?