Date: 13 November 2015. Welding Shop
and a Riser.
busy of late. As every boat owner knows there are always projects.
Seaweed is over thirty years old. She has had more than her share of
issues. The engine swaps (three engines in two years) has tested my
patience, my happiness quotient and my sense of humor. Having a boat
that cannot run is disheartening. Things are looking up and some
progress is being made.
hurricane season having a broken engine is more than a small worry. I was
fortunate this year. That is not to say I didn't worry myself sick
at times. Seaweed is my home and when she's not mobile, I am not
Plus too, I love to go swimming. There's something about anchoring
in four feet of water and playing around in the water. Skipper gets
to hang out on the swim platform. Sometimes she comes in with me. My
First Mate likes both!
As described in the
Cooling System of a Tractor
article, I've got a lot going on in the newest engine's
Originally I did not have a heat exchanger and
this stainless manifold was designed and made for me.
Tallahassee Welding and
Machine Shop in Tallahassee, FL.
Let me explain what you're
First of all, there's a heavy duty big stainless box that
surrounds the pipes. Those pipes (RED
ARROWS as seen above) carry the exhaust from the
engine. Fluid, a combination of anti-freeze and fresh water,
will fill said box. The solution will flow in from the bottom
left corner and exit the top right. That water/anti-freeze
concoction will go into (and come out of) a separate tank.
A sturdy stainless box encloses the Schedule 40 (heavy, thick
walled stainless) 1.5" pipe. The
STAINLESS PIPE carries hot exhaust air through the
cooling manifold box. A NIPPLE at
the top will deliver raw water into the pipe. That will further cool the
GREEN ARROWS AND STARS
show water and antifreeze as they flow through the stainless
box. There will be an external closed fresh water tank. That
unit is a Heat Exchanger.
After the addition of a real heat
exchanger into the system (thank you Steve) the stainless box
essentially became redundant. It had become a stainless cooling
manifold. The cooling will be handled by the heat exchanger.
I still needed to cool the exhaust
gases. Single purpose risers have been on boats for decades
performing just that task.
Todd in the office at Lizotte's
Welding [phone: 727-343-7690] in St. Pete, FL
That is where Lizotte's Welding in St. Pete, FL came into play. I
took by my stainless manifold and spoke with Todd. I wanted a riser.
Inside that stainless box is my riser. We've just got to get to it,
and Todd's shop will do that for me.
A riser is an important part of the cooling system
for your motor. What happens is this: as your motor runs the
exhaust gases inside get hot. Very, very
HOT. Cars are the same and you know how hot your
tailpipe can get!
On a boat we have
something called a Riser. It is essentially a U-shaped pipe
that the exhaust gases flow through, similar to your
Seawater is injected into
the pipe after the hump. Placement is such that no salt
water can flow back into your engine. The exhaust pipe aka riser has a nipple.
from outside the boat enters the pipe just past the hump. The job of the
raw water is to cool.
Note: on some risers
the raw water completely encases the exhaust pipe. They are
called water-jacketed. Water-jacketed risers will cool the
exhaust just like mine does.
is attached via hose clamps to a special (read "expensive")
wire reinforced exhaust hose. After the riser my hose runs
through a water muffler. From there another piece of exhaust
hose is plumbed to exit the boat.
That is why you always see water coming out the
exhaust pipes on boats. Outboards are the same. The water is a
crucial part of the cooling the system.
Smart mariners always check
their exhaust on start-up.
If no water is exiting, they immediately shut down
the motor and find out why!
I needed a riser for Betsy, my
Kubota 18hp engine. A few days after dropping off my stainless
manifold (see photo above) Todd phoned. My riser was ready. The
stainless surrounding it had been removed.
I was charged for one hour.
I was happy to confirm the welds on the inside of the stainless
manifold were a-okay.
Todd's shop (Lizotte's
Welding) removed the exterior box. Another nice thing Lizotte did
for me was mark where that smaller raw water pipe ends. It extends
past the hump so there's no danger of water back-flowing into my
I already knew exactly where
the nipple/pipe ended. That's because I have this nifty tool
USB Snake Inspection Camera.
A borescope is a cable about the size of 10 gauge wire with a
small camera and lights at one end.
The camera part is 1/2" wide and about 2" long. There are six
LEDs surrounding the camera. They are adjustable from Off to
Bright. You plug into a USB port on your computer and voila:
instant movie camera.
I loved that I could see what
was on the inside of the stainless manifold prior to taking it
to the welder. Because of the borescope I knew exactly where
the water entered the exhaust pipe to cool off the gas too.
borescope is an interesting tool. A friend uses one to
check his prop for barnacle growth. It's waterproof.
Like many boaters, I have a thing for tools. My friend Doug once
"My wife says I
claim to be messing with boats but that
what I am really doing is collecting tools." Douglas Pollard.
is quite long so attaching the raw water hose to it will be a
breeze. This should cool my exhaust gases with ease. It's not the
Whole Picture though.
The saga continues. More upcoming when the process is completed. And
that should be relatively soon. Knock teak.
I'd love to know if you've got your pipes wrapped.
And, did you use the same stuff or something else entirely?
In the Bilges,
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