Empathy List Archives

CR

Christopher Ruby

Sun, Jan 30, 2005 6:43 PM

Hi Folks:

We just bought a 1987 DeFever 53 MY and are now involved with the refit
process. The exhaust elbows are both pitted and need to be replaced. Would
this be a Caterpillar part or are these custom made for each boat? Any idea
of where I might get a set of these in the St. Petersburg, Florida area?

I'm guessing that the 6 inch exhaust hose is also original and will also need
to be replaced. The $32 to $37 per foot at West or Defender seems pretty
steep, anyone know of an alternate supplier of these marine exhaust hoses?

And finally, I'd like to put a set of mufflers on these Cat 3208TA's (375 hp).
The manual seems to indicate that the turbo 3208's came without mufflers dues
to back pressure considerations. Does anyone see any problem with adding a
set of 'torpedo-shaped" mufflers? I'm an 8-10 knot guy and don't use much of
the 375 hp anyway.

Thanks in advance,

Chris Ruby
DeFever 53 POC
Bella Luna

Hi Folks: We just bought a 1987 DeFever 53 MY and are now involved with the refit process. The exhaust elbows are both pitted and need to be replaced. Would this be a Caterpillar part or are these custom made for each boat? Any idea of where I might get a set of these in the St. Petersburg, Florida area? I'm guessing that the 6 inch exhaust hose is also original and will also need to be replaced. The $32 to $37 per foot at West or Defender seems pretty steep, anyone know of an alternate supplier of these marine exhaust hoses? And finally, I'd like to put a set of mufflers on these Cat 3208TA's (375 hp). The manual seems to indicate that the turbo 3208's came without mufflers dues to back pressure considerations. Does anyone see any problem with adding a set of 'torpedo-shaped" mufflers? I'm an 8-10 knot guy and don't use much of the 375 hp anyway. Thanks in advance, Chris Ruby DeFever 53 POC Bella Luna

PJ

Philip J. Rosch

Sun, Jan 30, 2005 6:58 PM

My hoses are 26 years old on my Lehmans and on my "honey-do list". My plan
is to look into spun fiberglass hose or possibly PVC for the long runs to
minimize the cost.

                                      Regards....

Phil Rosch
Old Harbor Consulting
M/V Curmudgeon MT-44TC
Currently at Manatee Pocket, Stuart, FL.

My hoses are 26 years old on my Lehmans and on my "honey-do list". My plan is to look into spun fiberglass hose or possibly PVC for the long runs to minimize the cost. Regards.... Phil Rosch Old Harbor Consulting M/V Curmudgeon MT-44TC Currently at Manatee Pocket, Stuart, FL.

AJ

Arild Jensen

Sun, Jan 30, 2005 7:12 PM

Someone mentioned a new 52 foot trawler (Nordic Tug I think) and when
looking at the drawing it looked to me like they had adopted an
underwater midships location for the exhaust.

This is consistent with what the larger yachts are doing.
A small bypass tube leads aft to exist above the waterline for when the
boat is idling at rest.
When the boat has forward motion, the midships underwater exhausts
extract all of the exhaust gasses. To assist in this process s fairing
shape is molded into the hull around the exit. This creates a partial
vacuum at speed to assist in extracting the gasses.
The advantage of such a system is that you do not have large pipes
running the length of the hull and he total exhaust line has less
resistance.
The underwater exhaust is very quiet.
Combined with the idea of a sea chest or stand pipe water intake it
greatly reduces the inside hull piping space required.

Has anyone seen the 52 Nordic tug and can they confirm this is what is
designed as opposed to implied by the drawings.

Arild

Someone mentioned a new 52 foot trawler (Nordic Tug I think) and when looking at the drawing it looked to me like they had adopted an underwater midships location for the exhaust. This is consistent with what the larger yachts are doing. A small bypass tube leads aft to exist above the waterline for when the boat is idling at rest. When the boat has forward motion, the midships underwater exhausts extract all of the exhaust gasses. To assist in this process s fairing shape is molded into the hull around the exit. This creates a partial vacuum at speed to assist in extracting the gasses. The advantage of such a system is that you do not have large pipes running the length of the hull and he total exhaust line has less resistance. The underwater exhaust is very quiet. Combined with the idea of a sea chest or stand pipe water intake it greatly reduces the inside hull piping space required. Has anyone seen the 52 Nordic tug and can they confirm this is what is designed as opposed to implied by the drawings. Arild

GB

Geo. Brooks, N7HPE

Sun, Jan 30, 2005 11:06 PM

Chris,

I replaced the Caterpillar exhaust elbows on my 3208 naturally aspirated
engines with custom units made by National Marine Exhaust.

http://www.nationalmarineexhaust.com/

They designed the elbows so they are very tall and are unjacketed until
after the "U" bend at the top to reduce the probability of a failure
allowing salt water to get back into the cylinders. The unjacketed portion
is wrapped with high temperature insulation.

Regards,

George Brooks
45' CHB
Nereid V
La Conner, WA

process. The exhaust elbows are both pitted and need to be replaced.
Would
this be a Caterpillar part or are these custom made for each boat? Any
idea
of where I might get a set of these in the St. Petersburg, Florida area?

Chris, I replaced the Caterpillar exhaust elbows on my 3208 naturally aspirated engines with custom units made by National Marine Exhaust. http://www.nationalmarineexhaust.com/ They designed the elbows so they are very tall and are unjacketed until after the "U" bend at the top to reduce the probability of a failure allowing salt water to get back into the cylinders. The unjacketed portion is wrapped with high temperature insulation. Regards, George Brooks 45' CHB Nereid V La Conner, WA > process. The exhaust elbows are both pitted and need to be replaced. > Would > this be a Caterpillar part or are these custom made for each boat? Any > idea > of where I might get a set of these in the St. Petersburg, Florida area?

CC

Charles Culotta

Mon, Jan 31, 2005 4:42 PM

My hoses are 26 years old on my Lehmans and on my "honey-do list". My
plan
is to look into spun fiberglass hose or possibly PVC for the long runs to
minimize the cost.

Phil Rosch

Phil,
I'd be skeptical about PVC. Schedule 40 PVC begins to deform by 180deg F.
Regards,
Randy Pickelmann

Randy,et al,

Below is a post that I did several yrs ago.

CCC
+++
Check the muffler. I had one quit

600+ miles fr home. I repaired it using a length of plastic sewer pipe
and some hose clamps.
I by passed the muffler with the pipe, real easy. No the pipe will not
get too hot, if it does you have another problem to remedy. This lasted
until we got home.
That was on a friends boat , on CCRIDER a diff prob. the hose to the
muff is 3 inch diameter and the hose fr it to the transom is 3.5 inches.
Cant
make the transition in plastic.Soo
I got two pieces of aluminum tubing and had them welded together, viola
a MUFFLER EXCLUDER DEVICE as opposed to a Turtle Excluder Device.
When I recently had a muffler out for fuel tank repairs I tried it for
fit and it does work.
My son remembered the incident and my plastic repair. So while at the US
Coast Guard Acad. on a weekend sail their exhaust line failed and he did
that same repair, To the bewilderment of the Cadre. It worked!

> My hoses are 26 years old on my Lehmans and on my "honey-do list". My > plan > is to look into spun fiberglass hose or possibly PVC for the long runs to > minimize the cost. > > Phil Rosch > Phil, I'd be skeptical about PVC. Schedule 40 PVC begins to deform by 180deg F. Regards, Randy Pickelmann Randy,et al, Below is a post that I did several yrs ago. CCC +++ Check the muffler. I had one quit > 600+ miles fr home. I repaired it using a length of plastic sewer pipe > and some hose clamps. > I by passed the muffler with the pipe, real easy. No the pipe will not > get too hot, if it does you have another problem to remedy. This lasted > until we got home. > That was on a friends boat , on CCRIDER a diff prob. the hose to the > muff is 3 inch diameter and the hose fr it to the transom is 3.5 inches. > Cant > make the transition in plastic.Soo > I got two pieces of aluminum tubing and had them welded together, viola > a MUFFLER EXCLUDER DEVICE as opposed to a Turtle Excluder Device. > When I recently had a muffler out for fuel tank repairs I tried it for > fit and it does work. > My son remembered the incident and my plastic repair. So while at the US > Coast Guard Acad. on a weekend sail their exhaust line failed and he did > that same repair, To the bewilderment of the Cadre. It worked!

trawlers@lists.trawlering.com

Exhaust Hose and elbow for a Cat 3208