Stus-List Re: Chuck's Exhaust Elbow

[Korbey Hunt via CnC-List]

What a tale of woe.  Replacement best.

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From: CHARLES SCHEAFFER via CnC-List 
Sent: Sunday, July 16, 2023 7:22:20 PM
To: Stus-List 
Cc: CHARLES SCHEAFFER 
Subject: Stus-List Re: Chuck's Exhaust Elbow

Hi David,

In my case, The exhaust was working fine, no leaks.  But I had to remove it to 
get the bell housing off to access the transmission bolts to remove the 
transmission which was slipping.  The transmission is being rebuilt by a pro.  
The exhaust riser had some questionable looking fittings that were original and 
I wanted to replace what I could while waiting for the transmission. The water 
injector elbow was a street elbow and missing some meat where the hose gets 
clamped on.  It should be a barb fitting and it must have been installed before 
the flange was screwed on, so the flange needed to be removed to remove the 
injector elbow.

I put it in a vice and soaked it in PB Blaster for a week, spraying the joints 
every day, and then tried a pipe wrench on the flange.  It turned easily but 
the 1 1/4" nipple sheared right off leaving some portion of threads inside the 
flange neck.  We had to cut the part of the nipple in the riser using a sawzall 
and chisel it in on itself making a spiral we turned using a couple large 
pliers.  We were going to do the same for the barb fitting but instead tried to 
heat the casting and use a pipe wrench to turn it.  Since we had three guys, 
one held the torch while I had the pipe wrench, and the third guy tapped the 
casting with a ballpeen hammer.  Before the barb fitting turned, the casting 
cracked where it was thinnest.  Oh shit.  The most experienced guy tried to 
braze the crack but it just opened up more and more.

Where the casting cracked was right below the hex molded into it.  We discussed 
our problem and re-evaluated what we did and methods used and all agreed we did 
things right.  The casting was paper thin at the crack and it was a blessing to 
find this now instead of it eroding through and failing at sea.  Or you could 
say I should have left it alone and not messed with it.  I could get a pipe 
nipple welded on the flange and I could fix the crack in the riser using an 
epoxy, but I chose to order new parts.  My Barr riser was aluminum and I found 
it available online.  The iron version is cheaper but out of stock.  A new 
flange costs about the same as what a welder would charge to add a nipple to 
the old one.  I looked at SS models but they look like they may not fit in my 
engine box, so I will replace with the same parts and the new exhaust should 
last longer than the engine.


Chuck




On 07/16/2023 9:01 PM EDT David Knecht via CnC-List  
wrote:


Hi chuck. What made you decide to replace it?  Problems or trying to prevent 
them?  Dave

Sent from my iPhone

Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List Re: Chuck's Exhaust Elbow

[CHARLES SCHEAFFER via CnC-List]

Hi David,
 
In my case, The exhaust was working fine, no leaks.  But I had to remove it to 
get the bell housing off to access the transmission bolts to remove the 
transmission which was slipping.  The transmission is being rebuilt by a pro.  
The exhaust riser had some questionable looking fittings that were original and 
I wanted to replace what I could while waiting for the transmission. The water 
injector elbow was a street elbow and missing some meat where the hose gets 
clamped on.  It should be a barb fitting and it must have been installed before 
the flange was screwed on, so the flange needed to be removed to remove the 
injector elbow.
 
I put it in a vice and soaked it in PB Blaster for a week, spraying the joints 
every day, and then tried a pipe wrench on the flange.  It turned easily but 
the 1 1/4" nipple sheared right off leaving some portion of threads inside the 
flange neck.  We had to cut the part of the nipple in the riser using a sawzall 
and chisel it in on itself making a spiral we turned using a couple large 
pliers.  We were going to do the same for the barb fitting but instead tried to 
heat the casting and use a pipe wrench to turn it.  Since we had three guys, 
one held the torch while I had the pipe wrench, and the third guy tapped the 
casting with a ballpeen hammer.  Before the barb fitting turned, the casting 
cracked where it was thinnest.  Oh shit.  The most experienced guy tried to 
braze the crack but it just opened up more and more. 
 
Where the casting cracked was right below the hex molded into it.  We discussed 
our problem and re-evaluated what we did and methods used and all agreed we did 
things right.  The casting was paper thin at the crack and it was a blessing to 
find this now instead of it eroding through and failing at sea.  Or you could 
say I should have left it alone and not messed with it.  I could get a pipe 
nipple welded on the flange and I could fix the crack in the riser using an 
epoxy, but I chose to order new parts.  My Barr riser was aluminum and I found 
it available online.  The iron version is cheaper but out of stock.  A new 
flange costs about the same as what a welder would charge to add a nipple to 
the old one.  I looked at SS models but they look like they may not fit in my 
engine box, so I will replace with the same parts and the new exhaust should 
last longer than the engine.
 
 
Chuck
 
 
 
  

> On 07/16/2023 9:01 PM EDT David Knecht via CnC-List  
> wrote:
>  
>  
> Hi chuck. What made you decide to replace it?  Problems or trying to prevent 
> them?  Dave
> 
> Sent from my iPhone
>  
> 
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List Re: C Yanmar 3GM 20hp Exhaust Elbow

[ALAN BERGEN via CnC-List]

I replaced mine after discovering a pinhole in the mixing elbow. It was
corroded so badly that I couldn't remove it from the piece it was attached
to, even heating it with a torch and using a five foot piece of pipe on a
wrench for leverage. I removed both pieces together (easy) and replaced
them with cast iron items. I was able to salvage the nipple.

Alan Bergen
35 Mk III Thirsty
Rose City YC
Portland, OR



On Sun, Jul 16, 2023 at 4:13 PM Jeffrey A. Laman via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hello Yanmar 3GM owners,
> I need to replace the U-type mixing elbow and exhaust elbow assembly on my
> 3GM 20hp.  If this topic has been discussed here previously, my apologies
> -- I attempted a search of the archives but not sure I am conducting the
> search correctly.
> There seems to be debate about stainless steel vs cast iron and welded SS
> vs cast SS.  There is a complete SS kit at
> https://hdimarine.net/product/gm-kit/
> 
> that appears to be high quality and reasonably priced (for a boat
> part...).  I will be grateful for any advice on source for the exhaust
> elbow/mixing elbow and cast iron vs SS vs cast SS.  Also, advice regarding
> the replacement job as I will do this myself.  Thanks.
> Jeff Laman
> 1981 C Harmony
> Ludington, MI
> Please show your appreciation for this list and the Photo Album site and
> help me pay the associated bills.  Make a contribution at:
>
> https://urldefense.com/v3/__https://www.paypal.me/stumurray__;!!LIr3w8kk_Xxm!ozyK7o3KtYwEX5DYMyeNOi03rZ8K94METHx-eq1MMy9vqY9QMFAnou7HaYgwebF2OFscw-pgKtCsJwbr2EdZUJA$
> Thanks for your help.
> Stu
>
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List Re: C Yanmar 3GM 20hp Exhaust Elbow

[Jeffrey A. Laman via CnC-List]

Chuck can respond for his situation, but in my case, 10 yrs ago the exhaust 
elbow came apart while previous owner was motoring out of marina. I happened to 
be crew at the time. Big mess. PO had a plumber friend fabricate a replacement 
exhaust elbow and mixer out of regular pipe I assume. That's what I now have 
and it needs to finally be replaced before I start more extensive cruising next 
summer. Plus, I suspect the exhaust may be getting clogged.
Jeff Laman

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From: David Knecht via CnC-List 
Sent: Sunday, July 16, 2023 9:01:42 PM
To: Stus-List 
Cc: davidakne...@gmail.com 
Subject: Stus-List Re: C Yanmar 3GM 20hp Exhaust Elbow

Hi chuck. What made you decide to replace it?  Problems or trying to prevent 
them?  Dave

Sent from my iPhone

On Jul 16, 2023, at 7:53 PM, CHARLES SCHEAFFER via CnC-List 
 wrote:


That SS kit looks really nice if it matches your engine.

FWIW, it wouldn't match my Universal M4-30.  So I'm replacing the exhaust riser 
mixing elbow with the same thing that lasted for 34 years.  It has an iron 3 
bolt flange at the engine, iron pipe nipples and aluminum casting for the elbow 
made by Barr.  It's much more compact than a SS aftermarket elbow would be.  
Parts should arrive in a few days.  I may get some SS nipples for it, if 
they're not too pricey.

Chuck Scheaffer, Resolute 1989 C 34R, Annapolis
On 07/16/2023 7:12 PM EDT Jeffrey A. Laman via CnC-List  
wrote:


Hello Yanmar 3GM owners,
I need to replace the U-type mixing elbow and exhaust elbow assembly on my 3GM 
20hp.  If this topic has been discussed here previously, my apologies -- I 
attempted a search of the archives but not sure I am conducting the search 
correctly.
There seems to be debate about stainless steel vs cast iron and welded SS vs 
cast SS.  There is a complete SS kit at https://hdimarine.net/product/gm-kit/ 
that appears to be high quality and reasonably priced (for a boat part...).  I 
will be grateful for any advice on source for the exhaust elbow/mixing elbow 
and cast iron vs SS vs cast SS.  Also, advice regarding the replacement job as 
I will do this myself.  Thanks.
Jeff Laman
1981 C Harmony
Ludington, MI
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills. Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List Re: C Yanmar 3GM 20hp Exhaust Elbow

[David Knecht via CnC-List]

Hi chuck. What made you decide to replace it?  Problems or trying to prevent 
them?  Dave

Sent from my iPhone

> On Jul 16, 2023, at 7:53 PM, CHARLES SCHEAFFER via CnC-List 
>  wrote:
> 
> 
> That SS kit looks really nice if it matches your engine. 
>  
> FWIW, it wouldn't match my Universal M4-30.  So I'm replacing the exhaust 
> riser mixing elbow with the same thing that lasted for 34 years.  It has an 
> iron 3 bolt flange at the engine, iron pipe nipples and aluminum casting for 
> the elbow made by Barr.  It's much more compact than a SS aftermarket elbow 
> would be.  Parts should arrive in a few days.  I may get some SS nipples for 
> it, if they're not too pricey.
>  
> Chuck Scheaffer, Resolute 1989 C 34R, Annapolis
>> On 07/16/2023 7:12 PM EDT Jeffrey A. Laman via CnC-List 
>>  wrote:
>>  
>>  
>> Hello Yanmar 3GM owners,
>> I need to replace the U-type mixing elbow and exhaust elbow assembly on my 
>> 3GM 20hp.  If this topic has been discussed here previously, my apologies -- 
>> I attempted a search of the archives but not sure I am conducting the search 
>> correctly.
>> There seems to be debate about stainless steel vs cast iron and welded SS vs 
>> cast SS.  There is a complete SS kit at 
>> https://hdimarine.net/product/gm-kit/ that appears to be high quality and 
>> reasonably priced (for a boat part...).  I will be grateful for any advice 
>> on source for the exhaust elbow/mixing elbow and cast iron vs SS vs cast SS. 
>>  Also, advice regarding the replacement job as I will do this myself.  
>> Thanks.
>> Jeff Laman
>> 1981 C Harmony
>> Ludington, MI
>> Please show your appreciation for this list and the Photo Album site and 
>> help me pay the associated bills. Make a contribution at: 
>> https://www.paypal.me/stumurray 
>> Thanks for your help. 
>> Stu
> Please show your appreciation for this list and the Photo Album site and help 
> me pay the associated bills.  Make a contribution at:
> https://www.paypal.me/stumurray
> Thanks for your help.
> Stu
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List Re: C Yanmar 3GM 20hp Exhaust Elbow

[CHARLES SCHEAFFER via CnC-List]

That SS kit looks really nice if it matches your engine. 
 
FWIW, it wouldn't match my Universal M4-30.  So I'm replacing the exhaust riser 
mixing elbow with the same thing that lasted for 34 years.  It has an iron 3 
bolt flange at the engine, iron pipe nipples and aluminum casting for the elbow 
made by Barr.  It's much more compact than a SS aftermarket elbow would be.  
Parts should arrive in a few days.  I may get some SS nipples for it, if 
they're not too pricey.
 
Chuck Scheaffer, Resolute 1989 C 34R, Annapolis

> On 07/16/2023 7:12 PM EDT Jeffrey A. Laman via CnC-List 
>  wrote:
>  
>  
> Hello Yanmar 3GM owners,
> I need to replace the U-type mixing elbow and exhaust elbow assembly on my 
> 3GM 20hp.  If this topic has been discussed here previously, my apologies -- 
> I attempted a search of the archives but not sure I am conducting the search 
> correctly.
> There seems to be debate about stainless steel vs cast iron and welded SS vs 
> cast SS.  There is a complete SS kit at https://hdimarine.net/product/gm-kit/ 
> that appears to be high quality and reasonably priced (for a boat part...).  
> I will be grateful for any advice on source for the exhaust elbow/mixing 
> elbow and cast iron vs SS vs cast SS.  Also, advice regarding the replacement 
> job as I will do this myself.  Thanks.
> Jeff Laman
> 1981 C Harmony
> Ludington, MI
> Please show your appreciation for this list and the Photo Album site and help 
> me pay the associated bills. Make a contribution at:
> https://www.paypal.me/stumurray
> Thanks for your help.
> Stu
> 
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

Stus-List C Yanmar 3GM 20hp Exhaust Elbow

[Jeffrey A. Laman via CnC-List]

Hello Yanmar 3GM owners,
I need to replace the U-type mixing elbow and exhaust elbow assembly on my 3GM 
20hp.  If this topic has been discussed here previously, my apologies -- I 
attempted a search of the archives but not sure I am conducting the search 
correctly.
There seems to be debate about stainless steel vs cast iron and welded SS vs 
cast SS.  There is a complete SS kit at https://hdimarine.net/product/gm-kit/ 
that appears to be high quality and reasonably priced (for a boat part...).  I 
will be grateful for any advice on source for the exhaust elbow/mixing elbow 
and cast iron vs SS vs cast SS.  Also, advice regarding the replacement job as 
I will do this myself.  Thanks.
Jeff Laman
1981 C Harmony
Ludington, MI
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu