Re: Stus-List Antifreeze leak

[Josh Muckley via CnC-List]

A leak at the heat exchanger was exactly what I suspected.  The heat
exchanger ends should come off easily with 4 nuts/bolts on each end.  The
tube bundle and deflector plates should just slide out.  If even just the
o-ring has gone bad you can get coolant leaking into the raw water.  You'd
ever see the leak.  A coolant system pressure check might prove/disprove
that a leak exsists

Josh Muckley
S/V Sea Hawk
1989 C 37 +
Solomons, MD


On Fri, Apr 5, 2019, 12:44 PM Jerome Tauber via CnC-List <
cnc-list@cnc-list.com> wrote:

> Had same Problem on Beneteau 411 and indeed there was a hole in the heat
> exchanger so antifreeze got pumped out with raw water.  Jerry
>
> Sent from my iPhone
>
> On Apr 5, 2019, at 11:48 AM, Gary Russell via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> You can't rule out a head gasket, either.  Look for a milky substance in
> the engine oil.
> Gary
> S/V Kaylarah
> '90 C 37+
> East Greenwich, RI, USA
> ~~~_/)~~
>
>
>
> On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Over a period of time, I'm losing antifreeze from the engine. I haven't
>> seen any leaks coming from any of the hoses or hose connections while the
>> engine is running. Can anyone confirm that the likely cause is a leak in
>> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
>> is it to replace/repair the heat exchanger core?
>>
>> Alan Bergen
>> 35 Mk III Thirsty
>> Rose City YC
>> Portland, OR
>> ___
>>
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Stus-List Antifreeze leak

[robert via CnC-List]

Alan,

A few seasons back, after motoring back home, I noticed antifreeze 
underneath the my engine (Yanmar 2GMF).   What I eventually discovered 
was that one of the 'bled or drain screws' had loosened just enough to 
cause a small leak.  On my engine, there are, I think, 3 outlets which 
have 'T shaped' taps which you open to drain the antifreeze, 2 for the 
engine and 1 for the heat ex changer, all on the starboard side of the 
engine.  There are small clear hoses, maybe 1/4", attached to each 
making it easy to drain into a container when each is opened.


Don't know if you have the same but worth a look.all I did was 
tighten them (the 1 from the heat exchanger) was the one loose, problem 
solved.


Rob Abbott
AZURA
C 32 - #277
Halifax, N.S.

On 2019-04-05 12:45 p.m., ALAN BERGEN via CnC-List wrote:
Over a period of time, I'm losing antifreeze from the engine. I 
haven't seen any leaks coming from any of the hoses or hose 
connections while the engine is running. Can anyone confirm that the 
likely cause is a leak in the heat exchanger? The engine is a Yanmar 
3GMf, 20hp model. How difficult is it to replace/repair the heat 
exchanger core?


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




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Re: Stus-List Antifreeze leak

[bwhitmore via CnC-List]

Hi Alan,Nevermind, I saw in one of your posts that you have a Yanmar.  Sorry to 
ask something you already answered,Bruce Sent from Samsung tablet.
 Original message From: bwhitmore via CnC-List 
 Date: 4/6/19  8:57 AM  (GMT-05:00) To: 
cnc-list@cnc-list.com Cc: bwhitmore  Subject: Re: 
Stus-List Antifreeze leak By the way, what kind of engine do you have?  The 
reason I ask is that a friend of mine had a Westerbeke, and it turns out there 
is a guy who fixes Westerbeke heat exchangers a lot less expensively than 
buying new ones.  Westerbekes have zincs.  He too was losing antifreeze out the 
exhaust any time the engine was running.Yanmars, by comparison don't have 
zincs.I am still trying to track down what might be a slow leak of antifreeze.  
I've put dye in my overflow tank and have yet to find any on the outside of the 
engine using a blacklight.  That said, the loss of coolant has slowed down, and 
I'm thinking I may have simply failed to get all the air out of the system when 
I changed antifreeze (fingers crossed!).Bruce Whitmore 1994 C 
37/40+"Astralis"Madeira Beach, FLSent from Samsung tablet.___

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Re: Stus-List Antifreeze leak

[bwhitmore via CnC-List]

By the way, what kind of engine do you have?  The reason I ask is that a friend 
of mine had a Westerbeke, and it turns out there is a guy who fixes Westerbeke 
heat exchangers a lot less expensively than buying new ones.  Westerbekes have 
zincs.  He too was losing antifreeze out the exhaust any time the engine was 
running.Yanmars, by comparison don't have zincs.I am still trying to track down 
what might be a slow leak of antifreeze.  I've put dye in my overflow tank and 
have yet to find any on the outside of the engine using a blacklight.  That 
said, the loss of coolant has slowed down, and I'm thinking I may have simply 
failed to get all the air out of the system when I changed antifreeze (fingers 
crossed!).Bruce Whitmore 1994 C 37/40+"Astralis"Madeira Beach, FLSent from 
Samsung tablet.
null___

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Re: Stus-List Antifreeze leak

[Josh Muckley via CnC-List]

Double check the manual, for some reason I seem to think it is a 10 psi
cap.  Other than that it is the same as any other automotive cap.

Josh Muckley
S/V Sea Hawk
1989 C 37+
Solomons, MD

On Fri, Apr 5, 2019, 4:51 PM ALAN BERGEN via CnC-List 
wrote:

> Is there anything special about the cap, or can I just get one from an
> auto parts store?
>
> Alan Bergen
>
> On Fri, Apr 5, 2019 at 1:38 PM David Knecht via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> I second Charlie’s message.  My overflow tank developed a crack and it
>> took me a while to find the slow leak.  Fixed it with a plastic
>> glue/sealant and it has been fine since.  Dave
>>
>> S/V Aries
>> 1990 C 34+
>> New London, CT
>>
>>
>> On Apr 5, 2019, at 2:55 PM, Charlie Nelson via CnC-List <
>> cnc-list@cnc-list.com> wrote:
>>
>> Also be sure your overflow tank/fittings and the ‘radiator’ cap are both
>> working and have good seals.
>>
>> Sent from AOL Mobile Mail
>> Get the new AOL app: mail.mobile.aol.com
>> 
>>
>>
>> ___
>>
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>>
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Re: Stus-List Antifreeze leak

[Charles Nelson via CnC-List]

AFAIK, the only thing 'special' about them is the pressure it takes to open the 
valve against the spring--this value is probably pretty standard at so many 
lbs/sq. in. but it would be listed for your engine somewhere.

My engine had a mysterious leak that I finally determined was a result of NO 
rubber seal in it!

Charlie Nelson
C 36XL/kcb
Water Phantom




Sent from my iPad

> On Apr 5, 2019, at 4:50 PM, ALAN BERGEN via CnC-List  
> wrote:
> 
> Is there anything special about the cap, or can I just get one from an auto 
> parts store?
> 
> Alan Bergen
> 
>> On Fri, Apr 5, 2019 at 1:38 PM David Knecht via CnC-List 
>>  wrote:
>> I second Charlie’s message.  My overflow tank developed a crack and it took 
>> me a while to find the slow leak.  Fixed it with a plastic glue/sealant and 
>> it has been fine since.  Dave
>> 
>> S/V Aries
>> 1990 C 34+
>> New London, CT
>> 
>> 
>> 
>>> On Apr 5, 2019, at 2:55 PM, Charlie Nelson via CnC-List 
>>>  wrote:
>>> 
>>> Also be sure your overflow tank/fittings and the ‘radiator’ cap are both 
>>> working and have good seals.
>>> 
>>> Sent from AOL Mobile Mail
>>> Get the new AOL app: mail.mobile.aol.com
>> 
>> ___
>> 
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Re: Stus-List Antifreeze leak

[ALAN BERGEN via CnC-List]

Is there anything special about the cap, or can I just get one from an auto
parts store?

Alan Bergen

On Fri, Apr 5, 2019 at 1:38 PM David Knecht via CnC-List <
cnc-list@cnc-list.com> wrote:

> I second Charlie’s message.  My overflow tank developed a crack and it
> took me a while to find the slow leak.  Fixed it with a plastic
> glue/sealant and it has been fine since.  Dave
>
> S/V Aries
> 1990 C 34+
> New London, CT
>
>
> On Apr 5, 2019, at 2:55 PM, Charlie Nelson via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> Also be sure your overflow tank/fittings and the ‘radiator’ cap are both
> working and have good seals.
>
> Sent from AOL Mobile Mail
> Get the new AOL app: mail.mobile.aol.com
> 
>
>
> ___
>
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>
>
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Re: Stus-List Antifreeze leak

[David Knecht via CnC-List]

I second Charlie’s message.  My overflow tank developed a crack and it took me 
a while to find the slow leak.  Fixed it with a plastic glue/sealant and it has 
been fine since.  Dave

S/V Aries
1990 C 34+
New London, CT



> On Apr 5, 2019, at 2:55 PM, Charlie Nelson via CnC-List 
>  wrote:
> 
> Also be sure your overflow tank/fittings and the ‘radiator’ cap are both 
> working and have good seals.
> 
> Sent from AOL Mobile Mail
> Get the new AOL app: mail.mobile.aol.com 
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Re: Stus-List Antifreeze leak

[Charlie Nelson via CnC-List]

Also be sure your overflow tank/fittings and the ‘radiator’ cap are both 
working and have good seals.

Sent from AOL Mobile Mail
Get the new AOL app: mail.mobile.aol.com
 On Friday, April 5, 2019, Gary Russell via CnC-List  
wrote:

You can't rule out a head gasket, either.  Look for a milky substance in the 
engine oil.GaryS/V Kaylarah'90 C 37+East Greenwich, RI, USA
~~~_/)~~



On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List 
 wrote:

Over a period of time, I'm losing antifreeze from the engine. I haven't seen 
any leaks coming from any of the hoses or hose connections while the engine is 
running. Can anyone confirm that the likely cause is a leak in the heat 
exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult is it to 
replace/repair the heat exchanger core?
Alan Bergen35 Mk III ThirstyRose City YCPortland, OR
___

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Re: Stus-List Antifreeze leak

[Jerome Tauber via CnC-List]

If it was head gasket you’d see it in the oil. If cap leaked you’d see it in 
bilge or smell it. Heat exchanger hole just pumps it out with no tell tale 
signs. Jerry 

Sent from my iPhone

> On Apr 5, 2019, at 12:43 PM, Jerome Tauber via CnC-List 
>  wrote:
> 
> Had same Problem on Beneteau 411 and indeed there was a hole in the heat 
> exchanger so antifreeze got pumped out with raw water.  Jerry 
> 
> Sent from my iPhone
> 
>> On Apr 5, 2019, at 11:48 AM, Gary Russell via CnC-List 
>>  wrote:
>> 
>> You can't rule out a head gasket, either.  Look for a milky substance in the 
>> engine oil.
>> Gary
>> S/V Kaylarah
>> '90 C 37+
>> East Greenwich, RI, USA
>> ~~~_/)~~
>> 
>> 
>> 
>>> On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List 
>>>  wrote:
>>> Over a period of time, I'm losing antifreeze from the engine. I haven't 
>>> seen any leaks coming from any of the hoses or hose connections while the 
>>> engine is running. Can anyone confirm that the likely cause is a leak in 
>>> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult 
>>> is it to replace/repair the heat exchanger core?
>>> 
>>> Alan Bergen
>>> 35 Mk III Thirsty
>>> Rose City YC
>>> Portland, OR
>>> ___
>>> 
>>> Thanks everyone for supporting this list with your contributions.  Each and 
>>> every one is greatly appreciated.  If you want to support the list - use 
>>> PayPal to send contribution --   https://www.paypal.me/stumurray
>>> 
>> ___
>> 
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>> 
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> 
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Re: Stus-List Antifreeze leak

[Jerome Tauber via CnC-List]

Had same Problem on Beneteau 411 and indeed there was a hole in the heat 
exchanger so antifreeze got pumped out with raw water.  Jerry 

Sent from my iPhone

> On Apr 5, 2019, at 11:48 AM, Gary Russell via CnC-List 
>  wrote:
> 
> You can't rule out a head gasket, either.  Look for a milky substance in the 
> engine oil.
> Gary
> S/V Kaylarah
> '90 C 37+
> East Greenwich, RI, USA
> ~~~_/)~~
> 
> 
> 
>> On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List 
>>  wrote:
>> Over a period of time, I'm losing antifreeze from the engine. I haven't seen 
>> any leaks coming from any of the hoses or hose connections while the engine 
>> is running. Can anyone confirm that the likely cause is a leak in the heat 
>> exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult is it to 
>> replace/repair the heat exchanger core?
>> 
>> Alan Bergen
>> 35 Mk III Thirsty
>> Rose City YC
>> Portland, OR
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
> ___
> 
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Re: Stus-List Antifreeze leak

[ALAN BERGEN via CnC-List]

The cp is old. I'll replace that first. Thanks for mentioning that.

On Fri, Apr 5, 2019 at 9:19 AM Dennis C. via CnC-List 
wrote:

> How old is the cap on the coolant system?
>
> Dennis C.
>
> On Fri, Apr 5, 2019 at 10:47 AM ALAN BERGEN via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Over a period of time, I'm losing antifreeze from the engine. I haven't
>> seen any leaks coming from any of the hoses or hose connections while the
>> engine is running. Can anyone confirm that the likely cause is a leak in
>> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
>> is it to replace/repair the heat exchanger core?
>>
>> Alan Bergen
>> 35 Mk III Thirsty
>> Rose City YC
>> Portland, OR
>> ___
>>
>> Thanks everyone for supporting this list with your contributions.  Each
>> and every one is greatly appreciated.  If you want to support the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
>>
>> ___
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Re: Stus-List Antifreeze leak

[ALAN BERGEN via CnC-List]

I already ruled that out.

On Fri, Apr 5, 2019 at 8:50 AM Gary Russell via CnC-List <
cnc-list@cnc-list.com> wrote:

> You can't rule out a head gasket, either.  Look for a milky substance in
> the engine oil.
> Gary
> S/V Kaylarah
> '90 C 37+
> East Greenwich, RI, USA
> ~~~_/)~~
>
>
>
> On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Over a period of time, I'm losing antifreeze from the engine. I haven't
>> seen any leaks coming from any of the hoses or hose connections while the
>> engine is running. Can anyone confirm that the likely cause is a leak in
>> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
>> is it to replace/repair the heat exchanger core?
>>
>> Alan Bergen
>> 35 Mk III Thirsty
>> Rose City YC
>> Portland, OR
>> ___
>>
>> Thanks everyone for supporting this list with your contributions.  Each
>> and every one is greatly appreciated.  If you want to support the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
>>
>> ___
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>
>
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Re: Stus-List Antifreeze leak

[Dennis C. via CnC-List]

How old is the cap on the coolant system?

Dennis C.

On Fri, Apr 5, 2019 at 10:47 AM ALAN BERGEN via CnC-List <
cnc-list@cnc-list.com> wrote:

> Over a period of time, I'm losing antifreeze from the engine. I haven't
> seen any leaks coming from any of the hoses or hose connections while the
> engine is running. Can anyone confirm that the likely cause is a leak in
> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
> is it to replace/repair the heat exchanger core?
>
> Alan Bergen
> 35 Mk III Thirsty
> Rose City YC
> Portland, OR
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
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Re: Stus-List Antifreeze leak

[Gary Russell via CnC-List]

You can't rule out a head gasket, either.  Look for a milky substance in
the engine oil.
Gary
S/V Kaylarah
'90 C 37+
East Greenwich, RI, USA
~~~_/)~~



On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List <
cnc-list@cnc-list.com> wrote:

> Over a period of time, I'm losing antifreeze from the engine. I haven't
> seen any leaks coming from any of the hoses or hose connections while the
> engine is running. Can anyone confirm that the likely cause is a leak in
> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
> is it to replace/repair the heat exchanger core?
>
> Alan Bergen
> 35 Mk III Thirsty
> Rose City YC
> Portland, OR
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
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Stus-List Antifreeze leak

[ALAN BERGEN via CnC-List]

Over a period of time, I'm losing antifreeze from the engine. I haven't
seen any leaks coming from any of the hoses or hose connections while the
engine is running. Can anyone confirm that the likely cause is a leak in
the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult
is it to replace/repair the heat exchanger core?

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