where to tap into Hot water YANMAR 18HP?
 

I have an 18HP yanmar 2cyl and would like to put in an aux heater from the
internal cooling system (glycol). There are many plugs, thermhousing, side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick

where to tap into Hot water YANMAR 18HP?
 

Not sure of your engine/heat exchanger configuration, but the hottest
cooling water would where it comes out of the engine and goes into the heat
exchanger, then the return water would go into the heat exchanger, where you
disconnected to divert the water. Let the engine cooling pump do the
circulation through the hot water tank coil.

That is the simplest since there won't be much flow until the engine
thermosat opens up. If you circulate the water from the wrong point, you
will warm the cooling water with the already hot water in the tank.

You might check with your engine dealer or manufacturer.. They may have
already addressed this question and can speak with some authority that you
could fall back on if something goes wrong.

It would be adviseable to have the water heater/storage tank higher than the
engine. This will keep you hot water heat from escaping back to the engine
block by thermal convection.

I puzzled over this question recently because I want to have a way for the
generator to heat the water as well. The valve complications cause me to
consider adding another heating coil in the water heater tank.. Simpler and
but not cheaper. One possibility I have is to remove the electric element
and put the second coil in that hole. Right now I just want to see how well
the engine does at heating the water.. My Volvo still has the OEM 140 deg
thermotat installed. (Volvo says leave it even if I switch to fresh water
cooling because all the clearance/tolerances, etc are for SW cooling at 140
deg.)

Steve
s/v Good Intentions

where to tap into Hot water YANMAR 18HP?
 

My Volvo still has the OEM 140 deg
thermotat installed. (Volvo says leave it even if I switch to fresh water
cooling because all the clearance/tolerances, etc are for SW cooling at 140
deg.)

on some Volvo raw cooled engines the factory specifically recommends against
using cooling water to heat hot water for showers, as this can crack cylinder
heads. Not sure of the dynamics as I do not have a Volvo, but certainly the
man who told me such is one fine mechanic.

where to tap into Hot water YANMAR 18HP?
 

My water heater, as I assume most do, has a 'one way valve' on the intake.

SV


"Steve" wrote in message ...


It would be adviseable to have the water heater/storage tank higher than the
engine. This will keep you hot water heat from escaping back to the engine
block by thermal convection.

where to tap into Hot water YANMAR 18HP?
 

I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.



On Mon, 29 Mar 2004 16:27:45 -0400, none
wrote:


I have an 18HP yanmar 2cyl and would like to put in an aux heater from the
internal cooling system (glycol). There are many plugs, thermhousing, side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick

where to tap into Hot water YANMAR 18HP?
 

If you put an inline tee fitting with a cap, you can fill the hoses
with anti freeze and bleed them much more easily.

On Tue, 30 Mar 2004 11:22:09 -0400, none
wrote:

thanks a lot Marc.
Out thru the T-stat housing (which i see) return thru the water pump low
press side...which i will locate.
My manual doesn't appear to have that info.
Rick
.
On Tue, 30 Mar 2004 14:29:16 GMT, Marc wrote:
I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.
snip...

where to tap into Hot water YANMAR 18HP?
 

thanks a lot Marc.
Out thru the T-stat housing (which i see) return thru the water pump low
press side...which i will locate.
My manual doesn't appear to have that info.
Rick
..
On Tue, 30 Mar 2004 14:29:16 GMT, Marc wrote:
I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.
snip...

where to tap into Hot water YANMAR 18HP?
 

note that a 2GM20f is **freshwater** cooled. a raw water cooled engine is a
different breed of cat.

I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.



On Mon, 29 Mar 2004 16:27:45 -0400, none
wrote:


I have an 18HP yanmar 2cyl and would like to put in an aux heater from the
internal cooling system (glycol). There are many plugs, thermhousing, side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick

where to tap into Hot water YANMAR 18HP?
 

"JAXAshby" wrote in message
...
note that a 2GM20f is **freshwater** cooled. a raw water cooled engine is
a
different breed of cat.


Most common marine water heaters are equipt with a copper or brass engine
water coil.. Therefore raw water shouldn't be circulated through it..

If a person wants to us raw water to heat domestic water, this coil should
be replace with something in CuNi.

However, most raw water cooled engine have a low temp thermosat and the
water temp may never get over 150 degree. Not very much of a rise for stored
hot water. A 6 gal tank wouldn't provide more than a couple showers. (the
main reason I want hot water).

Steve
s/v Good Intentions

where to tap into Hot water YANMAR 18HP?
 

Also a good idea to put a bypass on the heater lines, that way you
don't have to fill (6gals) the heater with pink stuff. Or at least
make the lines long enough and accesible. Mine is a PITA to get to.
And don't forget to drain the heater for winter.

Scott


Marc wrote in message . ..
If you put an inline tee fitting with a cap, you can fill the hoses
with anti freeze and bleed them much more easily.

On Tue, 30 Mar 2004 11:22:09 -0400, none
wrote:

thanks a lot Marc.
Out thru the T-stat housing (which i see) return thru the water pump low
press side...which i will locate.
My manual doesn't appear to have that info.
Rick
.
On Tue, 30 Mar 2004 14:29:16 GMT, Marc wrote:
I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.
snip...

where to tap into Hot water YANMAR 18HP?
 

in addition, most raw water cooled engines don't have hot water coming out of
them anywhere, except sometimes between the cylinder and the exhaust manifold.

pumping raw water slightly warmed by the engine doesn't make for hot water in
the heater, and on some raw water cooled engines splitting the hot engine block
water away from its next point to the water heater and back to that point can
cause uneven engine cooling.

note that a 2GM20f is **freshwater** cooled. a raw water cooled engine is
a
different breed of cat.


Most common marine water heaters are equipt with a copper or brass engine
water coil.. Therefore raw water shouldn't be circulated through it..

If a person wants to us raw water to heat domestic water, this coil should
be replace with something in CuNi.

However, most raw water cooled engine have a low temp thermosat and the
water temp may never get over 150 degree. Not very much of a rise for stored
hot water. A 6 gal tank wouldn't provide more than a couple showers. (the
main reason I want hot water).

Steve
s/v Good Intentions

where to tap into Hot water YANMAR 18HP?
 

Original post

I have an 18HP yanmar 2cyl and would like to put in an aux heater from
the
internal cooling system (glycol). There are many plugs, thermhousing,
side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?

Taking his post at face value with the reference to the "internal
cooling system (glycol)" I understood him to mean a Yanmar 2GM20 F
and answered accordingly and specifically..




On 30 Mar 2004 19:45:43 GMT, (JAXAshby) wrote:

note that a 2GM20f is **freshwater** cooled. a raw water cooled engine is a
different breed of cat.

I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.



On Mon, 29 Mar 2004 16:27:45 -0400, none
wrote:


I have an 18HP yanmar 2cyl and would like to put in an aux heater from the
internal cooling system (glycol). There are many plugs, thermhousing, side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick

where to tap into Hot water YANMAR 18HP?
 

FTR..mine is fresh water cooled. You are right about sal****er cooled
engines...the HW heater wouldn't last a season without a scarificial anode.
Rick

On Tue, 30 Mar 2004 12:03:28 -0800, Steve wrote:
"JAXAshby" wrote in message
...
note that a 2GM20f is **freshwater** cooled. a raw water cooled engine
is a different breed of cat.


Most common marine water heaters are equipt with a copper or brass engine
water coil.. Therefore raw water shouldn't be circulated through it..

If a person wants to us raw water to heat domestic water, this coil
should
be replace with something in CuNi.

However, most raw water cooled engine have a low temp thermosat and the
water temp may never get over 150 degree. Not very much of a rise for
stored
hot water. A 6 gal tank wouldn't provide more than a couple showers. (the
main reason I want hot water).

Steve
s/v Good Intentions





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Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

where to tap into Hot water YANMAR 18HP?
 

correct you are, thanks again.
the only confusion, my fault, is the heater type....i want an air heater
like an auxilliary car heater. I have one from a van with it's own fan.
nice for the fall....and any other time in Canada.
rick

On Tue, 30 Mar 2004 22:26:09 GMT, Marc wrote:

Original post

I have an 18HP yanmar 2cyl and would like to put in an aux heater from
the
internal cooling system (glycol). There are many plugs, thermhousing,
side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?

Taking his post at face value with the reference to the "internal
cooling system (glycol)" I understood him to mean a Yanmar 2GM20 F
and answered accordingly and specifically..




On 30 Mar 2004 19:45:43 GMT, (JAXAshby) wrote:

note that a 2GM20f is **freshwater** cooled. a raw water cooled engine
is a
different breed of cat.

I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.



On Mon, 29 Mar 2004 16:27:45 -0400, none
wrote:


I have an 18HP yanmar 2cyl and would like to put in an aux heater
from the
internal cooling system (glycol). There are many plugs, thermhousing,
side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick












--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

where to tap into Hot water YANMAR 18HP?
 

marc, yes you did. at one point, another made mention of his raw water cooled
engine. hence, my post.

Original post

I have an 18HP yanmar 2cyl and would like to put in an aux heater from
the
internal cooling system (glycol). There are many plugs, thermhousing,
side
of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?

Taking his post at face value with the reference to the "internal
cooling system (glycol)" I understood him to mean a Yanmar 2GM20 F
and answered accordingly and specifically..




On 30 Mar 2004 19:45:43 GMT, (JAXAshby) wrote:

note that a 2GM20f is **freshwater** cooled. a raw water cooled engine is a
different breed of cat.

I am referencing the Official Yanmar Service Manual for the 2gm20f.

One connection is a plug on the fresh water pump on the hose side that
leads from the heat exchanger. The other is a plug on the side of the
thermostat housing that leads to the heat exchanger. They are both
3/8" npt fittings.



On Mon, 29 Mar 2004 16:27:45 -0400, none
wrote:


I have an 18HP yanmar 2cyl and would like to put in an aux heater from the

internal cooling system (glycol). There are many plugs, thermhousing, side

of block etc... so i am unsure where to tie in for a send return that
won't affect the cooling of the motor. any thoughts?
rick

where to tap into Hot water YANMAR 18HP?
 

If you can break into the cooling loop ' between' the engine and the
exhaust manifold - on some engines this is not possible but on some the
connection is by a small rubber hose. Otherwise the next best place
is just before the injection port to the water lift muffler.

where to tap into Hot water YANMAR 18HP?
 

I thought we he was talking about a hot water tank.


"WaIIy" wrote in message
...
On 30 Mar 2004 12:55:38 -0800, (Scott) wrote:

Also a good idea to put a bypass on the heater lines, that way you
don't have to fill (6gals) the heater with pink stuff. Or at least
make the lines long enough and accesible. Mine is a PITA to get to.
And don't forget to drain the heater for winter.

Scott


How in the world do you figure you are putting 6 gallons of pink stuff
in the water heater?

where to tap into Hot water YANMAR 18HP?
 

I thought we he was talking about a hot water tank.


"WaIIy" wrote in message
...
On 30 Mar 2004 12:55:38 -0800, (Scott) wrote:

Also a good idea to put a bypass on the heater lines, that way you
don't have to fill (6gals) the heater with pink stuff. Or at least
make the lines long enough and accesible. Mine is a PITA to get to.
And don't forget to drain the heater for winter.

Scott


How in the world do you figure you are putting 6 gallons of pink stuff
in the water heater?

where to tap into Hot water YANMAR 18HP?
 

on a fresh water cooled engine?
rick

On Wed, 31 Mar 2004 03:31:51 GMT, Rich Hampel wrote:

If you can break into the cooling loop ' between' the engine and the
exhaust manifold - on some engines this is not possible but on some the
connection is by a small rubber hose. Otherwise the next best place
is just before the injection port to the water lift muffler.

where to tap into Hot water YANMAR 18HP?
 

on a fresh water cooled engine?
rick

On Wed, 31 Mar 2004 03:31:51 GMT, Rich Hampel wrote:

If you can break into the cooling loop ' between' the engine and the
exhaust manifold - on some engines this is not possible but on some the
connection is by a small rubber hose. Otherwise the next best place
is just before the injection port to the water lift muffler.

where to tap into Hot water YANMAR 18HP?
 

hot water heater...my bad.
rick

On Thu, 01 Apr 2004 03:40:25 GMT, Scott Vernon wrote:

I thought we he was talking about a hot water tank.


"WaIIy" wrote in message
...
On 30 Mar 2004 12:55:38 -0800, (Scott) wrote:

Also a good idea to put a bypass on the heater lines, that way you
don't have to fill (6gals) the heater with pink stuff. Or at least
make the lines long enough and accesible. Mine is a PITA to get to.
And don't forget to drain the heater for winter.

Scott


How in the world do you figure you are putting 6 gallons of pink stuff
in the water heater?





--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

where to tap into Hot water YANMAR 18HP?
 

hot water heater...my bad.
rick

On Thu, 01 Apr 2004 03:40:25 GMT, Scott Vernon wrote:

I thought we he was talking about a hot water tank.


"WaIIy" wrote in message
...
On 30 Mar 2004 12:55:38 -0800, (Scott) wrote:

Also a good idea to put a bypass on the heater lines, that way you
don't have to fill (6gals) the heater with pink stuff. Or at least
make the lines long enough and accesible. Mine is a PITA to get to.
And don't forget to drain the heater for winter.

Scott


How in the world do you figure you are putting 6 gallons of pink stuff
in the water heater?





--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/