You should be able to verify the intake end, including the pump, simply by
disconnecting the pump output and turning the engine over for a few seconds with
the compression releases open. It should pump a good stream immediately. I
assume you have done that from your comment of "pump is working."

The next step is the heat exchanger, which can be clogged, and following that is
the exhaust elbow. If you have flow from the pump, you can disconnect the line
from the heat exchanger to the elbow and turn it over again.

One of my engines carbons up the elbow so quickly enough that I pull it and
scrape it out every year or two. Its only a 1 hour job if you have the gaskets
and the wrenches that can reach the nuts. Its also possible that the exhaust
pipe or muffler has a problem, but the engine wouldn't start if the exhaust was
actually clogged.

-jeff



"Leanne" wrote in message
...

"Ray D" rayd at gis.net wrote in message
...
Clogged raw water intake?

I would also check the raw water strainer and when the impeller
was changed, was it whole or was there a piece missing that could
have moved into the cooling system.

Leanne

"jzlatar-genesis" wrote in message
om...
I have a yanmar 2GM20F installed in a Plenamar 300 with the
following
problem, No water coming out of the exhaust pipe with the
result of
overheating and the pump is working with a new impeller, what
could be
the reason for it and the solution.
Thanks in advance
Jzlatar-geminis

"Jeff Morris" wrote in message ...
You should be able to verify the intake end, including the pump, simply by
disconnecting the pump output and turning the engine over for a few seconds with
the compression releases open. It should pump a good stream immediately. I
assume you have done that from your comment of "pump is working."

The next step is the heat exchanger, which can be clogged, and following that is
the exhaust elbow. If you have flow from the pump, you can disconnect the line
from the heat exchanger to the elbow and turn it over again.

One of my engines carbons up the elbow so quickly enough that I pull it and
scrape it out every year or two. Its only a 1 hour job if you have the gaskets
and the wrenches that can reach the nuts. Its also possible that the exhaust
pipe or muffler has a problem, but the engine wouldn't start if the exhaust was
actually clogged.

-jeff



"Leanne" wrote in message
...

"Ray D" rayd at gis.net wrote in message
...
Clogged raw water intake?

I would also check the raw water strainer and when the impeller
was changed, was it whole or was there a piece missing that could
have moved into the cooling system.

Leanne

"jzlatar-genesis" wrote in message
om...
I have a yanmar 2GM20F installed in a Plenamar 300 with the
following
problem, No water coming out of the exhaust pipe with the
result of
overheating and the pump is working with a new impeller, what
could be
the reason for it and the solution.
Thanks in advance
Jzlatar-geminis

Thanks for the prompt response.
yes I disconnect the pump output and turn the engine over for a few
seconds with
the compression releases open. I have a good stream immediately, for that reason know that the pump is working, when I change the impeller the old one was intact.
Regarding the muffler, I presume that is working because the fumes
come out, if the heat exchanger,is clogged, that means that I have to
open the engine?

Jorge

In article ,
jzlatar-genesis wrote:

Regarding the muffler, I presume that is working because the fumes
come out,
NO NO NO NO NO NO ..... fumes AND water need to come out of the exhaust
system. If you have water up to the engine as per your prior
inspection, then open/disconnect the water exit hose of the exhaust
manifold; if flow then you probably have a 'salted' injection elbow, if
no flow then you probably have a fouled exhaust manifold. Cast irion
exhaust manifolds can fail in two ways: corrosion of the base metal
that issues huge platelettes' of rust that lodge in and block the flow
channels ..... or the deposition of carbonate salts (boiler scale
fouling).

What engine do you have?



if the heat exchanger,is clogged, that means that I have to
open the engine?

You're right except that the exhaust elbow isn't part of the muffler (assuming
he actually has a muffler).

And his engine is a 2GM20F which is fresh water cooled, and has a heat exchanger
bolted on (but certainly distinct from) the manifold.


"Rich Hampel" wrote in message
...
In article ,
jzlatar-genesis wrote:

Regarding the muffler, I presume that is working because the fumes
come out,
NO NO NO NO NO NO ..... fumes AND water need to come out of the exhaust
system. If you have water up to the engine as per your prior
inspection, then open/disconnect the water exit hose of the exhaust
manifold; if flow then you probably have a 'salted' injection elbow, if
no flow then you probably have a fouled exhaust manifold. Cast irion
exhaust manifolds can fail in two ways: corrosion of the base metal
that issues huge platelettes' of rust that lodge in and block the flow
channels ..... or the deposition of carbonate salts (boiler scale
fouling).

What engine do you have?



if the heat exchanger,is clogged, that means that I have to
open the engine?

On Mon, 19 Jan 2004 16:40:56 -0500, "Jeff Morris"
wrote:

And his engine is a 2GM20F which is fresh water cooled, and has a heat exchanger
bolted on (but certainly distinct from) the manifold.
Not sure what you meant by "distinct", but the manifold is part of the
heat exchanger assembly. The manifold is at the bottom of the
exchanger in the fresh water reservoir.
__________________________________________________ __________
Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com
To reply, lose the capitals and do the obvious.

Take a look at cpRepeater, my NMEA data integrator, repeater, and
logger at http://www.worldwidewiley.com/

You could be right - I stupidly left my Yanmar books on the boat which is now
sealed up!

But still, the actual heat exchanger tubes can be pulled out of the assembly and
cleaned out. I didn't think they could get "salted."

"Glen "Wiley" Wilson" wrote in message
...
On Mon, 19 Jan 2004 16:40:56 -0500, "Jeff Morris"
wrote:

And his engine is a 2GM20F which is fresh water cooled, and has a heat
exchanger
bolted on (but certainly distinct from) the manifold.
Not sure what you meant by "distinct", but the manifold is part of the
heat exchanger assembly. The manifold is at the bottom of the
exchanger in the fresh water reservoir.
__________________________________________________ __________
Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com
To reply, lose the capitals and do the obvious.

Take a look at cpRepeater, my NMEA data integrator, repeater, and
logger at http://www.worldwidewiley.com/

I have been trying to get the manual or part catalog for the Yanmar
2GM20F but in Santiago Chile is a bit hard, Y have ordered it to
Yanmar directly. My question...Does any body have a photocopy that can
send me to my mail? I mean scanned, only the page where the heat
exchange is?

Thanks in advance
Jorge -Genesis

I have been trying to get the manual or part catalog for the Yanmar
2GM20F but in Santiago Chile is a bit hard, Y have ordered it to
Yanmar directly. My question...Does any body have a photocopy that can
send me to my mail? I mean scanned, only the page where the heat
exchange is?

Thanks in advance
Jorge -Genesis

You could be right - I stupidly left my Yanmar books on the boat which is now
sealed up!

But still, the actual heat exchanger tubes can be pulled out of the assembly and
cleaned out. I didn't think they could get "salted."

"Glen "Wiley" Wilson" wrote in message
...
On Mon, 19 Jan 2004 16:40:56 -0500, "Jeff Morris"
wrote:

And his engine is a 2GM20F which is fresh water cooled, and has a heat
exchanger
bolted on (but certainly distinct from) the manifold.
Not sure what you meant by "distinct", but the manifold is part of the
heat exchanger assembly. The manifold is at the bottom of the
exchanger in the fresh water reservoir.
__________________________________________________ __________
Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com
To reply, lose the capitals and do the obvious.

Take a look at cpRepeater, my NMEA data integrator, repeater, and
logger at http://www.worldwidewiley.com/

On Mon, 19 Jan 2004 16:40:56 -0500, "Jeff Morris"
wrote:

And his engine is a 2GM20F which is fresh water cooled, and has a heat exchanger
bolted on (but certainly distinct from) the manifold.
Not sure what you meant by "distinct", but the manifold is part of the
heat exchanger assembly. The manifold is at the bottom of the
exchanger in the fresh water reservoir.
__________________________________________________ __________
Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com
To reply, lose the capitals and do the obvious.

Take a look at cpRepeater, my NMEA data integrator, repeater, and
logger at http://www.worldwidewiley.com/