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

Clogged raw water intake?

"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

Clogged raw water intake?

"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

"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

"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

"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

"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

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

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

On 19 Jan 2004 06:19:16 -0800, (jzlatar-genesis)
wrote:

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


If a plugged raw water intake or sea strainer is not present, the
problem might be that the dry impeller is not creating a sufficient
vacuum to draw water. I have used two approaches.

1) try revving the engine to about 3000 rpm that might draw water
through the system.

2) (This one requires greater care.) Disconnect the water intake from
the inlet to the heat exchanger. While the engine is running apply
some vacuum to the hose just was you would when siphoning. When (if)
the water starts flowing, place it back on the inlet and tighten the
hose clamp.

I have used both techniques on a 3GM.

Also check the cam inside the impeller chamber. It might be worn.


Jack

__________________________________________________
Jack Dale
Swiftsure Sailing Academy
Director/ISPA and CYA Instructor
http://www.swiftsuresailing.com
Phone: 1 (877) 470-SAIL (toll free)
__________________________________________________