Hello,
Yesterday I was working on tuning the (newly rebuild)
MD6A engine of "Lotta". In the beginning
there was a problem with the water flow
in the raw water circuit. The water pump was working
properly, but sometime there was no water at the
exhaust output at the stern.
Finally it seemed that everything was OK
and we continued with other things, like tuning the combi.
Suddenly, with the engine running,
I saw water coming out the air filter!
I can not be absolutely sure if it was raw water
or fresh water, because
due to the problems with the cooling system,
the engine fresh water circuit was temporarily
filled with (fresh) water not the cooling liquid.
Seems that the engine survived this experience.
Oil was pumped out of the engine
(no obvious traces of water in the oil).
The engine was turned many times first by hand, than
with the starter engine. Finally it was started
and run for few minutes with no obvious problem.
The only possibility of getting water into the engine,
which I can think about, is the exhaust. So the exhaust tube
was removed. I could not see any obvious problem
with this tube. As far as I can judge, there was nothing
abnormal in the connection of the tube with the exhaust output
of the engine.
Please help understanding what was wrong!
I can't actually understand how the raw water, which comes into
outside space of the exhaust tube at the exhaust of the engine
is protected from getting into to the internal (metal) pipe
(and then perhaps, in some situations, back to the engine).
The metal pipe, which is only by a few cm longer than the rubber
outside pipe, is just inserted into the exhaust of the engine..
Such connection of the internal pipe to the engine is certainly
not water tight (and there is always water around this pipe!)
Anyway, without understanding what happened,
I don't want to connect the exhaust tube back.
I will appreciate any ideas on the reason of the problem
and how to avoid it in the future.
I hoped to have some sailing soon...
Marcin
Yesterday I was working on tuning the (newly rebuild)
MD6A engine of "Lotta". In the beginning
there was a problem with the water flow
in the raw water circuit. The water pump was working
properly, but sometime there was no water at the
exhaust output at the stern.
Finally it seemed that everything was OK
and we continued with other things, like tuning the combi.
Suddenly, with the engine running,
I saw water coming out the air filter!
I can not be absolutely sure if it was raw water
or fresh water, because
due to the problems with the cooling system,
the engine fresh water circuit was temporarily
filled with (fresh) water not the cooling liquid.
Seems that the engine survived this experience.
Oil was pumped out of the engine
(no obvious traces of water in the oil).
The engine was turned many times first by hand, than
with the starter engine. Finally it was started
and run for few minutes with no obvious problem.
The only possibility of getting water into the engine,
which I can think about, is the exhaust. So the exhaust tube
was removed. I could not see any obvious problem
with this tube. As far as I can judge, there was nothing
abnormal in the connection of the tube with the exhaust output
of the engine.
Please help understanding what was wrong!
I can't actually understand how the raw water, which comes into
outside space of the exhaust tube at the exhaust of the engine
is protected from getting into to the internal (metal) pipe
(and then perhaps, in some situations, back to the engine).
The metal pipe, which is only by a few cm longer than the rubber
outside pipe, is just inserted into the exhaust of the engine..
Such connection of the internal pipe to the engine is certainly
not water tight (and there is always water around this pipe!)
Anyway, without understanding what happened,
I don't want to connect the exhaust tube back.
I will appreciate any ideas on the reason of the problem
and how to avoid it in the future.
I hoped to have some sailing soon...
Marcin
