I have a 2002 Searay 270 Sundeck with a 320 hp Mercruiser 6.2L
MPI/Bravo 3 Duoprop which has just developed an engine alarm problem.

After running 10 to 15 minutes at a cruising speed of about 3400 RPM,
the engine alarm sounds. Oil pressure, oil level, engine temperature
and outdrive lubrication levels all appear to be normal. The alarm
continues to sound until idling back and shifting into neurtral.

If I run below 3100 RPM the alarm does not go off.

I have checked the engine with a digital heat gun and can find no sign
of abnormal temperatures anywhere. The serpentine belt is properly
tightened and everything else seems normal in every way.

Does anyone have any suggestions on how to troubleshoot this problem ?

Is there any diagnostic equipment or process available to find out
exactly which sensor is being tripped ?

"Wayne.B" wrote in message
...
I have a 2002 Searay 270 Sundeck with a 320 hp Mercruiser 6.2L
MPI/Bravo 3 Duoprop which has just developed an engine alarm problem.

After running 10 to 15 minutes at a cruising speed of about 3400 RPM,
the engine alarm sounds. Oil pressure, oil level, engine temperature
and outdrive lubrication levels all appear to be normal. The alarm
continues to sound until idling back and shifting into neurtral.

If I run below 3100 RPM the alarm does not go off.

I have checked the engine with a digital heat gun and can find no sign
of abnormal temperatures anywhere. The serpentine belt is properly
tightened and everything else seems normal in every way.

Does anyone have any suggestions on how to troubleshoot this problem ?

Is there any diagnostic equipment or process available to find out
exactly which sensor is being tripped ?


The behavior you describe is usually associated with a low level of outdrive
lubricant in the reservoir, but you say it's normal. I would suggest having
another person aboard and having them visually inspect the level of the
reservoir while the boat is running at 3100+ RPM to see if the level has
dropped.

On Mon, 12 Mar 2007 17:13:37 GMT, "RG" wrote:

The behavior you describe is usually associated with a low level of outdrive
lubricant in the reservoir, but you say it's normal. I would suggest having
another person aboard and having them visually inspect the level of the
reservoir while the boat is running at 3100+ RPM to see if the level has
dropped.

Thanks but we did that. It seemed to be fine.

"Wayne.B" wrote in message
...
On Mon, 12 Mar 2007 17:13:37 GMT, "RG" wrote:

The behavior you describe is usually associated with a low level of
outdrive
lubricant in the reservoir, but you say it's normal. I would suggest
having
another person aboard and having them visually inspect the level of the
reservoir while the boat is running at 3100+ RPM to see if the level has
dropped.

Thanks but we did that. It seemed to be fine.

Well, you have a bit of a head scratcher on your hands there. Probably the
shortest route to a diagnosis would be to read any codes that may have been
thrown. Probably a dealer issue.

On Sun, 11 Mar 2007 10:48:55 -0400, Wayne.B
wrote:

I have a 2002 Searay 270 Sundeck with a 320 hp Mercruiser 6.2L
MPI/Bravo 3 Duoprop which has just developed an engine alarm problem.

After running 10 to 15 minutes at a cruising speed of about 3400 RPM,
the engine alarm sounds. Oil pressure, oil level, engine temperature
and outdrive lubrication levels all appear to be normal. The alarm
continues to sound until idling back and shifting into neurtral.

If I run below 3100 RPM the alarm does not go off.

I have checked the engine with a digital heat gun and can find no sign
of abnormal temperatures anywhere. The serpentine belt is properly
tightened and everything else seems normal in every way.

Does anyone have any suggestions on how to troubleshoot this problem ?

Might be difficult without the tools. This might interest you.
http://boards.trailerboats.com/cgi-b...c;f=4;t=000248

Is there any diagnostic equipment or process available to find out
exactly which sensor is being tripped ?

Here's a link that points to a code reader. Might be expensive, but
personally I find knowing what codes an ECU is storing is golden.
Due diligence required to make sure the reader suits your 6.2.
http://forums.iboats.com/bbBoard.cgi...4;gtid=1262518

--Vic

On Mon, 12 Mar 2007 13:46:10 -0600, Vic Smith
wrote:

Might be difficult without the tools. This might interest you.
http://boards.trailerboats.com/cgi-b...c;f=4;t=000248

Is there any diagnostic equipment or process available to find out
exactly which sensor is being tripped ?

Here's a link that points to a code reader. Might be expensive, but
personally I find knowing what codes an ECU is storing is golden.
Due diligence required to make sure the reader suits your 6.2.
http://forums.iboats.com/bbBoard.cgi...4;gtid=1262518

=========================

Good information, thanks.