Mercruiser 350 Magnum Overspeed Alarm
 

Hello,

We just picked up a new boat with the 350 Magnum engine. The engine now has
only 21 hours on it.

Yesterday, we were going through a no wake area and I pulled the the lever
back to neutral. At that point, alarms started ringing that the engine was
overspeed and need to reduce throttle. A strange alarm when you are at 650
RPM. All other gauges were reading normal, but the engine was running very
rough. It did stall, but after checking all of the fluids and restarting,
it was back to normal.

I'll mention it to the dealer when I get back there, but I wanted to see if
this was a common issue and what the problem might be.

We are coming from a 1990 boat, so we are not used to all of these
electronic system monitors :) Interesting stuff, but I think I preferred
not knowing the GPH fuel use. This engine seems to burn more fuel than our
old 5.7L, 260 HP.

Thanks,
Dave

David Patnaude wrote in message ...
Hello,

We just picked up a new boat with the 350 Magnum engine. The engine now has
only 21 hours on it.

Yesterday, we were going through a no wake area and I pulled the the lever
back to neutral. At that point, alarms started ringing that the engine was
overspeed and need to reduce throttle. A strange alarm when you are at 650
RPM. All other gauges were reading normal, but the engine was running very
rough. It did stall, but after checking all of the fluids and restarting,
it was back to normal.

I'll mention it to the dealer when I get back there, but I wanted to see if
this was a common issue and what the problem might be.

We are coming from a 1990 boat, so we are not used to all of these
electronic system monitors :) Interesting stuff, but I think I preferred
not knowing the GPH fuel use. This engine seems to burn more fuel than our
old 5.7L, 260 HP.

Thanks,
Dave


check all of your battery connections, both at the battery, the
starter and the post on the flywheel housing. if your battery has
butterfly nuts pull them off and throw them into the trash and replace
them with ss nylocks. double check your battery is of the correct
capacity, typically thats 800cca. modern ignition/fuel delivery
systems are voltage sensitive.

(I pulled the lever back to neutral... overspeed and need to reduce
throttle.) Not a good thing to do as you should only put the unit in neutral
when at idle.





"BenC" wrote in message
om...
David Patnaude wrote in message
...
Hello,

We just picked up a new boat with the 350 Magnum engine. The engine now
has
only 21 hours on it.

Yesterday, we were going through a no wake area and I pulled the the
lever
back to neutral. At that point, alarms started ringing that the engine
was
overspeed and need to reduce throttle. A strange alarm when you are at
650
RPM. All other gauges were reading normal, but the engine was running
very
rough. It did stall, but after checking all of the fluids and restarting,
it was back to normal.

I'll mention it to the dealer when I get back there, but I wanted to see
if
this was a common issue and what the problem might be.

We are coming from a 1990 boat, so we are not used to all of these
electronic system monitors :) Interesting stuff, but I think I preferred
not knowing the GPH fuel use. This engine seems to burn more fuel than
our
old 5.7L, 260 HP.

Thanks,
Dave


check all of your battery connections, both at the battery, the
starter and the post on the flywheel housing. if your battery has
butterfly nuts pull them off and throw them into the trash and replace
them with ss nylocks. double check your battery is of the correct
capacity, typically thats 800cca. modern ignition/fuel delivery
systems are voltage sensitive.

"Woodchuck" wrote in
:

(I pulled the lever back to neutral... overspeed and need to reduce
throttle.) Not a good thing to do as you should only put the unit in
neutral when at idle.



That's the point. It was at idle, in forward gear, moving at headway speed.
Another boat slowed in front, so shifted to neutral and the alrms started
going off. The engine was Never overspeed, but that was the alarm.