Engine Overspeed

P

papogator24

New Member
Feb 20, 2007
639
Miami, Fl
Boat Info
2007 240DA - Stolen
5.0L Bravo III
3Kw Westerbeke
Engines
5.0L Bravo III
I had a slight problem going back to my home marina after spending the day on the hook. It had an engine overspeed so I had to limp back home. I have cleaned the strainers and checked the props for any damage and I do not see any obvious bents or so.

What else can I check?
 
1. Sea grass wrapped around the lower unit causing the prop to ventilate. The grass may have fallen off when you stopped and its gone now, so you may have to take the boat out and try to replicate the problem.
2. Spun hub in the prop
3. Spun engine coupler

That is also the most likely order in tems of probablity. Props have rubber bushings pressed into them to protect the internal gears in case you hit something. They will sometimes slip. The engine coupler is made the same way where the splined sleeve is pressed into the housing with a rubber bushing around it.

An '07 is still in warranty ..........all but #1 should be a warranty issue.
 
I think you can eliminate #2 because Bravo3 props do not have rubber hubs.
 
I will go ahead and try to replicate the problem. I believe I might have hit something because I saw the intake scoop on the bottom of the hull for the A/C was slightly bent.
 
Well, I took it out last week on thursday and it ran fine. However, today, when i took it out, for 25 minutes it was running fine, then all of a sudden it had a RPM overspeed and the engine guardian took over. I am clueless on what is going on. I guess I will be calling MM first thing tmw morning. I had to ride out in the storm because I was not going to be able to outrun it. Boy, it was scary in the storm.

I do not see any obvious bent on my props.
 
papogator24 said:
I will go ahead and try to replicate the problem. I believe I might have hit something because I saw the intake scoop on the bottom of the hull for the A/C was slightly bent.
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Wow, saying you may have hit something and the intake is bent is pretty funny when you think about it? How much were you drinking and how shallow were you running when you may have hit something? :smt038
 
Fishnut said:
Wow, saying you may have hit something and the intake is bent is pretty funny when you think about it? How much were you drinking and how shallow were you running when you may have hit something? :smt038
Click to expand...

Sorry, wasn't drinking and I am hearing impaired so it is kind of a challenge for me if I did hit something and I was not able to hear it.


Hampton, not sure what you mean by stuff floats?
 
Did you have the smell of burnt rubber during these "overspeed" conditions? Was your drive trimmed too high?

I ask these questions because the smell of burnt rubber would be an indication your engine coupler is failing. Too much trim on the outdrive will create cavitation and prop overspeed as well. The Bravo 3 does not have a prop hub to fail so it very well may be one of the two problems I mentioned.
 
TurtleTone said:
logs
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Exactly. He didn't have to be intoxicated or in shallow water to hit something that could bend some metal. Water-logged logs have a tendancy to be black and float just below the surface - tough obstacle for even the most seasoned Captain.
 
Dave S said:
Did you have the smell of burnt rubber during these "overspeed" conditions? Was your drive trimmed too high?

I ask these questions because the smell of burnt rubber would be an indication your engine coupler is failing. Too much trim on the outdrive will create cavitation and prop overspeed as well. The Bravo 3 does not have a prop hub to fail so it very well may be one of the two problems I mentioned.
Click to expand...

I did not sense any 'burnt rubber' smell. This was happening while my drive was in the zero position. I have already called MM to come look at it.
 
papogator24 said:
Sorry, wasn't drinking and I am hearing impaired so it is kind of a challenge for me if I did hit something and I was not able to hear it.


Hampton, not sure what you mean by stuff floats?
Click to expand...


I wasn't trying to imply anything although the way your wrote it up it sounded humorous and not knowing your circumstances it wasn't obvious, please accept my apologies. As to floating stuff, I think Hampton means running over things like logs and boards. We have all run over stuff before but usually you have some sense of it when it happens. If the vent was impacted did it also impact your drive I guess is the question?
 
Hampton said:
Exactly. He didn't have to be intoxicated or in shallow water to hit something that could bend some metal. Water-logged logs have a tendancy to be black and float just below the surface - tough obstacle for even the most seasoned Captain.
Click to expand...


A few years ago they had a few thousand telephone poles get loose in upper Lake Michigan. It got dangerous when they got waterlogged and started going vertical.
 
Fishnut said:
A few years ago they had a few thousand telephone poles get loose in upper Lake Michigan. It got dangerous when they got waterlogged and started going vertical.
Click to expand...

I guess so! I was on a charter fishing boat out of Seward, Ak one day when another Captain in our group started screaming on the radio. He was the fleet owner. So, we all stopped in time to begin picking our way through a debris field formed from a 180 degree change in wind direction in previous days. All of the fallen trees that normally gather on the shoreline were blown free to cross the bay. It was kind of erie.
 
Well, just had my boat fixed. It was the water pressure sensor that went bad. The RPM overspeed was coming on because the engine guardian was activated and whenever the RPM would go over 3600 RPM, it will alert you with the overspeed.

They said the sensor might have been corroded or not.
 
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