Damage done?

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robertm
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Damage done?

#1 Post by robertm » Mon Aug 17, 2015 10:19 am

A buddy of mine pulled his pontoon out of the water and hit the master switch to kill the motor. About 2 minutes later he realized motor was still running. Master switch kills everything else but motor. I was at least 100 deg out that day, but the motor was simply idling. Motor is an outboard Yamaha. Damage done?
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illinoid
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Re: Damage done?

#2 Post by illinoid » Mon Aug 17, 2015 10:52 am

My best guess is if it was only 2 minutes at idle no damage was done. Water pump would probably be the first thing to go and since it started wet I wouldn't worry about it if it has good water pressure now. When I did that my 2 cycle Johnson was noisy enough I knew what I had done the minute the motor was out of the water...I pulled up out of the way and redfacedly shut it off...No harm done.
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Tlowry
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Re: Damage done?

#3 Post by Tlowry » Mon Aug 17, 2015 11:15 am

WOW!

And +1 on the impeller, I would replace it.
Last edited by Tlowry on Mon Aug 17, 2015 11:49 am, edited 1 time in total.
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moregooder
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Re: Damage done?

#4 Post by moregooder » Mon Aug 17, 2015 11:25 am

Water pump would be highly suspect. even with starting out wet the impeller is still only mad of rubber

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babock
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Re: Damage done?

#5 Post by babock » Mon Aug 17, 2015 10:12 pm

Check to see if the alternator still works. Running without a load is not a good thing.
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ROLAND
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Re: Damage done?

#6 Post by ROLAND » Tue Aug 18, 2015 1:17 am

Maybe a silly question, but if there were some kind of damage, wouldn't an alarm have sounded before hand?
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Re: Damage done?

#7 Post by rancherlee » Tue Aug 18, 2015 3:24 am

ROLAND wrote:Maybe a silly question, but if there were some kind of damage, wouldn't an alarm have sounded before hand?
Probably not until major damage had happened already, temperature sensor usually need liquid passing by them to be accurate on liquid cooled engines. It takes along time for heat to transfer through the block or head to get where the sensor is with no coolant flow. Also most outboards don't have a Water pressure sensor either which in this case would have been nice as it would have tripped an alarm as soon as the pressure hit zero. In his case 2 minutes probably only will cost him a 50$ water pump impeller. I've messed around with some junk cars and got over 45 minutes of idle time out of an engine without coolant in it!
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Tlowry
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Re: Damage done?

#8 Post by Tlowry » Tue Aug 18, 2015 5:29 am

babock wrote:Check to see if the alternator still works. Running without a load is not a good thing.
Huh???
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babock
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Re: Damage done?

#9 Post by babock » Tue Aug 18, 2015 5:15 pm

Tlowry wrote:
babock wrote:Check to see if the alternator still works. Running without a load is not a good thing.
Huh???
Which part didn't you understand?
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Tlowry
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Re: Damage done?

#10 Post by Tlowry » Tue Aug 18, 2015 5:52 pm

babock wrote:
Tlowry wrote:
babock wrote:Check to see if the alternator still works. Running without a load is not a good thing.
Huh???
Which part didn't you understand?
Well, let's keep this short and talk in layman terms please. Could you explain how running an outboard in the water vs out of the water affects the load on the alternator?
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babock
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Re: Damage done?

#11 Post by babock » Tue Aug 18, 2015 11:36 pm

We are talking different types of loads. Nothing to do with being in the water obviously. By turning off the battery, you have removed the battery load from the alternator. This can cause huge voltage spikes that can damage it.


Never ever ever turn a battery switch to off while engine is running.
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Tlowry
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Re: Damage done?

#12 Post by Tlowry » Wed Aug 19, 2015 5:32 am

I see your point but wouldn't this only be true if the master switch was a Pergo style switch that disconnects the batteries from the motor and the boat?

My older boats master switch disconnects just the boats fuse panel from the battery but leaves the battery connected to the motor and its charging system. This is important if you want to tilt the motor with the master switch off.
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babock
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Re: Damage done?

#13 Post by babock » Wed Aug 19, 2015 9:51 am

Tlowry wrote:I see your point but wouldn't this only be true if the master switch was a Pergo style switch that disconnects the batteries from the motor and the boat?

My older boats master switch disconnects just the boats fuse panel from the battery but leaves the battery connected to the motor and its charging system. This is important if you want to tilt the motor with the master switch off.
On my boat, the master switch is a Perko type switch and it came that way. I know its a hassle but I prefer being able to disconnect all power from the motor. To me. its a safety issue in case something goes majorly wrong. Example...starter solenoid sticking.
Last edited by babock on Wed Aug 19, 2015 10:20 am, edited 1 time in total.
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Re: Damage done?

#14 Post by Bryden24shp » Wed Aug 19, 2015 10:13 am

I saw this happen not that long ago at our boat ramp. Guy drove off with his stern drive running! He was hammered though! I agree, impeller and if parts are missing, back flush the passages. The parts can get caught in the piss tube and t-stats.
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Tlowry
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Re: Damage done?

#15 Post by Tlowry » Wed Aug 19, 2015 10:55 am

Had this happen on a 115 once. Piece of the impeller came off and went into the feed tube to the power head. It restricted the flow to where it would overheat if run on plane for around a mile. Took a while to figure it out cause at slower speeds, I got no alarm.
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