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Turning Over a Dry Motor #11836491 09/19/16 10:46 AM
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Jigfish Offline OP
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I am by no means starting any [censored] here so don't even go there. This all happens at the weigh-in so the boat is out of the water. At a tournament over the weekend the top 5 has to do a boat check. And one of the things is to pull the kill switch and turn over the motor to make sure it doesn't start. My concern is dry starting my motor. Being a Merc, Yamaha or what ever. Is that doing any damage to the motor, I.e. a dry water pump or anything.


Thanks,

The weak call it obsession, the strong call it dedication!
Jigfish

Re: Turning Over a Dry Motor [Re: Jigfish] #11836512 09/19/16 11:34 AM
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Bobby Milam Offline
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I don't think the slow speed of spinning under a starters power will have any effect. Now if it cranked and was turning at idle speed then I'd be concerned

Re: Turning Over a Dry Motor [Re: Jigfish] #11839646 09/20/16 08:11 PM
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forkduc Offline
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Won't hurt anything as long as it's a quick on and off

Re: Turning Over a Dry Motor [Re: Jigfish] #11840358 09/21/16 02:55 AM
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Dubee Offline
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I wouldn't do it. Back it in the water to start it.

Re: Turning Over a Dry Motor [Re: Jigfish] #11840524 09/21/16 10:50 AM
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Freeman Clark Offline
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Boat checks should be done before the start of tournament.Not after the fact.

Re: Turning Over a Dry Motor [Re: Jigfish] #11840714 09/21/16 01:38 PM
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If you're pulling the kill switch first then it's not going to hurt because it won't start the motor. Compression checks are done all the time like this.

Re: Turning Over a Dry Motor [Re: shotgunwilly] #11840790 09/21/16 02:19 PM
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redchevy Offline
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Originally Posted By: shotgunwilly
If you're pulling the kill switch first then it's not going to hurt because it won't start the motor. Compression checks are done all the time like this.


x2

Re: Turning Over a Dry Motor [Re: redchevy] #11843483 09/22/16 06:51 PM
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rongleaves Offline
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Originally Posted By: redchevy
Originally Posted By: shotgunwilly
If you're pulling the kill switch first then it's not going to hurt because it won't start the motor. Compression checks are done all the time like this.


x2



Exactly my thoughts

Re: Turning Over a Dry Motor [Re: Jigfish] #11844117 09/23/16 01:08 AM
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lakeman Offline
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Are any of you old enough to remember that when most everyone pulled there boat out of the water they would disconnect the gas line and run the motor till it run out of gas ?Have saw it done bunches times,

Re: Turning Over a Dry Motor [Re: lakeman] #11844952 09/23/16 03:45 PM
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Originally Posted By: lakeman
Are any of you old enough to remember that when most everyone pulled there boat out of the water they would disconnect the gas line and run the motor till it run out of gas ?Have saw it done bunches times,


Always did on our 1985 evinrude. Dad would run the gas out of it every time we took it out of the water weather it was going back that afternoon or not. Ran that boat from 1985 till 2014 and never once had a fuel issue with it. It had 95 psi compression when we sold it and would still start on the first crank.

Re: Turning Over a Dry Motor [Re: Jigfish] #11844970 09/23/16 03:53 PM
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bronco71 Online Content
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My worry would not be the motor......it would be the water pump running dry


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: Turning Over a Dry Motor [Re: bronco71] #11845619 09/23/16 11:15 PM
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rb7764 Offline
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The kill switch grounds out the ignition system. If it is working, the motor will turn over at cranking speed, but not start. This will not damage the impeller. If the switch is not working, get it fixed.

Re: Turning Over a Dry Motor [Re: Jigfish] #11845817 09/24/16 02:07 AM
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Team Brown Stripe Offline
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The way Mercs work running a dry impeller will generate heat and damage the impeller. They fit tightly up against the inside of the housing.

I bought this a year ago and it works great.
http://www.ebay.com/itm/151972537148
It says you can run the motor dry for 15 minutes but I wouldn't run it dry any more than you need too. I had this impeller on my workbench for a couple days before installing it and it kept weeping an oily substance.


Youtube video of my tired old fishin motor on the Dyno thumb
https://www.youtube.com/watch?v=RiI-UfMEUw0
www.XtremeMarine.us


Re: Turning Over a Dry Motor [Re: Team Brown Stripe] #11845828 09/24/16 02:13 AM
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Not unless I backed it into the water. I've changed that HPDI impeller enough to know it doesn't take much to lower the water pressure. Most of the time the damage is hardly noticeable. What do you think Yamaha would say if you told them you were cranking it out of the water?


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I hate photobucket.
Re: Turning Over a Dry Motor [Re: Team Brown Stripe] #11845838 09/24/16 02:15 AM
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bronco71 Online Content
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Originally Posted By: Team Brown Stripe
The way Mercs work running a dry impeller will generate heat and damage the impeller. They fit tightly up against the inside of the housing.

I bought this a year ago and it works great.
http://www.ebay.com/itm/151972537148
It says you can run the motor dry for 15 minutes but I wouldn't run it dry any more than you need too. I had this impeller on my workbench for a couple days before installing it and it kept weeping an oily substance.




cool, I've been waiting to see how those work out! I'll probably use one next time I change impellers.


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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