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Turning Over a Dry Motor
#11836491
09/19/16 10:46 AM
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Joined: Feb 2003
Posts: 2,940
Jigfish
OP
Extreme Angler
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OP
Extreme Angler
Joined: Feb 2003
Posts: 2,940 |
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
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11836512
09/19/16 11:34 AM
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Joined: Jul 2014
Posts: 4,340
Bobby Milam
TFF Team Angler
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TFF Team Angler
Joined: Jul 2014
Posts: 4,340 |
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
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11839646
09/20/16 08:11 PM
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Joined: Mar 2007
Posts: 16,323
forkduc
TFF Guru
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TFF Guru
Joined: Mar 2007
Posts: 16,323 |
Won't hurt anything as long as it's a quick on and off
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11840358
09/21/16 02:55 AM
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Joined: Jul 2011
Posts: 5,284
Dubee
TFF Celebrity
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TFF Celebrity
Joined: Jul 2011
Posts: 5,284 |
I wouldn't do it. Back it in the water to start it.
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11840524
09/21/16 10:50 AM
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Joined: Mar 2005
Posts: 1,382
Freeman Clark
Extreme Angler
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Extreme Angler
Joined: Mar 2005
Posts: 1,382 |
Boat checks should be done before the start of tournament.Not after the fact.
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11840714
09/21/16 01:38 PM
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Joined: Jun 2008
Posts: 1,209
shotgunwilly
Extreme Angler
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Extreme Angler
Joined: Jun 2008
Posts: 1,209 |
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.
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Re: Turning Over a Dry Motor
[Re: shotgunwilly]
#11840790
09/21/16 02:19 PM
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Joined: Jan 2005
Posts: 7,485
redchevy
TFF Celebrity
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TFF Celebrity
Joined: Jan 2005
Posts: 7,485 |
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
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Re: Turning Over a Dry Motor
[Re: redchevy]
#11843483
09/22/16 06:51 PM
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Joined: May 2016
Posts: 151
rongleaves
Outdoorsman
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Outdoorsman
Joined: May 2016
Posts: 151 |
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
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11844117
09/23/16 01:08 AM
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Joined: Jul 2005
Posts: 1,887
lakeman
Extreme Angler
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Extreme Angler
Joined: Jul 2005
Posts: 1,887 |
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,
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Re: Turning Over a Dry Motor
[Re: lakeman]
#11844952
09/23/16 03:45 PM
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Joined: Jan 2005
Posts: 7,485
redchevy
TFF Celebrity
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TFF Celebrity
Joined: Jan 2005
Posts: 7,485 |
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.
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11844970
09/23/16 03:53 PM
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Joined: Feb 2006
Posts: 3,738
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,738 |
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
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Re: Turning Over a Dry Motor
[Re: bronco71]
#11845619
09/23/16 11:15 PM
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Joined: Jan 2004
Posts: 2,439
rb7764
Extreme Angler
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Extreme Angler
Joined: Jan 2004
Posts: 2,439 |
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.
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Re: Turning Over a Dry Motor
[Re: Jigfish]
#11845817
09/24/16 02:07 AM
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Joined: Apr 2007
Posts: 2,165
Team Brown Stripe
Extreme Angler
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Extreme Angler
Joined: Apr 2007
Posts: 2,165 |
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/151972537148It 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.
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Re: Turning Over a Dry Motor
[Re: Team Brown Stripe]
#11845828
09/24/16 02:13 AM
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Joined: May 2003
Posts: 16,214
Chris B
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 16,214 |
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?
I hate photobucket.
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Re: Turning Over a Dry Motor
[Re: Team Brown Stripe]
#11845838
09/24/16 02:15 AM
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Joined: Feb 2006
Posts: 3,738
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,738 |
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/151972537148It 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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