Motor Drainage in Freezing Conditions

MTFishGuy

Cadet
Joined
Apr 11, 2004
Messages
27
Hello folks,<br /><br />Question for you. I often fish in conditions early and late season when the night temperature drops well below freezing, even though the day time temps are acceptable for boating. I always stand my outboard upright, using the tilt hydraulics, while rigging for road travel at the boat ramp to drain the water out of the engine. My question, do you recommend "tapping" the starter (without starting the engine) to turn the motor over and expell any internal water? Have heard this is a good thing to do to get water out of the water pump/impeller area that may freeze, expand and do damage to that unit. The owner's manual (Mercury 4 stroke) says to never turn over the engine without water going into the intake. Does that include when temperatures may later drop to well below freezing?<br /><br />Thank you for your input.<br /><br />Tight lines.
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Motor Drainage in Freezing Conditions

Do it. Wait until the motor stops draining or the water will just get back in. Don't start it, just turn it over. Water will be expelled without actually starting it. Even if it starts, as long as you shut it off right away you'll be okay. The pump should self-drain, but it could begin to freeze first and leave some water in there. Not so much a problem until you try to restart when it's frozen and rip the impeller vanes off.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Motor Drainage in Freezing Conditions

Depends on what model you have. It is almost impossible to turn over an EFI 4 stroke without it at least trying to start. Just be sure you turn the key off quickly.
 

ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
Re: Motor Drainage in Freezing Conditions

What JB said.If you have a later model 2 stroke with remote throttle controls,you can pull the lanyard kill switch before cranking.
 

Major Woods

Petty Officer 1st Class
Joined
Jun 7, 2001
Messages
317
Re: Motor Drainage in Freezing Conditions

I boat every weekend all year here in CT, down into the single digit temps.<br />Your motor is self draining and does not need to be tapped. Allow a couple minutes for the motor to drain in the down position and then tilt up for travel from the launch.
 

MTFishGuy

Cadet
Joined
Apr 11, 2004
Messages
27
Re: Motor Drainage in Freezing Conditions

Thanks for the info. I haven't been tapping it, just letting it drain in the fully upright position (it is the EFI 4 stroke model). Haven't had a problem. But a buddy suggested I do this and thought I would see what others had to say on the issue.
 
Top