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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 11-25-2013
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Cold start yanmar 2gm

Hey, how does one go about starting a cold 2gm yanmar, weathers been cold, whats the best way to get running so I can go get hauled out,
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Old 11-25-2013
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Re: Cold start yanmar 2gm

if you have a propane torch, remove the air cleaner and direct the flame into the intake while someone cranks the engine with the starter. have the throttle about 3/4 open . cut it bach when the engine starts. warming up the intake air helps the injected diesel to fire.
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Old 11-25-2013
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Re: Cold start yanmar 2gm

Don't set your boat on fire. Place a hair blow dryer in the engine compartment aimed at the intake manifold for about 10 min , should start like a warm engine.
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Old 11-26-2013
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Re: Cold start yanmar 2gm

I wonder if anyone makes block heaters for marine engines? Pretty common accessory for automotive engines in Northern latitudes.
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Old 11-27-2013
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Re: Cold start yanmar 2gm

very cold engine block heater battery heater. Otherwise crank wait twice as long as
crank , crank again. Do not use engine desil starting fluids, either, bad for engine.
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Old 11-27-2013
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Re: Cold start yanmar 2gm

If you're cranking a lot, and in the water.. be sure to close the raw water intake until the engine starts or you may backflood the engine and hydrolock it.
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Old 11-27-2013
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Re: Cold start yanmar 2gm

Use a portable hair drier to pump hot air into the intake spout on the air cleaner for a few minutes before cranking (or even while if you've got a helper to turn the ignition switch). If you don't have shore power use a 12v version.




Operated for a few minutes, it would not be an undue drain on your batteries unless they are way down. See
Amazon.com: RoadPro RPSC-818 12V Hair Dryer/ Defroster with Folding Handle: Automotive Amazon.com: RoadPro RPSC-818 12V Hair Dryer/ Defroster with Folding Handle: Automotive


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Old 11-27-2013
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Re: Cold start yanmar 2gm

If the engine has glow plugs, they may be on a timer, only allowing a short heat cycle? You could extend the time by jumping directly to the plugs for a SHORT period of time, maybe 10 extra seconds or so.

Paul T
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Old 11-28-2013
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Re: Cold start yanmar 2gm

I have a 2QM15- no glow plugs on this model- that was very hard on the starter motor when cold.
I bought a Wolverine brand engine heater that you affix to the bottom of the oil pan with an expoy that is included in the kit. Website is wolverineheater.com - For my 2 cylinder I bought the model 4.5 CSA approved ( gotta keep the insurance company happy) that is 50 watts. I think its the smallest one they make.
Now no matter what the outside temp the engines starts with a couple of seconds cranking at most. I figure the $60.00 cost of the heater has paid for itself many times over with the reduced wear on the starter motor.

They are mfg'd in Washington state, but I believe they have dealers everywhere. - I have no connection with this company at all, just a satisfied customer.

There are some Canadians who would argue that it never gets cold enough to use such a thing in Victoria BC, but things come to a screaming halt around here when it hits 0 C! brrr!
Faster and fryewe like this.
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Old 11-28-2013
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Re: Cold start yanmar 2gm

I always seem to be one of the first boats to be hauled, meaning first thing in the morning when it is cold! The last two years, I have run an electric heater pointed at the engine for an hour before it is time and this makes a huge difference. Launch is another story because I can't get power to the boat immediately before launch. I fhave found that cranking it a bit and then waiting for a good 15-20 seconds, cranking again for a short period of time...wait and it will go the third time.
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