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


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Old 04-26-2013
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Can a Diesel be Flooded with Fuel?

Hello All
I am new to sailboat ownership and just took my first outing on the O'Day 322 which we just purchased. The Yanmar 2GM was very difficult to start. Thanks to some good advice on this site, I knew enough to shut the raw water intake after a couple of failed attempts to start. I had read that she would start best with 3/4 throttle. After a couple of coughs and almosts...she belched a bit of smoke into the engine compartment. I let her sit for a few minutes, then tried again with 1/4 throttle and she came to life and ran normally. My question is can a diesel be flooded with fuel? When she did start, when the raw water was opened, she blew out a slug of black water, then cleaned right up...
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Don
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Old 04-26-2013
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Re: Can a Diesel be Flooded with Fuel?

If it cleaned right up (the discharge water) I suspect it was just a load of soot in the exhaust.
Soot is unburned fuel in your exhaust system/water muffler - in this case most likely caused by running too rich (like under prop'd).
Black smoke is too much fuel, white is too much air, and blue is burning oil (general statements that hold up in 99 percent of circumstances).

Start at 1/4 throttle not 3/4 in neutral - and only if cold.
I keep the raw water open, but only crank for 5-10 seconds, pause, try again. After 3-4 tries if it doesn't start wait a minute and let the starter cool and the water drain.

I never crank with the water closed - that's the best way I know of to kill an impeller.
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Old 04-26-2013
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Re: Can a Diesel be Flooded with Fuel?

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Originally Posted by Invictus322 View Post
My question is can a diesel be flooded with fuel?
Don
Most definitely Yes! I can attest to this with (3) bent con rods..confirmed by Mack Boring upon tear down. If you have compression release(s) use 'em and 'kill' the fuel and crank the engine a couple of times as a precaution if after unsuccessful starts.

Fuel is about UN-compressible as water..
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Old 04-26-2013
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Re: Can a Diesel be Flooded with Fuel?

They can also "run away" from having too much fuel ingested, "BOOM""



"Action" starts at about 1minute and 30 seconds

Paul T

Last edited by dabnis; 04-26-2013 at 10:45 AM.
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Old 04-26-2013
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Re: Can a Diesel be Flooded with Fuel?

Diesel runaways are scary. My father will tell of the time in 1970 on the USS Holland when he was cheif engineer. One of the new guys was starting up a generator, a "rock crusher" with an upper and lower crankcase. you had to fill the sump on the upper crankcase before starting so the bearings would not run dry before the oilpump started to supply pressure.

New guy has his finger on the fill button while talking and overfills the engine. On start up, all the excess oil gets pulled into the combustion chamber and when they went to pull the emergancy air cut off.. the flaps broke.

All they could do was evacuate the engine bay and wait for the engine to explode
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Old 04-26-2013
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Re: Can a Diesel be Flooded with Fuel?

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Originally Posted by chucklesR View Post
I never crank with the water closed - that's the best way I know of to kill an impeller.
I, on the other hand, do crank with the water closed on occasion, and I haven't seen any impeller damage. We're only talking a few seconds, and I don't think it is even dry that whole time.
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Old 04-27-2013
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Hmmm, impeller starting at $20 or engine starting at $7,000?
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