Hendrik --
Here's the full post -- maybe it will have some helpful info -
how did the fuel become black? it went in clear.
about hour 40 of a nice 80 hour bashing motorsail from zihuatenejo north
to barra de navidad, which should have taken only 40 hours, we
discovered there was a huge dump of black almost carbony looking stuff
from wet exhaust, and much black smoke, no blue tinge from obvious
oil--just plain ol black smoke with higher rpms.
we get into barra and all seems well. oil has been changed and engine is
fine. starts right up and no smoke.... awesome iron kitten.
we go to pull up anchor-- engine is running-- as windlass electric pulls
the rpms rise... remarkably lots--- ok....ok... ok, now is scary...
still rising.
cracked all injectors as the fuel all stop didn't kill the engine. and
when injectors were cracked and no compression any more, blessed silence.
the entire event took less than 5 minutes from onset to silence, and no
detonation or overheat.
whew.
Larry
91 300D
On 7/23/2013 2:48 AM, Hendrik and Fay wrote:
Yes it would help to know the make, did the original poster check the
engine oil level after the engine went 'quiet'?
Did he check to see if there was fuel left in the tank?
My guess is that the fuel rack somehow jammed open onto full throttle
and then it ran out of fuel.
If it is engine oil then his engine is now the anchor.
Hendrik
who has never had a Diesel engine run away but had a petrol one
On 23/07/13 14:53, Fmiser wrote:
Larry wrote:
On a sailboat forum I watch, there was a post from a guy saying
he was moving along under power when the engine went to high rpms
and stayed there until it was quiet - too quiet. I know what
happens when the vacuum shutoff is installed wrong in a W123 240D
but I'm not sure what would cause that to happen while moving
along.
Wow! You really think we are smart! Not even a tip as to the make
or model.
A diesel engine needs fuel, air (oxygen), and heat. The heat is
provided every time there is compression - so that leaves air and
fuel.
Few diesels have any sort of intake throttling so if the engine was
running, it likely has access to plenty of air. That leaves fuel.
The reason for injectors is to control the time and quantity of
fuel - but _any_ fuel in the cylinder can burn, just not as
controlled and as efficiently as when it's injected.
Almost certainly there was a new fuel source. Intake valve stem
leak. Crankcase breather troubles. Propane, gasoline, or methanol
leaking in the vicinity of the air intake. A terr orist spraying
a can of WD-40 into the intake. Engine oil not staying where it
belongs, like a pinhole leak in an oil cooler line. But whatever
the fuel and whatever the source, unmetered fuel in the intake can
easily cause the engine to over-rev. It's harder to over-rev when
the engine is under load because typically the engine will develop
quite a bit less power than it would with properly injected fuel.
-- Philip
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