Hi Martin & Josh,
Diesels can also run away on ring blowby as illustrated by this
extreme case in this video:
It starts around 50 seconds. The west coast stoner narrative is kinda
cute too. http://www.youtube.com/watch?v=QEfUblSDzww
People might want to keep a mask & snorkel near whatever air choke
device they decide on.
So as you point out, "it's gonna blow" anyhow... and then it will stop :)
Cheers, Russ
Sweet 35 mk-1
At 09:03 PM 25/05/2013, you wrote:
Content-Language: en-US
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Back in my Merchant Marine school days, during a diesel engine
maintenance class a video was shown detailing what happens when a
large displacement diesel engine runs away, uncontrolled by the
governor as it fed on lube oil through the supercharger seals. Just
before it failed (exploded) you could see fire shooting out between
the block and head.
When attempting to stop a runaway diesel do not place your hand over
the air intake. Use foulweather gear or similar sacrificial air
blocking material that will conform around the air intake. If you
have a Halon (Calypso's engine space has a 7.5lb auto-deploy Halon
system in place) or a larger CO2 extinguisher on board they may be
used to slow the engine slightly to make the stopping easier.
This sort of failure is rare in small auxillary diesel engines, but
more likely with turbocharged engines. If a pleasure boater (power
and sail) does basic maintenance (do not over fill the lube oil) and
every few years calls in an expert to check the more complicated
systems (especially the injection pump, head bolt torque, and turbo
seals) the risk of runaway should continue to be small.
Martin
Calypso
1970 C&C 43
Seattle
----------
From: CnC-List [cnc-list-boun...@cnc-list.com] on behalf of Josh
Muckley [muckl...@gmail.com]
Sent: Saturday, May 25, 2013 7:16 PM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Fwd: Stopping a diesel
So let me get this straight:
Run away engine - gonna blow. Decompress - gonna blow
Sounds like a dammed if you do dammed if you don't.
So don't decompress. Good to know for the normal "non-emergency"
shutdowns. I'm still gonna do it when shutting of the fuel and air
don't kill the engine.
Thanks for checking me and the books,
Josh
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