Hi All,
I have (beside my MV's) a '55 Peterbilt conventional with a Cummins NH220
diesel
engine. This engine has a decompression handle, it can be used when starting
the engine.
Just pull the handle while cranking the starter engine, so the starter
engine has an easy job.
After a few turns you can pull the handle back and the engine fires up.
Could this decompression handle be used against a runaway of the engine??,
In theory
the handle takes the compression off the engine.
Thanks!
Auke Dijkstra
Netherlands
-----Oorspronkelijk bericht-----
Van: DDoyle9570@aol.com <DDoyle9570@aol.com>
Aan: Military Vehicles Mailing List <mil-veh@mil-veh.org>
Datum: vrijdag 30 maart 2001 3:51
Onderwerp: Re: [MV] runaways
>While on the subject of runaways, there is something that has been
>missed....I am telling this from memory, not the manual, so, while the
>principle is correct, the numbers may not be exact.
>The military multifuel engine is governed to 2800 RPM (could be 2600, again
>this is from memory), ASSUMING the governor is working correctly, the
>injection pump will not pump enough fuel to blow the engine up, REGARDLESS
of
>the throttle setting. In fact, either the injector or engine manual tell
you
>top operate the engine at full throttle with no load for so many minutes as
>part of the break in procedure.
>Now, if the governor section of the injection pump has failed, you can blow
>the engine up, even if the throttle works properly, simply by mashing the
gas
>too far.
>As some one else has already mentioned, the most likely way to blow the
>engine up is by introducing fuel from a source OTHER than the injection
pump.
> Crankcase oil is the most likely source of this outside fuel. When faced
>with this situation there is NOTHING you can do to the fuel system to shut
>the engine down, as the fuel causing the runaway is not going through the
>injection pump or any other part of the fuel system. The only practical
way
>to shut it down is shut off the air. (you MAY be able to choke the truck
>down by putting it in high gear, high range and releasing the clutch) One
>way to shut off the air is by slapping a board over the air intake(s),
>another way is to discharge a 15 pound CO2 fire extinguisher into the air
>intake. The key under either method is that the engine MUST completely
stop
>revolving. If you run out of CO2 before it quits turning, or move the
board
>it will start all over again.
>Hope this helps,
>David
>
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This archive was generated by hypermail 2b29 : Wed Apr 04 2001 - 08:10:49 PDT