From: Marc Strangfeld (mjstrangfeld@yahoo.com)
Date: Sat Jun 11 2005 - 22:33:20 PDT
I can agree with what Jim said.
I ran an old Autocar with a 855 block Cummins for a
few days last year and had a problem when backing up.
It would surge and I'd have to totally back out of it
and start over otherwise it would speed up to no end.
I told the owner of the truck about it and he just
shrugged it off so maybe it is a common problem.
As far as Joe's problem, I'd call a diesel shop and
talk to the most senior man there, you'd think with a
zillion 250 Cummins out there some old mechanic could
diagnose it as easy as reciting the alphabet. "oh
yeah, there was a service bulletin on that in 78',
here it is tacked on the wall yet"
Thanks for posting Jim, now I can finally get some
sleep.
Marc
--- James Shanks <n1vbn@yahoo.com> wrote:
> Joe,
>
> Cat, Mack, and Detroit engine all will hold a
> given speed by cranking out the manual throttle.
>
>
> A Cummins is a horse of a different color
> however, it REQUIRES a special governor attached
> to the fuel injection pump to precisely control
> rpm's on a Cummins for fixed speed applications
> say driving a compressor to unload a dry load of
> Cement. Now you know why Mack and Cat's are so
> popular for those trucking hauls.
>
> What you described below is normal for any
> NTC-855 Cummins engine with straight mechanical
> fuel injection IE: no electronic controls save
> the shutdown solenoid. In winter all you need to
> do is increase rpm a total of 50 RPM to keep the
> engine warm down to 50 Degree's below zero (MY
> personal expierience driving an 18 otr)Go up to
> any driver driving a Older NTC engined truck and
> ask him if he can hold a set speed in neutral
> with his foot or hand throttle and I'd bet money
> on he'll state once your past 50 RPM it will just
> keep on climbing till it hits governor setting.
> Yours should top out at 2250 RPM petal to the
> metal in neutral. That gives you a working limit
> of 1500-2100 RPM. If your RPM exceeds this
> setting ( it will be noisy as all get out but you
> will notice power fall right off.
>
>
>
> --- joeyounginc@aol.com wrote:
>
> > If I can get this Cummins back to normal just
> > by adding some
> > oil to the fuel, I'll be a very happy man!
> > That's the kind of
> > fixes I like.
> > Sitting here this morning, I recalled another
> > quirk with this
> > motor. Every time after starting it and bumping
> > the manual
> > throttle up some, it would start to increase
> > rpms. A slow
> > but gradual increase to the point I'd have to
> > run over to
> > the truck and knock the throttle back to idle.
> > It'll sit there
> > and idle without a problem, but bump it up a
> > few hundred
> > rpm and off it will go. I never had a problem
> > driving it after
> > a warm up, though now I'm worried. I don't
> > wanna be the
> > person that sets the land speed record for
> > crossing a corn
> > field or housing development :)
> > Thanks for the suggestion and explanation.
> > Joe Young
> >
>
>
> James Shanks
> 85 M-1009
> 98 IMZ 8.103
>
>
>
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This archive was generated by hypermail 2.1.4 : Fri Oct 28 2005 - 22:47:28 PDT