[Vwdiesel] OT, problem with a different diesel engine

[David Cook]

No, the trans basically determines the top speed
before the governor has a chance.  The engine usually
winds out at about 62-63 (unless there is a hill...)
while the governor is at about 66-67.

Also, if I let it slow down to say, 45 and accelerate
back up to 60, it will make that noise the whole way
up.

David


--- gary <gbangs at cfl.rr.com> wrote:

> Governor cutting in?
> 
> -Gary
> 
> David Cook wrote:
> > Hey all-
> > 
> > My school bus exhibited a couple strange symptoms
> > while on a field trip tonight.  I was wondering
> your
> > thoughts before I mention it to the mechanics.  (I
> > want to look smart!  Well, that and I am just
> really
> > curious.)
> > 
> > Anyway...
> > 
> > The bus is a '94 model International turbo diesel
> > engine, it has no computer controls or anything
> like
> > that.
> > 
> > If I'm driving along really pushing it, the engine
> > will start making a rattling noise.  It is such a
> > rattling noise that at first I thought it was the
> door
> > handle rattling.  
> > 
> > It will rattle for a half second or so, then stop
> > briefly, then rattle again.  Like
> > "da-da-da-da-da...da-da-da-da-da...etc"  When it
> is
> > rattling, I notice a very slight reduction in
> power,
> > though the bus doesn't really slow down.
> > 
> > Also, during a time it is doing this, I have
> noticed
> > that accelerator pedal action is delayed.  I mean,
> if
> > I press the pedal down, it will act like it didn't
> > know I did that for about half a second or so. 
> And
> > then, if I let up on the pedal, again there is
> about a
> > half second or so delay before the engine speed
> drops.
> >  
> > 
> > The pedal itself still moves smoothly.
> > 
> > The really odd thing is that the bus has to be
> driven
> > for a long time before this happens--at least
> about an
> > hour.  I can drive it as hard as I want for up to
> > about an hour before it will start making this
> noise.
> > 
> > Today, after my afternoon route, I took an
> athletic
> > trip.  After driving the afternoon route with no
> > issues, we took off for the athletic trip. 
> > 
> > It wasn't very long before the rattling started. 
> At
> > one point, we came to a stop light.  I slowed down
> > slowly, and put it into neutral as we approached
> the
> > light.  The engine stumbled just a tad-dropped to
> > slightly lower than normal idle speed-for a second
> or
> > so, then settled at normal idle speed.  
> > 
> > After the light changed, I took off again.  We
> drove a
> > few minutes  before it started rattling again.  As
> we
> > came to an on-ramp, I put it in neutral again to
> see
> > what would happen.  To my surprise, the engine
> > immediately died, but started up again.
> > 
> > At the next stop (a few miles of rattling down the
> > road to get on another highway) I again let it
> slow
> > down slowly, then put it in neutral as we waited
> at
> > the stop sign.  It idled normally.
> > 
> > On the new highway, I decided to not push it as
> hard,
> > and kept it right at about 55 mph.  We went the
> whole
> > rest of the trip (about 45 minutes) with no
> rattling.
> > 
> > I decided to do an experiment on the way home.  As
> we
> > got on the highway, I drove pedal to the metal the
> > whole way.  
> > 
> > It was a whole hour before it started rattling.
> > 
> > The reason I ask is that this seems so odd to me,
> the
> > fact that it has to have driven so long before
> acting
> > funny.  Its not like it just waits until the
> engine
> > warms up or something, obviously the engine has
> been
> > at full operating temps for a very long time by
> the
> > time this happens.
> > 
> > Anybody have any ideas?  Again, the engine is all
> > mechanical, as in no computer controls.  It also
> has a
> > 4-speed allison auto trans.
> > 
> > Thanks,
> > 
> > David
> > 
> > David Cook
> > Red '86 Cabriolet Diesel Powered
> > Red '90 g60 Corrado 
> > Brown and White '78 Westy Campmobile "Bear"
> > and others in various states of disrepair
> > Pictures here:
> community.webshots.com/user/superdave5599
> > 
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> > 
> 


David Cook
Red '86 Cabriolet Diesel Powered
Red '90 g60 Corrado 
Brown and White '78 Westy Campmobile "Bear"
and others in various states of disrepair
Pictures here: community.webshots.com/user/superdave5599

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