From: Julian Burke (julian@knology.net)
Date: Tue Aug 26 2003 - 05:48:07 PDT
Hello Bruce,
You have a good idea there when needing the resistor. Plugs only swell
when a higher voltage is applied for too long. I forget the exact voltage
the Wellman plugs were designed for but when that voltage is applied, they
can be left on for all day with no damage at their specified voltage. Also
when engine doesn't start, it is natural for most people to turn off the
ignition and start the process all over again which will cause the
"stacking" I talked about and this is where the glow plugs swell because GM
uses a higher voltage on these plugs to make a faster start. This effect is
for both the CUCV and the Humvee as well. If engine doesn't start the first
time, wait for about 30 seconds until you try to start it again and let the
plugs cool down some. What happens is when you lose one plug, you will get
a "cascade" effect where other plugs will start dropping out at a faster
rate. Takes time but will happen. After losing about 3 plugs, engine will
become harder to start so IT IS A VERY GOOD IDEA when hard starting you
should check the continuity of all plugs and at least make sure you have no
dead plugs. Forget about the resistance value of the plugs; yes they may
have about 1-2 ohms of resistance and I wouldn't worry about that. They are
either GO or NO GO. Just check them with a continuity tester either light
bulb or meter and see if they are open. Julian
> Hi Julian,
> See if my logic is correct in the following:
> I'm thinking that if I put in a wire and a transfer switch so that I can
switch
> manually
> between 12 volt bus and the 24 to 12 volt dropping resistor, then I can
normally
> have
> the 12v bus be the standard for the glow plug system. If I have to get
jump
> started
> by my buddies M988 then all I do is switch to the other position that
selects
> the
> dropping resistor, and away I go.
>
> From what I get from all of this is the problems with the swelling are
derived
> from the
> controller keeping the glow plugs on longer than they need be. This is
caused
> primarily
> from the temperature sensor failing.
>
> Are their other fault conditions typically found in the CUCV controllers
that
> also
> cause this problem, or is this very rare?
>
> What I am getting at is, If the temperature sensor is monitored, maybe
with a
> warning light
> or something, would this eliminate the large percentage of failures? You
> wouldn't happen to
> know how the temperature sensor works? Is it a variable DC signal or does
it
> have to be pulsed
> by the controller, etc.?
>
> Just some of my crazy ideas.
>
> And yes, I would like to get 9 AC60G's from you. I am in Berkeley CA 94703
> So send me the total amount including shipping and handling and I'll send
you
> a check. When you get the money, you can send the plugs. Right now it's
not a
> rush yet...
> Bruce
>
>
> Julian Burke wrote:
>
> > I have all you want for $2.50 each (Humvee standards) Let me know if you
> > need any! Julian
> >
> > > Thanks Julian,
> > > Well for now, since only one of them was bad, I went out to the
GMC
> > Truck
> > > place and got an AC60G.
> > > Hopefully that will last long enough until I can aford to replace the
lot
> > of
> > > them.
> > > Please let me know what you find out.
> > > Thanks,
> > > Bruce
> > >
> > > Julian Burke wrote:
> > >
> > > > There are presently two kinds to use, the gov't Wellmans and
Kascar's
> > "non
> > > > swelling" kind which I'm not real sure about yet until I find out
who
> > made
> > > > them. I'm still trying to do a little research on them but suspect
they
> > are
> > > > bosch. Kascars are supposed to be compatable with other boxes but
you
> > > > might ask them again as Kascar always gives me the runaround trying
to
> > hide
> > > > what he has done! He had KDS engineer this box for them and has
> > exclusive
> > > > rights on it so far. Julian
> > > >
> > > > > Thanks Julian,
> > > > > Either you misunderstood my question, or I am not quite
following
> > you.
> > > > > I figured on keeping the existing controller, assuming it is
working
> > > > correctly,
> > > > > but want to change the current set of glow plugs. Which particular
> > glow
> > > > plug
> > > > > part do you recommend?
> > > > > Thanks,
> > > > > Bruce
> > > > >
> > > > > Julian Burke wrote:
> > > > >
> > > > > > The military only uses only one (Wellman) but with improved
> > controllers.
> > > > If
> > > > > > you want to be safe, spend the $500 or so for the Kascar unit
with
> > the
> > > > plugs
> > > > > > because they are a real pain in the butt if you have to dig out
a
> > > > swelled
> > > > > > one!! If they do swell after that, you can go back on them!
Julian
> > > > > >
> > > > > > > Hi Julian,
> > > > > > > Can you recomend a particular glow plug for the 6.2L CUCV
> > engine?
> > > > > > > Suposedly some are less prone to swelling than others. I am
aware
> > that
> > > > > > > they will all swell under fault conditions, like too much
voltage
> > for
> > > > too
> > > > > > long a
> > > > > > > time.
> > > > > > > I found one bad one today, and figure on replaceing them all
at
> > the
> > > > same
> > > > > > time.
> > > > > > > Thanks,
> > > > > > > Bruce
> > > > > > >
> > > > > > >
> > > > > > >
> > > > >
> > > > >
> > > > >
> > >
> > >
>
>
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