[AT] Ford 4000 Quitting Afer Running a While

[charlie hill]

Yes it probably does within reason Alan but I've been down this same road 
several times over the
years and when my tractors start having these symptoms and the choke helps I 
know it's in the carb.
If the choke doesn't help it's in the firing somewhere.  I haven't seen or 
heard this tractor run
so I'm not saying I'm right about it.  It's usually not a coil.  Most coil 
problems that you would notice
with a slow turning tractor engine are fatal. It just quits.  The stories 
you hear about an engine "blowing the
fire out" are high RPM, high horsepower engines under a lot of load.  If 
it's electrical the first place I would
look is points and condenser and all of the ignition wiring (switch, wires 
from the battery to the switch, wires from
switch to the coil, wire from coil to points) and all of the connections on 
those wires.  Get a roll of automotive wire
and some squeeze on connectors and start replacing them.  It's often easier 
to replace them than it is to check them.

If it is the coil there is an easy way to check it with an ohm meter.  Look 
it up on line.  There is a resistance
range in the primary and in the secondary windings of the coil.  Just check 
with the coil disconnected across those
windings and if it's out of range it is bad.  The range is the same for most 
all automotive coils but I don't remember
what it is.  Check for loose or broken wires or loose fasteners.

Charlie



-----Original Message----- 
From: Alan Nadeau
Sent: Sunday, July 14, 2013 1:33 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Ford 4000 Quitting Afer Running a While

Charlie,  not trying to disagree with you but doesn't a rich mixture light
easier?  From playing around with economy measures in his cars, back
during/after the '73 gas crunch, a friend of mine pretty much established
that a lean mixture required a hotter spark and the inverse was true as
well.

With that in mind enriching the mixture would let a weakening coil to
produce enough spark to light that richer mixture.

I'm not much of a fan of diagnosing by throwing parts at a problem but, in
this case, knowing nothing positive about when this machine last saw service
I am leaning towards refreshing the ignition system and eliminating that
from further consideration if the problem persists.

What is the likelihood of an ignition switch developing high resistance and
lowering voltage to the coil?  If I could reach the switch I would be
inclined to see if it gets hot after running for a while.  From what I can
see the only way to reach the switch is to remove the dash panel.   That
becomes a bit of a big deal for me as I have only partial function in my
left hand, making it hard to deal with fasteners that are hard to get at.

Where do you check resistance on a coil?  I have a good meter and now I'm
getting curious about any difference in resistance between cold and hot
conditions at the coil.

Keep the dialog coming.

Al


----- Original Message ----- 
From: "charlie hill" <charliehill at embarqmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, July 14, 2013 12:06 PM
Subject: Re: [AT] Ford 4000 Quitting Afer Running a While


> No doubt a bad coil will cause that problem but if pulling the choke
> closed
> makes it
> run better it's not the coil.
>
> Charlie
>
> -----Original Message----- 
> From: Greg Hass
> Sent: Saturday, July 13, 2013 11:25 PM
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] Ford 4000 Quitting Afer Running a While
>
> My brother had a gas combine once that did the same thing . Called out a
> mechanic who tried several things over a 4 hour period before replacing
> the coil; problem solved.
>    Greg Hass
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