[AT] Firing on two instead of four

[Tim Nobles]

I am moving tractors this morning around for winter storage.  Quickly 
switched the two plugs which were firing with the two that were not. 
Results:  The two good plugs fired in the other holes and the two bad plugs 
did not fire.  So I guess two plugs were fouled.

Tim
----- Original Message ----- 
From: "George Willer" <gwill at toast.net>
To: "'Antique tractor email discussion group'" 
<at at lists.antique-tractor.com>
Sent: Saturday, November 25, 2006 9:04 PM
Subject: RE: [AT] Firing on two instead of four


>
>
> Yoda,
>
> Here's your next step... exchange the plugs of the non-running cylinders
> with the running ones to see if the trouble follows along.  It may work, I
> think it will.
>
> Here's the theory.  Pulling the wire away from the plug forced the coil to
> build to a higher voltage before it fires.  That points to a fouled plug
> even though they're relatively new.
>
> As you may know, a plug under compression needs higher voltage to fire, so
> the test with them laying down outside isn't conclusive.
>
> George Willer
>
>> Hey,
>>     I was playing a short time today with my Case SC which I got at the
>> end
>> of the summer.  It had sat for a few years.  I couldn't get it to fire
>> at
>> first when I picked it up in August, but just put in four new plugs and
>> it
>> ran great.
>>     Anyway, lately it has been running on just two cylinders.  So I took
>> the
>> plugs out and cleaned them and laid each individually down and turned
>> the
>> engine over.  Had strong spark in all four.  But still only running on
>> two.
>> Had a new spark plug wire which I tried and still the two would not fire
>>
>> when tractor was running.  Even switched the good wires to the bad plugs
>> and
>> vice-versa....same results.
>>     My last test was I pulled the wire to the plugs which were not
>> firing
>> off the distributor cap while the tractor was runnining.  As I held it
>> about
>> 1/2 inch from the distibutor, it arced and fired.  Did the same with the
>>
>> other wire which wasn't firing.  Cleaned the contacts and reconnected
>> the
>> wires.  Same old thing.
>>     Suggestions???  Is the distributor bad?  Tried to look close for
>> cracks
>> or wear.  Looking for the next step.
>>
>>     Thanks.  I don't contribute much anymore, but still lurk.
>>
>> Tim Nobles
>> tnobles at netsync.net
>>
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>
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> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
>
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