[AT] Never heard such a bang

[Dean VP]

Here is a link to the IH magneto info:

http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-5035%20Service%20Ma
nual%20Magnetos/index.html



Dean VP
Apache Junction, AZ

"If you put the federal government in charge of the  Sahara Desert , in five years there'd
be a shortage of sand."     
~ Milton Friedman


-----Original Message-----
From: at-bounces at lists.antique-tractor.com [mailto:at-bounces at lists.antique-tractor.com]
On Behalf Of Dean VP
Sent: Monday, March 04, 2013 9:31 PM
To: 'Antique tractor email discussion group'
Subject: Re: [AT] Never heard such a bang

I too would recommend focusing on anything associated with the Magneto/Distributor.  Let's
say it is a Magneto. Is it possible that the mechanism inside the Magneto that is supposed
to lag the spark by 20 some degrees when cranking the engine at slow speeds is stuck and
not doing its job?  I believe you mentioned in an earlier message that you got a spark at
TDC. That isn't right unless it is running at a fairly high speed.  The spark should be
retarded at slow speeds to avoid the very thing you are having.  The spark should occur
several degrees past TDC when cranking.  Check your Operators or Service Manual as to what
the correct timing should be and what the lag angle is supposed to be. 

Dean VP
Snohomish, WA

"If you put the federal government in charge of the  Sahara Desert , in five years there'd
be a shortage of sand."     
~ Milton Friedman

-----Original Message-----
From: at-bounces at lists.antique-tractor.com [mailto:at-bounces at lists.antique-tractor.com]
On Behalf Of jtchall at nc.rr.com
Sent: Monday, March 04, 2013 8:18 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Never heard such a bang

Haven't been following things closely but Dave may have hit on the problem. 
If the problem developed suddenly, maybe some gears in the valve train decided to go--Only
ran into that once and it required all of them to be replaced. Has the magneto or
distributor gotten loose and rotated? If you have a magneto, there is a possibility the
phenolic gear inside has broken a tooth causing the rotor to be out of time. In the
process of working on it have you fixed the problem but while checking ignition, crossed
the wires?

John Hall


-----Original Message-----
From: Dave Rotigel
Sent: Monday, March 04, 2013 9:46 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Never heard such a bang

Ben, Are you holding your tongue correctly?
Dave
PS, Is the rotor broken?
PPS, Is the timing correct?

On Mar 4, 2013, at 9:25 PM, Ben Wagner wrote:

> Here's today's update on the Super A: I have ruled out now:
>
> ~Valves. Adjustments are correct, compression is fairly equal (+/- 5) 
> across all 4 cyls.
> ~Fuel.  All new fuel in the tractor.  All I get now is a bang a bit 
> sooner!
> ~Spark. Jumping a 1/4 air gap with no problems at the plug.  New spark 
> plugs.
> ~Carburetor.  Nothing changed: cleaned and checked for blockage.
> ~Air bath.  Changed oil and checked to verify screen is clean.
>
> I'm not done yet, but I am getting desperate.  All of us easterners 
> will be receiving a snowstorm on Wednesday: I need a snowplow 
> tractor!!  I'll keep everyone posted.
>
> Ben W.
>
> www.oldpathsequipment.com
> Mt. Solon, Virginia
> Antique Machinery Repair and Restoration
> 

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