[Farmall] Never heard such a bang

[Barney Van De Weert]

I'd still suspect the coil, also any chance you have wires that could be cross firing if they are touching. Doubble check the firing order especially the rotation of the the rotor. I'm thinking the cap may be numbered so they should be right. I wired one backwards once and had a big bang out of it.
 
Barney Van De Weert


________________________________
 From: Ben Wagner <supera1948 at gmail.com>
To: Farmall/IHC mailing list <farmall at lists.antique-tractor.com>; Antique tractor email discussion group <at at lists.antique-tractor.com> 
Sent: Friday, March 1, 2013 5:30 PM
Subject: Re: [Farmall] Never heard such a bang
 
Here's where we are at now: I dropped my spare H4 (with a new condenser) 
which throws a nice hot spark on the tractor.  Nothing: I gave up 
cranking after nearly wearing my arm off!  So I bit the bullet and 
rebuilt the original magneto: no condenser, new points.  New distributor 
cap.  The magneto is still throwing a quarter inch spark with no 
issues.  After reinstalling it, this time I received a bang.

The timing is perfect: magneto impulse fires #1 terminal on the cap at 
exactly TDC.

I took the carburetor apart, again.  Everything is squeaky clean. This 
is a Zenith 11115B: no main jet adjustment.  The bang proves I am 
receiving fuel into the engine.

Valves are still good.  I double checked them all.  No bent pushrods, 
either.

So I'm leaning towards spark.  I'm trying to decide what would burn 
up/break while the tractor is running, which would reduce power, then 
suddenly not allow it to start at all.  I'm thinking that I should at 
least get it to run (but maybe not well) even if the coil was bad.  It 
is throwing a spark all the time while I am cranking the engine.

Any thoughts?  Thanks for helping solve this problem... I'll be glad to 
hear this creature run again!

Ben W.

www.oldpathsequipment.com
Mt. Solon, Virginia
Antique Machinery Repair and Restoration

On 2/28/2013 3:15 PM, Brian wrote:
> Sounds like moisture in the distributor cap causing a cylinder to fire at the wrong time.
> _______________________________________________
> Farmall mailing list
> http://www.antique-tractor.com/mailman/listinfo/farmall

_______________________________________________
Farmall mailing list
http://www.antique-tractor.com/mailman/listinfo/farmall