[AT] Never Heard Such a Bang!

Spencer Yost yostsw at atis.net
Wed Feb 27 18:38:56 PST 2013


The advance in your mag/distributor is misbehaving my guess. That would explain the bang during hand starting and fouled plugs.

Just a theory,

Spencer

Sent from my iPhone

On Feb 27, 2013, at 21:19, Ben Wagner <supera1948 at gmail.com> wrote:

> Hello,
> 
> It's been awhile since I've had to ask a question on here. Incidentally, 
> the question is on the tractor I was always bothering everyone about a 
> few years ago, my 1948 Farmall Super A.  Since that restoration, I have 
> completed restoring/rebuilding everything from Gravely walk behinds, to 
> Clinton equipped lawn mowers, to Ford tractors, and now even John Deere 
> two cylinders.
> 
> All of that to say is even after all of that antique repair work, I am 
> stumped on my Super A once again.  It's a long story: bear with me and 
> maybe I'll give the right information that will help someone diagnose 
> the problem.
> 
> About a week ago, the Super A had been running for about 20 minutes.  I 
> had it pushing in a John Deere M that I was rebuilding. I stopped to 
> kick the block from under the Deere, while the Super A was running about 
> 3/4 throttle, with a snow blade, so there was load on the Touch 
> Control.  I got back on the A, and gave it a little throttle to push the 
> Deere.  From the three seconds I had gotten off and back on the Farmall, 
> it suddenly had no power.  As in nearly stalling while moving in first 
> gear down a slope.  I cut it off and replaced the D21 plugs with fresh.  
> It ran much better, well enough to push in the Deere (which was quite a 
> load) and even scurry down the road in high gear.  It was still 
> sputtering slightly, but it had power.
> 
> I pulled the Farmall out a day ago to (once again) move a tractor. It 
> started immediately, I am hand cranking, but it had no power, once 
> again.  It died while I was trying to ease it into an area where I could 
> work on it.   It wouldn't start back up.
> 
> I tried to start it today, cold, and all I got after four hand cranks 
> (choke at 1/2 like always) was one loud bang in the muffler/manifold.  
> Enough to loosen the muffler from the exhaust pipe!  No backfire, but 
> just one loud bang.  The engine didn't even try to start.
> 
> I have checked timing.  Everything is in tip top shape.  All the valves 
> are free and adjusted properly.  The carburetor is spotless: good fuel 
> flow, no junk in the lines, clean jets.  It is a Zenith with no high 
> speed adjustments.
> 
> So the question is, what does the problem seem to be?  I have worked on 
> quite a few engines (but not as many as the folks on this list) but I've 
> never heard such a bang without a hot engine and too much choke!
> 
> Thanks in advance for your help!
> 
> Ben Wagner
> 
> -- 
> www.oldpathsequipment.com
> Mt. Solon, Virginia
> Antique Machinery Repair and Restoration
> 
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