[Farmall] Never Heard Such a Bang!

[Tractorman453657 at aol.com]

I had the same problem last year on a A. It was a exhaust  valve stuck 
open. In my case it blew the manifold into pieces. It wasn't much  good anyway 
and  needed replaced.
 
 
In a message dated 2/27/2013 9:46:25 P.M. Eastern Standard Time,  
supera1948 at gmail.com writes:

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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