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Daniels wc 
Silver Level
Joined: 16 Jul 2017
Location: Iowa
Points: 88
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 Topic: c smokeing and back fireing
Posted: 03 Dec 2018 at 10:15pm |
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Was wanting more incite why would a tractor spits spuders back fire and smoke. I am working on an allis charmers c,it had the engine tore part when I got it. I was told that it had all of the symptoms. Above and whounder what might cause that
Thank you Daniel
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B26240
Orange Level
Joined: 21 Nov 2009
Location: mn
Points: 3866
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Posted: 04 Dec 2018 at 6:33am |
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Can be lots of things but you got to start somewhere so I''ll say check the spark. Must have bright blue spark at the right time including plug wires on in the correct order.
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Jim.ME
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Joined: 19 Nov 2016
Location: Maine
Points: 973
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Posted: 04 Dec 2018 at 7:12am |
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I guess I'm not clear on where you are at. Is it still apart or have you put it back together and started it? How far "torn apart" was the engine? What is/was the condition of the internals? If you reassembled the engine what did you do to it for machine work are parts? If the engine is still apart are you asking what you should look for/at with the engine apart, that might have caused the symptoms?
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22825
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Posted: 04 Dec 2018 at 2:28pm |
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2 plug wires switched around can do that.
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Daniels wc
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Joined: 16 Jul 2017
Location: Iowa
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Posted: 04 Dec 2018 at 2:52pm |
NO that means that someone tore the engine apart probably becuse 2 plug wires were mixed up so frustrating 
Thank you for the help Daniel
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HoughMade
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Joined: 22 Sep 2017
Location: Valparaiso, IN
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Posted: 04 Dec 2018 at 3:08pm |
How far is it torn down?
If it's backfiring through the carb, I think timing. If it's not truly firing through the carb, but hitting at a weird time and running rough, I think timing, spark or carb. Could also be a valve.
If the head's just off and it rotates free and the cylinder walls don't look bad, personally, I would make sure the valves were good, probably lap them, install the head, put everything together correctly with a clean carb and known good mag (or distributor and coil) and see what happens.
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1951 B
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 04 Dec 2018 at 3:39pm |
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Points and condenser quality isn't what it used to be. A bad condenser will make them run bad and back fire. Also look at the distributor. If the shaft has play in it, your spark timing and dwell will not be consistent. Check the advance mechanism. The shaft will turn a little one way and spring back. When you set the timing it's done at full throttle and not idle speed. Also remember the firing order is 1,2,4,3 and NOT 1,3,4,2.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 04 Dec 2018 at 4:43pm |
The shop manual may have hints on trouble shooting and for sure details of timing both valves and ignition. http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf Gerald J.
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