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B is backfiring after sitting three years, what may be the cause?

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aaron

11-24-2002 17:24:46




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Hello,
I am working a deal to buy a 1938 Allis Chalmers B. It sat for three years and the owner put diesel in the cylinders to free the pistons, then waited 3 weeks. Then he tow started it. He put new plugs in and it runs but backfires. Any thoughts? Oh yeah, it has a magneto.
thanks,
-aaron




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Dennis Benson

11-26-2002 16:47:54




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 Re: B is backfiring after sitting three years, what may be the cause? in reply to aaron, 11-24-2002 17:24:46  
If I remember right, the cumbustion chamber is deep enough so that the pistons won't hit the valves and bend them. But, like the others said, the valves are probably rusted into the guides, which would bend a push rod. Also, if it rusted as much as it sounds like it rusted, then it was rusting on the crankshaft journals, and in the oil passageways. That rust will be grinding aeway at the bearings real fast. It might be a good idea to plan on dismantling the engine and cleaning out the dirt and rust. When I was learning about engines I learned that one on a IH 101 combine, it threw out the rods.

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Brian

11-26-2002 06:53:37




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 Re: B is backfiring after sitting three years, what may be the cause? in reply to aaron, 11-24-2002 17:24:46  
If it backfires like clockwork, it probably has valve problems.(bent valve or pushrod or stuck valve) The first thing I would do is replace the points and condenser and use top quality parts, not the cheap ones from farm/fleet stores. Condensers just don't seem to stand sitting out in the weather.



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Steve in N.J.

11-24-2002 20:06:46




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 Re: B is backfiring after sitting three years, what may be the cause? in reply to aaron, 11-24-2002 17:24:46  
Aaron,
I agree with Justin. Ya might have a bent pushrod there from the owner dragging the machine to get it started. I read here on the site where under those same circumstances, you can do some valvetrain damage. Steve B.



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JustinNY

11-24-2002 17:42:01




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 Re: B is backfiring after sitting three years, what may be the cause? in reply to aaron, 11-24-2002 17:24:46  
Aaron, Do you know if the owner pulled the valve cover off to make sure the valves were free BEFORE he pull started it????? ????? If a valve was stuck which is a very good possibility after that amount of time sitting when he pull started it,it is a very good chance he did some damage to the valves,Ya can pull the Mag apart and clean your points that might help.I would be concerned about the valves!!!!! Justin NY Justin NY

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