Re: Farmall 400 backfiring and dying

Posted by Hugh MacKay on March 06, 2007 at 03:17:42 from (216.208.58.175):

In Reply to: Farmall 400 backfiring and dying posted by Duanes on March 05, 2007 at 08:33:36:

Duanes: Is it possible your distributor drive gears have slipped a few teeth. Read what I said to Del Archer, now on page 3 or 4. Usually once they slip they don't last as long as yours has until they strip completely.

My 130, same distributor and drive gears stripped back two months ago. Acted very much like yours except it was over much quicker. Just as this started did you notice the tractor laboring as if timing advance was off by a few degrees.

This messes them up quite badly, usually the first sign is tractor laboring, then it starts popping and belches black smoke. Even when it get so far off on timing advance that it ocasionally backfires, it may still start and run for a bit. Finally it will backfire as you turn it over on starter and the backfire will almost deafen you, but at that point it probably wont make any attempt to fire and run.

I had this happen to my 130 tractor twice, first about 1994 and again just two months ago. First time gears were worn badly. This time I found crushed ice all through the grease in the gear box. I suspect there was a pocket of water in the grease that froze to a cube, it was about 0 degrees F. I had been plowing snow for about 1/2 hour from cold start up, and from the looks of the gears I think I started off with a block of ice in there and those gears ground it up. Also there is a bushing around the shaft on the driver gear. I didn't replace that bushing in 94, I think maybe I should have. I can see where gears have been riding each other, thus I don't believe ice was the complete factor. The gears were not worn near as bad this time as in 94, but they did have a lot of fresh damage, caused by the ice in my opinion.

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