Tractor emits flames from exhaust during startup?

Will Herring · Jul 9, 2018

Got a phone call from a relative with an Allis Chalmers WD-45 and they said that when they start the tractor up, it shoots flames out of the exhaust.

Going to try and get over and look at it this week, but was just curious if anybody had any thoughts or ideas of what I should be looking at or for?

old · Jul 9, 2018

Good chance they choke it a bit to much at start up so some raw gas ends up in the exhaust manifold so when it starts that gas burns. Or if it does it all the time one plug is fouled and so the gas from that cylinder gets in the manifold and then is burned

David G · Jul 9, 2018

I agree with Old, has to be excess fuel in the manifold, if it does not crank smooth, I would suspect a bad exhaust valve also.

T.R.K. · Jul 9, 2018

How is the manifold? The intake passages and the exhaust passages are cast together on those engines, aren't they?. Could there be a porous
spot where fuel is getting in the exhaust side when choked or flooded?

How does it run after its started? Does it idle o.k.?

It could also be a bad exhaust valve seat, which would allow combustion fire into the exhaust manifold.

(I think I heard a story like this once-like 40 years ago- and it involved an AC but cannot confirm it, my Cousin the old time mechanic
died.)

Texasmark1 · Jul 10, 2018

+1 on excess fuel in the exhaust circuit somewhere. I'd think it's a crack (rust scale flaked of and left a hole) of some kind which emits enough to make
a puddle overnight (sort of thing) but not enough to interfere with normal operation.

jacksun65 · Jul 10, 2018

I remember as a kid, Neighbor had a WD-45 tuned up that if you used it at night would shoot a flame out
the strait pipe about six inches.

rustyfarmall · Jul 10, 2018

(quoted from post at 07:16:57 07/10/18) I remember as a kid, Neighbor had a WD-45 tuned up that if you used it at night would shoot a flame out
the strait pipe about six inches.

I've seen the same thing from a Farmall M, and also a John Deere 4010 gasser. Pretty much ANY tractor will emit a flame from the exhaust when being worked, but you see it only at night.

Will Herring · Jul 11, 2018

Interesting. Thanks for the ideas, guys! I hope to make it out there today or tomorrow to take a look at it, and maybe take a video of it starting to see just how bad it is. Will report back with my findings.

Tractor emits flames from exhaust during startup?

Will Herring

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old

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David G

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T.R.K.

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Texasmark1

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jacksun65

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rustyfarmall

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Will Herring

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