back firing upon start up.

Scotmick · Aug 1, 2011

I have a 1960 IH 240U, with a front loader.

Recently, it started to backfire upon startup. Very loud and sometimes it starts and others I have to leave it and come back to try again, still back firing but it will start and then it runs rough. Very rich?

I smell gasoline, but no leaks to speak of.

Any suggestions?

Thanks,

Don

rustyfarmall · Aug 1, 2011

(quoted from post at 06:54:48 08/01/11) I have a 1960 IH 240U, with a front loader.

Recently, it started to backfire upon startup. Very loud and sometimes it starts and others I have to leave it and come back to try again, still back firing but it will start and then it runs rough. Very rich?

I smell gasoline, but no leaks to speak of.

Any suggestions?

Thanks,

Don

How long since you did a good, general tune up?

I'm thinkin' there are some carburetor issues also.

El Toro · Aug 1, 2011

I would rebuild that carburetor and check that float to make there's no gas in it when you shake it. Do that tuneup as Rusty suggested. Hal

rustred · Aug 1, 2011

dont forget to adjust the valves, as this is one of the most overlooked things in a tune up.
intake and exhaust .014 hot.
a carburator does not cause a backfire.

Scotmick · Aug 1, 2011

Thanks, Guys, for the suggestions. I blew out the gasoline in-line filter, got some particles out and checked the air cleaner oil cup, that was clean as a whistle.

I started it up, no backfire, drove it for awhile and parked it. An hour later it wouldn't start, but no more back firing for now. The battery went dead and I am re-charging it and will be back tomorrow as a storm is approaching.

Thanks again.

old · Aug 1, 2011

In line gas filter??????? Those most of the time cause more problem then they are worth. I throw them away on all tractors since the sediment bowl if it has the correct parts in it work better then the in line filters ever will. Plus in line filters most of them that is are made for systems with fuel pumps and most tractors do not have fuel pumps and the 240 I know does not. And yes running lean can cause one to back fire as can valve set to tight and over times valve do in fact slowly get tighter from wear

Gerry....WI · Aug 1, 2011

As Old said get rid of the in-line filter.

If the gas tank is dirty address that.

rustyfarmall · Aug 1, 2011

(quoted from post at 09:08:20 08/01/11) Thanks, Guys, for the suggestions. I blew out the gasoline in-line filter, got some particles out and checked the air cleaner oil cup, that was clean as a whistle.

I started it up, no backfire, drove it for awhile and parked it. An hour later it wouldn't start, but no more back firing for now. The battery went dead and I am re-charging it and will be back tomorrow as a storm is approaching.

Thanks again.

Air cleaner oil cup clean as a whistle. You do realize that the dirt accumulates in the bottom of the cup? You won't know it is dirty unless you either stick your finger down into it, or dump it out and have a look.

JRSutton · Aug 1, 2011

If it backfires out the carb, that's generally due to too much advance in your timing.

If it back fires out the exhaust(or both exhaust and carb) it's generally either too rich or too lean.

What causes the backfire in that case is that the gas/air doesn't fully burn in a cylinder, gets exhausted out and then burns while in the exhaust manifold.

Smelling gas probably means it's too rich, but not a guarantee. Since you're dealing with innefficient burning, it could be too lean and you're smelling what didn't burn because of that.

A better indication is black smoke, is there any?

Follow other's advice on adjusting the carb, but first make sure your choke is opening properly.

DanR · Aug 2, 2011

Check the valves. A stuck valve will cause a backfire.

Scotmick · Aug 2, 2011

Next day, back again; newly charged battery, tried to start and just get a clicking noise coming from the Solenoid Switch. Also the switch felt hot so I loosened all the connections and used WD-40 on them to get a better connection, tightened them up and same thing. Looks to me like the next step would be to change the Solenoid Switch. Just guessing here, I'm new to the tractor world.

Scotmick · Aug 4, 2011

Thursday AM, I removed the starter and brought it to a local rebuild shop. They just called and said that it is ready. I'll pick it up tomorrow, re-install it and see what happens. By the way, this tractor does not have a carburetor sediment bowl; the inline filter is all there is. Thanks again for all of your inputs.

back firing upon start up.

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