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IH 340 runs worse after tune up

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Sean Johnson

11-24-2003 11:41:51

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Just tuned up my International 340 and now it runs worse (rough) than it did before. I replaced the distributor cap, plugs, rotor, and points. I then substituted the original parts one by one (except the plugs) and there was no improvement. (thought maybe one of the new parts were defective) I used a plug tester to check each of the 4 plugs and the light seemed to flash the way it supposed to. The plug wires are in decent shape but I substituted a temp wire one by one.

I feel pretty silly spending $70 and have it run worse. Any help would be most appreciated.

Thanks,

Sean Johnson

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11-25-2003 04:10:59

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Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-24-2003 11:41:51

Did you check and adjust the timing?
Sounds like a timing issue.

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Sean Johnson

11-25-2003 05:30:33

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Re: Re: IH 340 runs worse after tune up in reply to HB, 11-25-2003 04:10:59

HB,

I was wondering about that myself but I thought a tune up wouldn't affect the timing. I don't have a timing light so I'd have to go another route. If anyone has found it necessary to change the timing after a tune up, it would certainly help the cause here!

Thanks,

Sean

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Allan

11-25-2003 06:53:14

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Re: Re: Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-25-2003 05:30:33

Sean,

I've been screamin' this for two days on other threads and got so much flack about it that I was really hesitant to say anything about it in your case.

The point setting affects timing, like it or not.

**IF the last guy who tuned that tractor did not have his points set correctly and then adjusted the engine's timing by EAR to make the tractor run right, then the tractor "could" be WAYYYYY YY out of time after you did your tuning.

So, you put in a new set of points and adjust them correctly. Now, all of a sudden, the dwell and the engine's base timing do not match in any way, shape or form because this last guy has "wiggled" the timing to a wrong setting just to make it run "somewhat okay" with his incorrect point setting.

See my point?

Allan

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Allan

11-25-2003 07:05:07

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Re: Re: Re: Re: IH 340 runs worse after tune up in reply to Allan, 11-25-2003 06:53:14

Sean,

Again, I'm not saying that this is your problem. I'm just suggesting that this "could" be some of the difficulity.

The rule of thumb is: Never adjust the points without afterwards rechecking the timing because the points affect the timing at a rate of 1 to 3. Then, adjust the carb as the last step.

Okay, I'll shut up now,

Allan

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11-24-2003 19:12:15

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Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-24-2003 11:41:51

I hope you used Autolite or AC spark plugs. We had a 300U in the late 1950s and it did not like the brand that started with CH. It would miss and sputter and foul the plugs. Just my 2 cents worth. I don't want to discredit the CH spark plug company as they were excellent for many applications but were just not compatable with the 300U engine.

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Sean Johnson

11-24-2003 21:03:34

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Re: Re: IH 340 runs worse after tune up in reply to JB, 11-24-2003 19:12:15

I used Champion; a direct replacement of what was in there. I'll try putting the old ones back in and see what happens.

thanks for the input.

Sean

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Ben in KY

11-24-2003 13:33:07

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Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-24-2003 11:41:51

Are you sure that the dist to plug wiring is all in proper order ? Been there done that, was embarassing.

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Sean Johnson

11-24-2003 14:06:33

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Re: Re: IH 340 runs worse after tune up in reply to Ben in KY, 11-24-2003 13:33:07

Ben,

I do one plug at a time to avoid the confusion. Also, I have the manual and double-checked the hook up; that would have been too easy!

I haven't put the original spark plugs back in yet. Doubt that's it though because I took an old one with me when I bought the new ones and the store matched it up.

I didn't mention in my original post that I also replaced the condensor. (also put the original back in, just in case)

Thanks for your help; so far this forum is pretty good!

Sean

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Gramps544

11-24-2003 12:04:16

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Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-24-2003 11:41:51

Well, you eliminated the possiblity of a cylinder not firing. I am assuming you set the dwell correctly on the points. The fact that it runs worse now with all the old parts is odd. I would check the dwell, top of the dist. cap (for a crack), the gap on your new plug. If that all appears to be ok, try putting in the old plugs.

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Gramps544

11-24-2003 12:02:29

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Re: IH 340 runs worse after tune up in reply to Sean Johnson, 11-24-2003 11:41:51

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Sean Johnson

11-24-2003 12:25:48

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Re: Re: IH 340 runs worse after tune up in reply to Gramps544, 11-24-2003 12:02:29

Thanks for the feedback Gramps. I just pulled the new plugs and checked the gaps and everything was ok. I checked the dwell twice; .020 like it's supposed to be. Since the barn has no windows, I ran the tractor at a high idle and checked the plug wires and unfortunately, there was no light show.

Guess I'll try the old plugs; got nothing to lose.

Thanks again,

Sean

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