Re: Farmall 656 motor issues

Posted by Janicholson on March 04, 2011 at 20:11:55 from (67.72.98.45):

In Reply to: Re: Farmall 656 motor issues posted by andy stockmaster on March 04, 2011 at 17:19:08:

We can help best if we know what capability you have for diagnostics and repair. Your lead statement in this response is very helpful.
If you have a cylinder miss firing, and the tractor backfires and is not smooth, there are 50 things that could be direct cause.
Starting with which cylinder is not firing, or not firing all the time is a good starting point. Pulling off plug wires is hard on the components unless done safely.
With a used sparkplug (even from a lawn mower)the test can be done. With it not running, pull the #1 plug wire off of its plug (closest to radiator). Be careful to twist on it to break the seal of the rubber insulator before just pulling. Use the spare plug to control the pulled off plug wire. Insert the plug into the wire and place the body of the plug against the metal of the tractor engine, or use a jumper from the plug threads to the engine metal. This provides a path for high voltage, as much as 20,000 volts. Do not hold the plug, tape it to the tractor engine if needed.
Now start the tractor and note if it sounds different. it will now be missing on two cylinders and be much worse. If it is worse, do the same thing to each cylinder, putting the wires back on the tested cylinder before removing the next wire. One of the cylinders will cause no major change in the running. This cylinder is the suspect cylinder. Now check the plug wires for correct connection. The #1 plug wire is a starting point. The distributor (where the plug wires go to be fed electricity) turns Clockwise. The firing order is 153624. Thus clockwise from the #1 plug wire hole in the cap is #5 plug wire. proceed around as in the order above. If they are correct, that is good. If they are wrong Recheck your self before making changes.
If changes make it worse put it back the way it was.
The reason we all zoned in on the manifold is that a loose manifold will make every symptom you listed. And a leaky exhaust will indicate that the manifold may be leaking on the vacuum (intake) side as well. It is a common issue.
Do these tests, then start a new posting with the results. We can do this. Jim

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