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Case Tractors Discussion Forum

Spark issues......Need Help????

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driling

06-13-2006 05:47:37

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I was just wondering why the number two cylinder will not spark unless the wire is loose to the plug?..... ..... ..... Need Help

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driling

06-14-2006 09:58:48

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Re: Spark issues......Need Help???? in reply to driling, 06-13-2006 05:47:37

Wow..... ....thankyou..... ...I recently ordered a new exhaust manifold which ironically was bad around the number 2 cylinder.....ordering parts from the other part of this site is really effective anyway when I pulled the intake manifold the nuts weren"t tight at all and wondered if this could be introducing unwanted vacuum?..... .Will change cap ( cracked ) rotor and plug wires and will change that defective plug.

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Joe (Wa)

06-13-2006 07:34:23

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Re: Spark issues......Need Help???? in reply to driling, 06-13-2006 05:47:37

The air gap between the wire and the plug introduces a resistance that prevents the plug from firing until the collapsing field in the coil rises to a higher voltage then required to fire a normal plug.

Champion and others make a plug that has an air gap in the electrode core for engines where full hp is required but are also subjected to low hp functions or prolonged idling that causes fowling. The higher voltage spark generated tends to blow the carbon off the electrode. They are sometimes referred to as auxiliary gap, self-cleaning, or booster plugs.

So that is what is happening when the wire is gapped from the plug. Change the plug and if the new one has the same symtoms, you need to do a compression test, check for low compression and/or excessive oil leakage into the cylinder.

Joe

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Mathias NY

06-13-2006 06:49:31

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Re: Spark issues......Need Help???? in reply to driling, 06-13-2006 05:47:37

Try swapping wires and plugs with a different cylinder. If #2 fires without trouble and the other cylinder does not, the problem is with the plug or wire. Swapping just the plugs would further narrow down the problem.

Good luck.

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driling

06-14-2006 10:04:31

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Re: Spark issues......Need Help???? in reply to Mathias NY, 06-13-2006 06:49:31

I live near Machias NY would that happen to be where you are?..... .of course for the sake of privacy you needn't answer but, every time I have seen that name I have wondered?

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Mathias NY

06-14-2006 11:12:31

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Re: Spark issues......Need Help???? in reply to driling, 06-14-2006 10:04:31

Haha, nope I live about 30 minutes East of Rochester, NY.

My name is actually Mathias. It's not a very common one, but is is an old family name.

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Nedd

06-13-2006 06:04:59

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Re: Spark issues......Need Help???? in reply to driling, 06-13-2006 05:47:37

Every spark plug has some resistance in it. That is what the white part of the plug is for. (it is better porcelain than any dinner plate made.)The resistance in your number 2 plug is bad and the plug needs to be replaced. When you pull the wire loose it increases the resistance to where it needs to be to fire. Hope that helps.

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