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Fouled Plugs? Hard Starting in John Deerer LA

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AWB

08-12-2007 12:08:54

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My LA will not start unless I take out the spark plugs and wirebrush them clean before each startup. They get some carbon on them but the electrodes are not bridged with carbon. The carburator seems to have the air/fuel mixture adjusted correctly. Clean the sparkplugs and it starts and runs perfectly until you go to restart it. Then it won't start until the plugs are re- cleaned. The engine has about 12 hours run time on it since being remanufactured. The oil pressure is a little higher than it would have to be....could this be contributing to the plug fouling problem? Any help would be greatly appreciated. Thanks.

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Dwayne

08-12-2007 14:18:18

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Re: Fouled Plugs? Hard Starting in John Deerer LA in reply to AWB, 08-12-2007 12:08:54

If you are using a champion plug, throw them away and get Autolite C45L plugs. they are the heat range that you need. the black carbon on the plugs also sounds like it is too rich. What is the carb you have. It should be a Marvel Schebler TSX 85. if it is not, you need to get the correct one. if it is, you most likly have a problem with the high speed jet. they are not adjustable. We have seen dozens of them drilled out for what ever reason.

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Duane Larson

08-12-2007 14:50:59

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Re: Fouled Plugs? Hard Starting in John Deerer LA in reply to Dwayne, 08-12-2007 14:18:18

I think C45L is an ACDelco number, not Autolite. It is my understanding from a Delphi employee that AC went out of the plug business about a year ago when Delphi went down - not sure who is making plugs that go in ACDelco boxes now, but one rumor was NGK was making them. The question is what specs are the C45L plugs now made to - the old AC specs or some spec of the present manufacturer. That is why I didn't list them as a good plug for the LA.

I'll try to learn more at Portland during the Spark Plug Collectors of America gathering.

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Dwayne

08-12-2007 15:23:34

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Re: Fouled Plugs? Hard Starting in John Deerer LA in reply to Duane Larson, 08-12-2007 14:50:59

you are correct, I was thinking of the 3077 for the herc l's is an autolite. I havn't heard about who makes the ac plugs now. I know I have used a few dozen this year and havn't had any problems.

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Duane Larson

08-12-2007 13:13:58

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Re: Fouled Plugs? Hard Starting in John Deerer LA in reply to AWB, 08-12-2007 12:08:54

AWB,
Wire brushing the center insulator is not a good idea, as the insulator can become a conductor if any amount of the wire brush is transferred to it. If you are using a plug with a glazed center insulator, bead blasting is not a good idea either as it removes the glaze. Generally the problem is related to the center insulator becoming a conductor for some reason, and the spark has the least path of resistance at some point other than the gap at the end of the plug.

If you have a dry, black buildup it likely indicates a mixture on the rich side - if the buildup is oily it indicates oil is getting into the combustion chamber either thru the valve guides or by the rings.

What to do - try a 14mm non-resistor plug with a 7/16" reach and the highest heat range you can find, for example Champion H12, Autolite 218, or your favorite equivalent to one of these. When cleaning plugs, get a can of good carburetor cleaner and spray the insulator to clean it up. If you have a good magneto you might open the gap up a bit to increase the heat generated at the gap and possibly burn off some of the soot. You don't have a shutter on your LA, so you can't use that to raise the engine heat but you could put a piece of cardboard over the front to make it run hotter - watching the heat gauge of course.

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