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Ford NAA Spark Plug Problem

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04-08-1999 12:36:37

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A friend has the above tractor and has had a reoccuring problem of the same plug not sparking. His #4 plug stops firing and when replaced with a new plug, the motor runs fine. Compression check is good, wires are ok and so is cap. Any Ideas?

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RK Smith

04-21-1999 18:20:00

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 Re: Ford NAA Spark Plug Problem in reply to Chip, 04-08-1999 12:36:37  
you can't be positive the plug wire is ok. Visual check is not enough. Exchange that plug wire for another temporarily, and see if it transfers the problem, - if so - bingo! and replace the wire. In fact, replace the whole set. If no transfer, replace the plug. If it fails immediately, suspect the rotor or dist cap (only superman can see an open break inside the cap) . If it fails after several hours, suspect oil fouling. It can have good compression and still leak around the valve guides.

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Tim S

04-13-1999 19:10:55

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 Re: Ford NAA Spark Plug Problem in reply to Chip, 04-08-1999 12:36:37  
I have a 600 that did the same thing, it would foul 2 plugs. I finally pulled the distubtor out and checked it, i found worn bushings. Changed dist. with another 600 and it runs fine. So check the dist. shaft for looseness. good luck. Tim S.

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