[AT] Spark Plug Fouling Ferguson TO20

[John Maddock]

I have a similar problem with a Toyota 5R engine in a Daihatsu truck. 
Various tests have convinced me the valve stem seals have gone hard from
time and and (possibly) lack of use.

Oil seal rejuvenation treatment improved hte situation, but #4 still
fouls.  I simply swap it with #1 whenever necesary, where it gets cleaned
up.

For what its worth...

JV

> Request advice or suggestions on what I can do to reduce fouling on #4
> spark plug on my 1951 Ferguson TO-20, here or to me direct.
> I've had it since 1990, only use it 8 or 10 hours a year.  Field mowing,
> snow removal, wood splitting (auger).
> Using 10W30 oil, Champion D21 plugs, which I understand is a hot plug for
> this application.
> At first, I could go twenty or 25 hours between plug fouling/cleaning. 
> Only #4 is a problem, others are fine. Using very little oil.
>
> Now I need to clean #4 every six or seven hours.
> Appreciate your suggestions on how I can reduce this issue.  I know
> someday the engine should be worked on, but with this limited annual use I
> can't justify tearing it down.
> Heavier oil?Different plugs?  If so, on all cylinders, or just #4?Oil
> additives?Other thoughts?
> Thanks in advance
> Steve Zakalukszakaluk at aol.comFalcon, CO
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