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<p>That tractor is recommended to use 30w in summer and 20W in
winter. multi-grade oils don't work as well in the older engines
as they do not get hot enough for the viscosity modifiers to
work. Your sig line states Falcon, CO, definitely cooler than
OK, so I would check to make sure my thermostat was working to
keep the engine hot enough. It is possible that you carburetor is
running a little rich. Worst case is the oil ring is bad on that
cylinder. At your altitude, I would use at least 89 octane
gasoline. In the old days there was a high compression, high
altitude piston for that tractor at that altitude. Tractor supply
used to offer a high altitude piston and sleeve set. The sleeve
set available for that tractor is the overbore set with 3.375
pistons the original was the 3.125 pistons. The high altitude
pistons were domed... I do not find a listing for hte high
altitude pistons. That tractor is not exceptionally difficult to
rebuild, nor is it a time consuming job to rebuild. The last one
I overhauled took 3 days to do, and that included cleaning and the
head work. The parts for a running engine should not cost over
$550. If you pay attention to the bearing wear, etc. you might be
able to reuse a lot of parts, if you mark and save them. <br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 6/23/2019 5:29 PM, Szakaluk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:255144003.833713.1561328971680@mail.yahoo.com">
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<div
style="font-size:12pt;font-family:arial,helvetica,sans-serif;color:black;">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.
<div><br>
</div>
<div>I've had it since 1990, only use it 8 or 10 hours a year.
Field mowing, snow removal, wood splitting (auger).</div>
<div><br>
</div>
<div>Using 10W30 oil, Champion D21 plugs, which I understand is
a hot plug for this application.</div>
<div><br>
</div>
<div>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.<br>
</div>
<div><br>
</div>
<div>Now I need to clean #4 every six or seven hours.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Heavier oil?</div>
<div>Different plugs? If so, on all cylinders, or just #4?</div>
<div>Oil additives?</div>
<div>Other thoughts?</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div><br>
</div>
<div>Steve Zakaluk</div>
<div><a class="moz-txt-link-abbreviated" href="mailto:szakaluk@aol.com">szakaluk@aol.com</a></div>
<div>Falcon, CO</div>
<div><br>
</div>
</div>
<br>
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