[AT] spark plug thread repair and ford 3000 fuel pump pressure

[John Dunlap]

Repairing Corvairs.....a man after my own heart...I used to race 'em

On Thu, Apr 22, 2010 at 9:46 AM, Ken Knierim <ken.knierim at gmail.com> wrote:
> On Wed, Apr 21, 2010 at 9:03 PM, Don Bowen <don.bowen at earthlink.net> wrote:
>
>> I am about to head back to the Ozarks in a couple of months.  There are
>> a couple of projects waiting me.
>>
>> One is my '65 Ford 3000.  The last time I ran the tractor it needed
>> almost full choke to get any power.  I checked for fuel flow and cleaned
>> two of its three filters.  I suspect either the tank filter is plugged
>> or the fuel pump is bad.  I would like to take an electric fuel pump
>> with me for testing so does anyone have a recommendation on the pump
>> pressure?
>>
>> Second project is a friends chainsaw with a stripped spark plug thread.
>> He could not tell me the name of the saw or the plug size.  What are the
>> typical small engine spark plug thread sizes and depths?  I do have some
>> from my days of repairing Corvairs but being in remote areas of the
>> Ozarks it would seem that a selection of common sizes would be good to
>> have on hand.
>>
>>
> The chain saw spark plug will probably have a  standard 14 mm thread pitch.
> You can get a thread restoring device from NAPA and others for under $15
> that might do the trick (if it's long enough since many small engines have a
> rather long threaded section). If you need to cut a new set of threads the
> 14 mm uses a 1.25 mm pitch. I got one recently from McMaster-Carr (
> www.mcmaster.com) and I'm sure there are lots of others that have them. The
> 14 mm size is pretty standard though there are some smaller ones out there.
> If you've got one of those, you'll probably have to get the plug and measure
> it.
>
> Not sure on the fuel pump. My neighbor got a forklift that didn't run and
> found out that the fuel pump was part of the problem. It had a 6 PSI pump on
> it and was pushing the fuel past the float, making it run too rich. He got a
> 2 PSI pump to replace it but could have used a $10 adjustable regulator with
> the higher pressure one if he'd found that first.
> Either way you'll probably want to make sure the pressure is just enough to
> get fuel into the carb but not much more; taking the line off and running it
> into a bucket should give you an idea of fuel flow.
> Isn't the 3000 a gravity feed fuel system? On my Case tractors I found that
> I could have the fuel lines all cleaned out but if I didn't have much for
> fuel in the tank I could have trouble keeping fuel flowing (I don't run them
> often so I keep the tanks low). Turns out the fuel line had a slight uphill
> turn in it and a touch of air would cause the fuel to stop flowing. I think
> it was breaking the siphon action; the carb was lower than the bottom of the
> fuel tank but the fuel line routed slightly up for a distance before the
> carb. Adding another couple inches of fuel to the tank solved that problem.
>
> Hope this helps.
>
> Ken in AZ
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