[AT] F-12

[John Hall]

 Irma, call Rice Equipment or The Fordson House to get a fuel pump rebuild 
kit. I think the Fordson House has been advertising them in magazines lately 
for less than $40.

F-4's are one of my favorite mags to work on ( I keep everything on hand to 
re-build one except for bearings). We have 3  tractors here that use it as 
well as having several friends with them.  As far as rebuilding the mag 
yourself, figure on a coil, points, condenser, and the 5 brushes for the 
cap. With shipping it may cost as much as $100, depending on where you buy 
the parts. The scary part is the guy you bought this tractor from took the 
mag apart and never got the tractor to run. A lot of people tear into mags 
thinking they know what they are doing only to bail out or re-assemble it 
without it working properly. I had to back out on the KW mag on my Titan for 
lack of a decent mag to start with and lack of experience on that model. The 
F-4's however are pretty simple and parts are easy to get.

 Never assume that firing a spark plug is an adequate test of performance. 
One rule of thumb on any high tension mag is that it MUST jump a 1/4" spark 
or it will not work to your satisfaction. some newer magnetos will jump a 
7/16" spark. These are not measurements you estimate either. We have an 
Allen magneto/generator tester that allows us to see how hot a mag is and at 
what speed so we can see if there are problems with the impulse, cap etc. If 
you can buy a GOOD mag for a $100 bucks, someone is doing you a favor or 
doesn't know what they have. I would check how hot your spark is and then 
check timing to the engine--there are marks on the flywheel--consult your 
service manual.  Who knows, a very light polishing on the points may get you 
going! Also read and understand about retarding the spark before attempting 
to crank by hand!

 If you need a mag, I have dealt with Mark's Magneto Service, buying parts 
and tools as well as getting technical advice. I have always been impressed. 
I would up with a mag for my Titan that he rebuilt and must say it works 
flawlessly. I believe he offers trade-in allowances and his rebuilt mags 
probably come with a warranty.

John Hall

----- Original Message ----- 
From: <bellville1 at gmail.com>
To: <at at lists.antique-tractor.com>
Sent: Saturday, July 26, 2008 11:17 PM
Subject: [AT] F-12


> John  This is an F-4 mag, we traded for this F12 after just hearing it pop 
> a
> Few times. The fella we got it from had the mag off and apart, dont know 
> why
> He did that ?
> So It has been sitting in the shed since then about a year or more and now
> We want to run - start it at least.
> Our service manual has a page on the mag - ign systems, what leans heavily
> Toward the W40 J6 mag`s used on 6cyl engines. Oh yes it gives the basic 
> info
> On timing , removal, points setting`s and all.
> All it says is to refer to magneto section of Standard Units for overhaul
> Data for F4 mags. I need the info to overhaul and or take apart and
> Reassamble properly.
> I can get a nice one for 100 bucks + shipping, but belive that this one is
> Fixable. It may be out of time and have that info here in front of me. 
> Where
> Is the best place to buy order a fuel pump repair kit for this tractor  ?
> The leaking fuel is another reason we have put off attempting to run this
> Tractor
>
>  
> Irma
> Western, KY