The value of a mag re-build

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
JimCT
10+ Years
10+ Years
Posts: 35
Joined: Tue Dec 27, 2005 8:52 pm
Location: Haddam, CT

The value of a mag re-build

Postby JimCT » Mon Dec 29, 2014 6:47 pm

Have been having troubles with the cub engine for a couple of years. Would run fine then cut out for a second or two then pick up and run fine for an hour or so then cut out again, get going again and so on. Since it cut out abruptly then resumed with no black smoke or leaning symptoms I figured it had to be spark. To cut to the chase, after changing out the points, condenser, mag coil, mag cap, dist. cap, wires, & plugs with no affect on the problem, I took the mag off and drove it over to Mark's Magneto in East Hampton CT. Being the pro he is, he spotted the problem in 2 seconds. The mag shaft bushings were worn and were allowing the lobed shaft which the points follower rides on to wiggle out of true about .020". That wiggle was enough to cause the points gap to wander way off the spec. setting for the make & break.

Two days later Mark had the mag back together and ready for pick up. When I got there he had it set up on a test stand which spun the mag over at engine speed. What a spark! Blue lightning which jumped over 1/2". She'd never done that before in my memory. We've had the old girl ('49) since 1953 and this was the first mag re-build. Considering she's a working girl with who knows how many hours on her, it says a lot about the longevity built into her.

So I guess what I'm trying to say is that something to consider if you have "iffy" problems with ignition, is a mag rebuild. Also, it brings to mind the quality that was built into US made tractors at one time. That mag did it's job for 64 years without a hiccup. Both Mark & I will be long gone before another re-build is needed. Hope there will still be mag. wizards around.

edit>>> Just remembered.... Mark said always use copper wire spark plug wires with a mag. Regular carbon wires have too much resistance.
'49 Cub, Ford 621, Ford 2000 diesel, CJ5 diesel

CapeCodCubs
5+ Years
5+ Years
Posts: 2790
Joined: Fri Jan 11, 2008 5:30 pm
Zip Code: 02747
Tractors Owned: .
1948 F Cub Fast hitch
1949 F Cub
1950 F Cub Fast hitch
1965 Loboy Fast hitch

(15) FastHitch implements
tons' of cultivating and planting stuff
C-16 Cub Middlebuster
A33 Cub bean harvested
NOS Planet Jr. planter
172 planter, large combo hopper, 101A fertilzer hopper
Location: MA, Dartmouth

Re: The value of a mag re-build

Postby CapeCodCubs » Mon Dec 29, 2014 9:48 pm

Jim
Thanks for sharing! Mark Magneto's sounds like a good resource for the New England area Cub owners. :D
Image

User avatar
Stanton
Team Cub Mentor
Team Cub Mentor
Posts: 4274
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1945 Farmall H, serial #213,651
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: The value of a mag re-build

Postby Stanton » Tue Dec 30, 2014 7:41 am

Thanks for sharing your experience. That's valuable information for all us who still have working mags on our tractors. :coffee:
Stanton
Image Circle of Safety

ScottyD'sdad
Cub Pro
Cub Pro
Posts: 6513
Joined: Thu Aug 31, 2006 7:00 pm
Zip Code: 02769
Tractors Owned: 6"F" cubs
5 lo-boys
1 154
1 184
1 IH444
1 Oliver OC3 crawler
1 AC D10
1 IH 100 manure spreader
1 IH model B corn grinder
3 power units
cub demonstrator
Circle of Safety: Y
Location: Ma. Rehoboth

Re: The value of a mag re-build

Postby ScottyD'sdad » Tue Dec 30, 2014 7:51 am

CapeCodCubs wrote:Jim
Thanks for sharing! Mark Magneto's sounds like a good resource for the New England area Cub owners. :D

Mark is a great fixer, for all kinds of mags, and has mag parts, for most any brand of mag.
Ed
Image
Member of Chapter 18, and National
Circle of Safety


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: BIGHOSS, Command52, HarveyCub and 5 guests