how t find top dead center?

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Barebones
10+ Years
10+ Years
Posts: 57
Joined: Sun Jun 21, 2009 8:28 pm
Zip Code: 48867
Tractors Owned: 1948 Cub, 1948 Ford 8N,
1954 Ford NAA, 1956 Allis Chalmers IB
Location: Owosso, Michigan

how t find top dead center?

Postby Barebones » Wed Aug 07, 2019 10:55 am

Prepping my '48 Cub, Barebones, for the Mid-Michigan Old Gas Tractor Association show next week (featuring Internationals this year) and was temporarily stumped with wires and firing order as part of a tune up.

My tractor has a magneto and the rotor it uses has plastic gears that seem to be able to be positioned anywhere on the shaft, as opposed to the type that fits only one way. Well...I didn't pay attention when removing the rotor for replacement and needed some guidance. George Willer's post did the trick. Simple enough I could follow it and got the machine up and screaming once again by easily finding top dead center. Plus, another post led me to install the wires in correct order on the new American-made cap.

Many thanks for such a valuable resource.

When I reviewed the bill for parts bought down the road at Alderman's, I was somewhat surprised at the total. The killer: $40 for the rotor! Yow!

Anyway, mission accomplished.

outdoors4evr
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Posts: 2574
Joined: Tue Jul 22, 2008 12:44 pm
Zip Code: 48370
Tractors Owned: 184
Location: Oxford, MI

Re: how t find top dead center?

Postby outdoors4evr » Wed Aug 07, 2019 11:53 am

Should have driven another mile down the road (same side) and picked up a rotor at Steiner.
They aren't a site sponsor, but have some pretty decent reproduction parts. I think the Magneto Rotor is still the same price though.
https://www.steinertractor.com/J4-ROTOR-Magneto-Rotor
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade

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tmays
10+ Years
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Posts: 3073
Joined: Wed May 11, 2011 8:59 pm
Zip Code: 39154
Tractors Owned: 1948 Allis Chalmers G
1947 Cub
1952 Cub
1940 Farmall H
154 Cub LoBoy
Location: Vicksburg, MS

Re: how t find top dead center?

Postby tmays » Wed Aug 07, 2019 12:17 pm

Yep, mag rotors ain’t cheap
Thomas


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