HI !
i have repared a ponymotor to my D7 17a 18119. i have change the crankshaft and the camshaft, but now the magnet not match the new camshaft which needs a 180 degrees magnet, the magnet i have are a 90 degrees, so i'm looking for a 180 degrees woco magnet. I hope anyone can give me an idea where i can find one. I'm living here in Sweden.


Hoping for answer and thank you.

Sweman

Here is some info that should be useful but I could use some help on verification.
The D7 17A changed from the vertical mount (American Bosch) magneto to the lower front mount Wico magneto at serial number 17A11668-up. I show two magneto arrangements to match the even fire and odd fire pony motors.
The even fire would use an AB 360 degree #D410 which would be a Cat number 4S6470 which translates to a Wico #XH-2839.
The odd fire would be an AB 180 degree #D311 which would be a Cat number 4S6468 which translates to a Wico #XH2837S or a XH-1906.
I am missing the parts manual that covers the 18119 serial number so I'm not able to check for sure.
SJ if you read this does it sound right to you??? or can anyone provide input.

I'm not sure, but I think you need to look at that magneto match again real careful like. My D7 is a 3T but I think the timing is the same.

Cat used a 180 degree crankshaft. That translates to 90 degrees of camshaft rotation, therefore you need a 90 degree magneto if runs at camshaft speed or a 180 if it runs at crankshaft speed. On the 3T the magneto runs at crankshaft speed but the rotor in the mag is driven at cam speed.

Just be real sure what you are dealing with there before you spend a bunch of money. I've been called out several times when the only problem was in the timing.

let us know how it goes.

Hi Jack,
No doubt the 3T is a 180 degree crank but later ponies also utilized a 360 degree crank (both throws had same indexing with a heavy bolt on counterweight) referred to as the even fire vs odd fire unit.

I'll be darned. I've never seen or heard of a 360 degree pony crank! Of course, I only tangled with a few of them that I and friends happen to have. There's been so much misunderstanding of the timing on the 180 crank engines I figured it best to be first sure of just what we have in hand.

I have a d7 magneto counterclock wise 7h6866

OM I don,t have parts book to check the mag numbers that were used but the 17A earlier ones and the D8s and D9s used the crank that did have the throws on the same side and then when they went to the odd firing on them the throws were 180 D. apart and that,s when they put the mag down front and not on top like earlier D7,8, & 9s in the 17A 14A & 15A and the D9s of that era along with other starting engines that were the same on some other engines.

hello ,this page may help you out with the info you need ,bruce oz

www.oldengine.org/members/diesel/MagnetoMisc/MagApps7.htm



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The 7H6866 is a Wico magneto that was used on the early 360 degree crank but it was for the crank driven vertical drive. Not sure if it will work "as is" on this conversion application.

Hi Bruce,
Thanks for the chart...I've used it before but like many charts it is not model specific nor do they show the evolution of change.
Trying to decipher the various style pony motors and the assortment of American Bosch, Wico, Eiseman, Prestolite, & Fairbanks along with Cat numbers and each companies own numbering system is a real challenge. Gets even worse when units of the same brand are superseded:rolleyes: .