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Firing Order 1948 B Allis Chalmers

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gdtractor
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PostPosted: Mon Mar 20, 2017 9:51 am    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

Are the fire & center line close together?
(I know I could look , but thought I would ask the expert first). Ha
Gary
 
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Dick L
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Location: Edon Ohio

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PostPosted: Mon Mar 20, 2017 12:18 pm    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

Fire line is 30? before Center or TDC.
 
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Dick L
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PostPosted: Mon Mar 20, 2017 12:44 pm    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

I just looked at your video! I have had some that were not marked also. I have not repaired a magneto in ten or so years. I have always had several magnetos in parts and would hold the rotor in the position that it was on a marked gear. I have several in a box out in the shed that If I can get back in there with my walker I'll see if I can tell you an easy way to mesh the gears correctly. The metal gear had one tapered tooth on the face. I an not sure at this point if it is up or down the way you were holding the magneto in your video. I am thinking up but not sure. Maybe Steve from B&B will check in and help with that.
 
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gdtractor
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PostPosted: Mon Mar 20, 2017 1:04 pm    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

Thanks SOOOOOO much .. that had me really stumped!!
Took my mag in to a repair person .. to make sure it was fixed right ..
then I will put it on with the TDC position and tweek it from there ..
a friend didn't think it had much "snap" to it . so I thought I should get it looked at .

thanks AGAIN ..

Gary
 
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Dick L
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PostPosted: Mon Mar 20, 2017 2:21 pm    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

If you put the flywheel on CENTER before you try to bolt your magneto to the block you will not get the drive to line up because of the impulse spring. You first set it to the FIRE line or even back the engine up a little so when the magneto drive lugs line up you do not have tension on the impulse spring. Then after you have the magneto bolted fast you find the Center line in the inspection hole when you spark on number one cylinder at the compression stroke. If you do not see the Center line you rotate the magneto a little until you have the Center line in the center of the inspection hole. If do it this way when running with a timing light you would see the FIRE line in the center of the inspection hole. Your magneto has a 30? mechanical advance. When cold timed at TDC the advance places the FIRE line in the center of the inspection hole when running at high idle. I always take these steps when installing a magneto to prove to my eyes I have it timed to run. Many will say it is not necessary to take this step. Just time it by ear after it starts. I learned thru my many mistakes that I personally can not assume anything. The extra time for me to prove things out saves me time in the long run.
 
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gdtractor
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PostPosted: Mon Mar 20, 2017 6:08 pm    Post subject: Re: Firing Order 1948 B Allis Chalmers Reply to specific post Reply with quote

Got it ..
Thank you again !!!!!
 
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