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Discussion Starter #1
My tr5actor has been running like crap lately, and after checking everything else, I pulled the dist cap, at which time the rotor fell out in three different peices. It was barley running before this happened. I bought a new rotor and tried to crank it up and it acted as if it go tno spark. I pullede the cap again and the tip NEW rotor fell out, as it had broken off. What is making the rotors break?? Also, which way is the cap suppesed to go on. Where should the posision of the #1 plug wire port be? I'll be replacing the cap, as it looks as if the rotor has cut into the #3 contact point on the inside of the cap. Any help is apprecieated! I think this should cure my power problem. Thanks in advance!
 

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:howdy:Take a close look and follow the spark plug wires back to their correct connection on the Distro. cap. Firing order for the 8N is cylinder #'s 1-2-4-3.

I'm not sure why you are clipping button contacts off, wonder if your timing is out?:dunno:

Best to you!

:trink39:
 

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Discussion Starter #3
Thank you for the info. Ill also check the timing. How would it be able to breat the rotor though? I'm wondering if I didn't have the cap alighned and seated properly causing it to strike the cap.
 

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Discussion Starter #4
Also, my wire coming from the coil going to the dist cap is facing out to the right side rather than facing towards the rear, as it is in the picture you posted. Will this vary from tractor to tractor depending on the timing? Thanks
 

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Let me say that I'm no expert on tractors, I've read alot and I'm very good at finding info on line. There are many more of the MTF crew here with way more experience.

Thinking about it, I'm with you that the cap may have not been seated correctly and clipped the button contact off or just a poor manufacturing job. Timing shouldn't damage a rotor button, but never hurts to keep the engine timed correctly.

Here's a link on how to set timing on a side distro. :

http://www.ntractorclub.com/howtos/pdfs/Setting-Side-Mount-8N-Timing.pdf

Hope what I'm posting is of help to you!

:trink39:
 

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Discussion Starter #6
It is a big help!! Thank you for your time and posts.
 

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First off your dizzy has probably been pulled and replaced over the years and it is likely that it has not been installed back exactly in the correct position. But that is not biggy as long as the spark gets to the right place ar the right time. Now as for it breaking the rotors you need to check the dizzy bushings and make sure the dizzy shaft is not wobbling and causing the rotor to hit the cap. Something is causing the rotor to break so check the distribtor for slop. It is not a hard job to relace bushings IF you find that is the problem. Let us know what you find.
 

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Discussion Starter #8
Ok thanks. Am I looking for up and down an side to side play?
 

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Yep! you want the shaft to turn smooth without any up/down or side to side movement.
 

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Discussion Starter #10
Ok, I just. Checked the play in the distributor and there is none. I put the new rotor and cap on and tried to crank it. As I hit the starter I heard a noise and no spark. Pulled the cap off and there was the rotor in 3 pieces. This is really getting frustrating. I'm not running a dust cover on my diet and never have. I don't understand why this just started happening.
 

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DieselMower,

Have you tried leaving the dist. cap off and watching the button spin? See if there's a wobble to the button / shaft.
 

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Discussion Starter #12
Alright, well I checked for play and found none and no wobbling. So I put on another rotor and took great care to make sure the cap was PERFECTLY aligned. It started on the first try! My guess is that it was slightly off before and cliping the ends of the rotor off. Thanks for all the help! Operator error!!
 

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Alright, well I checked for play and found none and no wobbling. So I put on another rotor and took great care to make sure the cap was PERFECTLY aligned. It started on the first try! My guess is that it was slightly off before and cliping the ends of the rotor off. Thanks for all the help! Operator error!!
:thThumbsU


:trink39:
 

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Fellows;
I've been having a very similar problem and eventually discovered that the distributor rotor clip was missing.

What happened was that the timing went wonky all at once and nothing I did made a difference. A friend came over and noticed a wobble or sloppiness in the rotor, and that the groove in the distributor shaft just below the rotor was empty and concluded that there was a missing part...the rotor clip.

I didn't see any broken parts floating around in there, but now, I expect that it had run, though not perfectly, without it. When the tractor failed, after 97 hours of use, I removed the distributor cap and found the broken rotor and started repair process.

I assume that the rotor had lasted nearly 100 hours on shear luck and finally spun off center and broke. I have broken three rotors just today, before my buddy came over and spotted the missing clip. Good thing too, it was getting expensive!

I haven't installed a new clip yet, but I have ordered one online and will try to round another one up locally.

In the mean time...does it sound to you guys like I am on the right track?

Thanks,
Kweeksdraw
 

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I know this is an old thread but I think I do need bushings. I haven't broken any rotors but there is play and there's a groov inside the cap from the rotor hitting it. I'm pretty confident that I can replace them, just looking for an exploded drawing of the distributor before I dig in.
 

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