Flywheel Ring Gear

skycarp

Member
I put on a new ring gear on a ford 8n and found out it is not tight around the flywheel. Is there a way to tighten it up properly?

Thanks,

Dean
 
If it was done correctly, it would have tightened itself to the flywheel as soon as it cooled.

Unless you know what exactly you did wrong, I'd let a shop try it next time.
75 Tips
 
(quoted from post at 07:47:30 01/20/18) If it was done correctly, it would have tightened itself to the flywheel as soon as it cooled.

Unless you know what exactly you did wrong, I'd let a shop try it next time.
75 Tips

Not much help here. I'll continue to look. A shop is not an option available to me.
 
Is the flywheel back in and the tractor
reassembled?
Regardless, I would just weld it on with 4 good
tacks. If the tractor is back together do it
through the starter hole. Have someone
carefully hold the ground onto the front
pulley. Failure to do that will cause the
current to arc between the crank and main
bearings and ruin them. Use a good ni rod as
the flywheel is cast iron. The ring gear is
steel.
40 years from now if it needs a new ring gear
again this one can easily be cut off with a
slitting wheel on a grinder.
Easy peasy.
 
(quoted from post at 08:19:02 01/20/18) Is the flywheel back in and the tractor
reassembled?
Regardless, I would just weld it on with 4 good
tacks. If the tractor is back together do it
through the starter hole. Have someone
carefully hold the ground onto the front
pulley. Failure to do that will cause the
current to arc between the crank and main
bearings and ruin them. Use a good ni rod as
the flywheel is cast iron. The ring gear is
steel.
40 years from now if it needs a new ring gear
again this one can easily be cut off with a
slitting wheel on a grinder.
Easy peasy.

Good stuff ultradog MN. The tractor is still split, the work is being done by a master mechanic in his dads shop. He contacted me, as I have done a few and gave him the new ring gear. I am out of town so I can't help him right now. A few beads on the flywheel with ni rod sounds like the fix. You're response is much appreciated.
 
(quoted from post at 09:01:41 01/20/18) Just so we are on the same page here - ie,
tacks vs beads.
4 good tacks about 1/2" long evenly spaced
around the flywheel is good.
yes, we are on the same page.
 
(quoted from post at 12:55:22 01/20/18)
(quoted from post at 09:01:41 01/20/18) Just so we are on the same page here - ie,
tacks vs beads.
4 good tacks about 1/2" long evenly spaced
around the flywheel is good.
yes, we are on the same page.

Hope that your master mechanic is also a good welder.
• Make sure the ring gear is well clamped all around because of heat shifting.
• Disconnect the battery.

I'd do the first of four short beads up top then rotate 180 for the second, always welding at top (horizontally) will probably be the most comfortable welding position too.
 
I can tell everyone exactly why it doesn't fit. It is because many parts 'suppliers' nowadays, you know, the Cheena made junkers, have no clue, just go ahead and try to make parts without knowing anything about it, nor having a drawing to go by. They make the ringgear ID the same size as the flywheel OD and that is why there are problems with fit and function. I made thousands, yes actually made, Ford 6375 flywheels back in my NC days. I turned them on Warner Swasey NC Lathes, then drilled them on NATCOs, tapped them on gang drills, assembled them with heated ringgears, refaced the clutch faces, then balanced, boxed and shipped to all Ford Service centers and dealers. I still have the blueprints. Ringgears cold, as machined, are .060" smaller on the ID than the flywheel ringgear OD which is +/- .002". They are tempered steel, must be heated up in order to slip fit onto the ringgear, then allowed to cool down. Each one is then gone over visually and if any area raised up off the ringgear seat, the gear was then staked down by an operator using a steel hammer and peg.

Tim Daley(MI)
 
Or decades of wear removing and installing them, or a ring gear that slipped and wore down the flywheel. Hard to jump to the conclusion of a bad part when mating it to a part 70 years old!
 

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