Groove on flywheel under ring gear 2N

Good morning,
I am working on a 1944 2N and removed the ring gear due to bad teeth. The flywheel has a groove where the ring gear was as though it has spun.
I am wondering if the diameter is supposed to be smaller there or is it supposed to be the same all the way?
I do not have a way to measure it, but it looks like the groove diameter may be about .010 inch smaller.
Any one put a new ring gear on a flywheel like that and go on successfully?
Please let me know.
Thanks,
Scooter

I would just put it on and tap the junction with a welder 4 times on each side. Even if you do not have a welder, I'd bet you
know someone who would do it for you. I did one that way and I am sure it will last longer than I do.

Back in the 70's I turned many 6375 flywheels for Ford HD trucks, cut my teeth on NC Machining with them actually, on Warner & Swasey 2SC's..and we did all the rest of the machining and assembling with the 6384 ringgears as well. The ringgears were heated up in a gas oven then hand sweated on the ring gear diameter of the flywheel. After they cooled, the ringgears had to be staked down all the way to seat properly. After that, they came back to my turning department to get refaced; clutch face had to be machined after ringgear assembly to ensure the face was square to the world and runout called out at .005" max. As I recall, I still have the original Ford blueprints for the flywheels and ringgears stored somewhere over in the barn, the ringgear ID is .030" under the flywheel ringgear turned diameter. The flywheel ringgear diameter was spec'd at ? .002". Don't know why yours spun, it shouldn't unless it was manufactured wrong, or, most likely, someone went to put a new ringgear on and thought it was too small so had the flywheel ringgear diameter machined down/undersize to fit. Since the ringgears are made of tempered heat treated steel, and the flywheels are softer machined cast iron, it would be easier to machine the flywheel. It depends how boogered up the flywheel is...you can find used ones all the time. Another possibility is that the original Ford ringgears had a large .060 x 45? chamfer on the ID of ONE side and that was to face down on the ringgear seat of flywheel. Later, suppliers put the chamfer on both sides so at assembly it didn't matter which side went face down.

[i:654c4848f0][b:654c4848f0]<font size="4">Tim Daley(MI)</font>[/b:654c4848f0][/i:654c4848f0]<table width="100" border="1" cellpadding="0" cellspacing="0" bordercolor="#000000"><tr><td height="25" colspan="2" bgcolor="#CC0000"></td></tr><tr><td> </td><td></td></tr></table>

(quoted from post at 07:20:31 06/29/17) Good morning,
I am working on a 1944 2N and removed the ring gear due to bad teeth. The flywheel has a groove where the ring gear was as though it has spun.
I am wondering if the diameter is supposed to be smaller there or is it supposed to be the same all the way?
I do not have a way to measure it, but it looks like the groove diameter may be about .010 inch smaller.
Any one put a new ring gear on a flywheel like that and go on successfully?
Please let me know.
Thanks,
Scooter

Click to expand...

That is how it is supposed to be.

TOH

My 9n also has a grove for the gear to set in. I had a terrible
time getting the gear off. The new gear wouldn't shrink down
tight. An old Ford dealer up by Lincoln NE told me to squirt cold
water on the gear while hot. This did make it fit tighter. I also
spot welded it in six places.

This was back in 2006 and I've not had any problems.

Just be SURE the welder doesn't run his Ground Connection through the Engine Bearings...

Good evening,
Thank you everyone for the replies. I did look at the flywheel some more and now knowing that it was originally machined that way it makes sense because the groove is not galled and the chamfer on the ring gear would have left a shape there.
I found a 12" mic and 12" calipers at work and will take measurements prior to installing the new ring gear. If I think it needs to be welded I will do it with a mig while it is out of the tractor.
Thank you.
Scooter

There is a slight undercut on the flywheel at the ringgear seat, but I wouldn't label it a groove...

(quoted from post at 06:33:17 06/30/17) There is a slight undercut on the flywheel at the ring gear seat, but I wouldn't label it a groove...

Click to expand...

AutoCad would ;-)

TOH

I have the original drawing and it is dimensioned as an undercut....

TPD

Good evening,
I have received my parts and inspected the new ring gear to find the chamfer on the inside diameter is on the wrong side. It should be on the same side as the chamfer on the teeth.
Has anyone found that when replacing a ring gear? I contacted Yesterday's Tractors to see what they say. I will let you know.
Thanks,
Scooter

Good evening Tim,
I am wondering if you found the flywheel blue print if you would please let me know the diameter of the undercut for the ring gear? I would like to compare it to mine.
Please let me know.

Thank you.
Scooter