Correct and incorrect N series ring gear examples

Good evening,
I am posting photos and information regarding the different designs of N series ring gears I have found for sale. The first one I bought was from Yesterday's Tractor and I contacted them and they replied the manufacture of it says it is correct.
I believe the bevel is on the wrong face of the teeth and the big chamfer on the front (engine side) will ride up on the groove/undercut on the flywheel possibly causing a little expansion to result in slippage.
I do know Yesterday's Tractor used to sell them with the teeth bevels and ID chamfer on the same side because it is of topic in older postings.

The gear from ebay I believe to be correct.

There are also gears with no bevel on the teeth, or bevels on both sides of the gear.

Use this information how you wish or provide detail.
Thank you.
Scooter

Okay,
Someone who Knows, not guessing or has an opinion. Please post the Correct Answer to this question. As I need a ring gear for an 8N also.

The gear I put on my 9n back in 06 didn't have bevel teeth they were stright. I've not had a single problem.

Also, I should have provided names for the photos.
The top one is the transmission side of the two gears and the bottom one is the same two gears engine side.
Scooter

Primarily, the reason for the chamfer on
one side of the ID ts to allow for a less-
than square corner on the flywheel.
I suspect the one sided gear teeth are
just fine as the starter gear only engages
it one way. Twould be cheaper to
manufacture a one sided tooth than a two
sided.
For what it's worth, if I had a ring gear
that was two sided and worn a bit I would
have no qualms about chamfering that
inside corner with an angle grinder a bit
and using it backwards. It would last
another 40 years and cost you only the
price of the oxy acetylene to turn it
around.

Thank you for the replies,
Perhaps someone with an original blue print will weigh in and put it to rest.
Thank you.
Scooter

Yes, any chamfer on the ID is okay -you don't want a sharp corner so it seats properly. I do own an original blueprint of the flywheel and the ringgear, but I cannot post them legally. The flywheel ringgear seat shows a 1/64" (.015") corner radius. A chamfer on the ID of the ringgear will ensure less interference and the gear popping up from not seating flat. believe, I turned several thousands of 6375 flywheels in my early NC Turning days and assembled them as well. It would be very difficult to try and machine a chamfer on a ringgear as it is tempered hardened steel not to mention an interrupted cut. I suspect most new gears will work fine sold today -just buy from a reputable dealer and leave the fleabay stuff to the Russians and Chinese... ; > )

Tim Daley(MI)

Thank you for the replies,
I notice no one has commented on my pictures showing which side left to right the bevel on the teeth should. The one from ebay came from Central Tractor, not sure how their parts rated.
I believe the one from Central to be correct and that it does matter which face of the tooth has the bevel.
I also believe that having a fairly sharp edge on the engine side is essential to keeping the gear in the undercut since the undercut is shallow.

I have pictures of N's that have not been split for years and appear to have the original or at least very old ring gear on them and they have the bevel on the same side of the tooth as one from Central.
I have also compared the bevel side to a lot of other brands of engines (and considered the rotation and Bendix engagement) to conclude what I believe is correct.
I have not bothered asking who the original manufacturer of the Yesterday's Tractor one is and I do not want to pick on YT specifically since they do not make them, but I do know some of the ring gears are made in India and that maker lists some of the specifications.
This has been an interesting learning experience at least, I have never paid attention to starter gears.
Any takers to weigh in on which face the bevel goes on? I think having it on the side the YT one is bad because that is the driven face and probably causes the Bendix to try to disengage while it is trying to engage. Flip your Briggs engine over and have a look.
Thank you,
Scooter

Good evening,
I just installed the ring gear marked ebay. I did measure the ID and found it to be .010" bigger than what others advertise and the YT one measures. I think that bigger ID could be a problem, but it is the same as the one I took off ( I split it to remove it and worm clamped it back together to measure it.

So, not everything was right about the one I used.
I am not going to automatically weld it like some people do, I am going to take one for the team and use green penetrating Loctite. Since the gear is thin and Loctite is anaerobic, I am going to wrap butyl tape around the joint after I apply the Loctite to seal off oxygen and ensure it cures.
Loctite on a 12" diameter can take a lot of torque.
I will let everyone know how this goes. It will be weeks before the engine is running, so be patient.
Thank you.
Scooter

Good evening Copperhead, what have you decided?
I bought a 1947 ford engine manual covering the N engine just for the ring gear picture and have attached it and a picture of a split tractor to show it is the same. I believe the factory picture is enough to settle it.
Good luck,
Scooter

Good morning,
I will sell the ring gear I got from YT to anyone in the lower 48 states for $10 plus the lowest USPS rate possible if you think you want it.
I could send it back since I will not use it, but they only use UPS and that costs more than it is worth.
Send me your e-mail address and I will quote shipping for you.
Just make sure you have read this whole article because I will not take it back or warranty it.
You will receive the one in the attached picture.
Good luck.
Scooter

(quoted from post at 10:59:50 08/05/17)
I could send it back since I will not use it, but they only use UPS and that costs more than it is worth.

Click to expand...

i don't understand this. it should not matter what carrier YT ships with, as they are not doing the shipping when u send it back. are u saying they will refuse a package sent to them via the USPS? :?

The return instructions say to ship with UPS and that is not cost effective for smaller packages unless you have a business account.
It is common for businesses to require a certain non USPS carrier for returns since that is their preferred service.
I am disappointed YT refuses to pay return shipping on the gear since I have provided them an undisputable factory photo and a picture of a split tractor showing the gear teeth the way I am saying they are supposed to be.

(quoted from post at 16:12:09 08/05/17) The return instructions say to ship with UPS and that is not cost effective for smaller packages unless you have a business account.
It is common for businesses to require a certain non USPS carrier for returns since that is their preferred service.
I am disappointed YT refuses to pay return shipping on the gear since I have provided them an undisputable factory photo and a picture of a split tractor showing the gear teeth the way I am saying they are supposed to be.

Click to expand...

ouch. if it's any consolation, you're probably handling this better than i would.

Good evening,
So it has been 3 years since I installed the ring gear using green penetrating loctite instead of welding it like others do.
The ring gear has not moved and I think welding the gear on is damaging and unnecessary.

Follow my instructions on how I did it, except I did not use butyl tape, I used household sealant and just left it.

Scooter