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Flywheel ring gear install question

O

old

Well-known Member
Location
Camdenton Missouri
Ok I have to install a new ring gear on a Ferguson TO20. Can I stick the flywheel in the freezer and the ring gear in the oven at say 500 degrees and have it slip on or do I need a lot more heat?? One of those things I have never had to do up till now.
Thanks
Hobby farm
 
Old I think 500 is too hot. some heat treat can be affected at that temp. go with 400, it will be plenty hot. JimN
 
Just put a ring gear on recently. Didn't even put the flywheel in the freezer. Simply took a torch and slowly warmed up the ring. It expanded significantly (about 1/2" in Dia) and just dropped on to the flywheel. It almost got too hot and too big. After setting about 20-30 minutes, it was tight as can be.
 
I've done 2 Case tractors, VAC & 310, in last 2 years, 1 flip and one new, should be about the same as the Ferggie.

Service manual states heat to 560° - 570°F, place on flywheel and quench in water immediately.

I heated in oven set at 550°F one hour on flat surface (grill), laid it on the flywheel shoulder and just sprayed it with a water hose.

I don't think you need that much heat or for that long. The ring gears expanded to good 1/16" larger than the diameter of the flywheel. You have plenty of time to position or rotate how ever you want it.

Joe
 
Hey, here's one I can answer. I just went through this on a 9n ford a couple of years ago. Flywheel in the freezer is ok but the oven is a no go. Wont get hot enough. We tried it about 5 times and it wasn't even close. My dad was there and we got looking at the barbeque grille. Just your regular old cheapie charbroil wal mart gas grille that I quit using a few years ago. Dropped the ring gear in the gas grille for about 15 minutes and it literally fell right on the flywheel. I couldn't believe it was that much hotter than the oven but it was. Works great. I tack welded it in four places around the diameter after I was done. Good luck!
 
5-minute job at most.

Heat the ring gear with your rosebud and just drop it on the flywheel via a pair of tongs.

They expand like crazy when heated and cinch tight when they cool.

Allan
 
I do as Allen says, I just set the ring gear on the flywheel and heat it evenly with the torch till it just drops into place, it doesn't need to be red hot. I dont suggest tacking it in place with the welder though, the shrink fit is plenty tight . Have fun!
 
Hey old, does the ring gear go on the flywheel from the clutch side? If so it is the early type flywheel and the starter can knock the ring gear off over time. I ask because you said the old ring gear had come off and was jamming things up. They changed the flywheel design early on to fix this problem.

Dan
 
Yes its an early one so yep thats a problem. I figure I'll use ni-rod and weld it one in a few places so maybe it will stay on. The last time it was replaced was 20 or so years ago and who ever did it then had welded it on also but the welds broke
 
I don't have a rose bud so that in its self is a problem. Thats why I figured the oven would do the job plus freezing the flywheel should make it almost fall on
 
When we put pins in Cat tracks we would heat the track with a torch then cool it with water after putting the pin in makes them tight a (well you know).
Walt
 
The two I've changed I didn't bother about the freezer part, but I did heat the ring gear in the oven at 450 for about a half-hour. Popped right on.

The only other hints I can think of is to send momma and anyone who might talk out on some errand or other while you're toastin' your parts, and clean off any cosmolene or grease or oil BEFORE you put 'em in the oven. Do those two things and you're much less apt to get caught.
 
Old,

You're groomin' yourself for a long, long day.

Take both pieces and find someone with a torch; I've used just a plain cutting tip and it also works well.

Allan
 
My wife never gives me any problems when it comes to do things like that. Shoot I do 90% of the cooking so if she gives me to much of a hard time she knows I'll go on strike LOL
 
Hey Old,Just set the new gear upon a couple of metal blocks or tin cans or anything metal.Fire up that torch and just start going around it with heat.It ain't gotta be red hot.Heat it good and take a pair of pliers and pick it up.Set it on the flywheel and let it cool.I've changed a bunch over the years and never had one that did'nt stay on.No need to make a simple job so complicated.Its a lot easier to pick that torch head than it is to put that heavy flywheel in the freezer.
 
Common problem on the older Ferguson for the ring gear to pop off of them because of the starter drive pushing them off so I know I will have to tack weld it in place
 
Well now all I need to do is pull the clutch assembly off the engine then the flywheel and bring it in the house. I'd use the torch method but figure in the long run the oven would be cheaper and safer. I do plan to tack weld it on because this is one of those early Ferguson's that have the problem with the starter drive knocking the rear gear off. I plan to use NI-rod when I weld it
Hobby farm
 
I'm glad I'm not the only one that uses the sink, stove, oven, and dishwasher for occasional tractor parts!

soundguy
 
Dad used the oven over 50 years ago, for the WC tractors. Nice, uniform heat compared to a torch- whcih he never had. Quick trip to the shop and popped it on. Now with welders in the shop, wired for a plug that matches an old stove- ideal reason to keep the stove in the shop. Pizza is the second reason!.
 
I just changed one on an 8N Ford. I had the gear hanging on my vise and just warmed it up with the cutting head. It was like someone else said. Plenty of time to get it where you want it before it cools and sets up tight. The damaged one had been welded. All of the welds were cracked. I would not recommend welding on a cast iron flywheel.
 
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