Anyone fitted a flywheel ring gear?

[burgundyben]

I got a 3 syncro 5 bearing flywheel to fit in my 1800 5 speed conversion.

It needs a new ring gear, I got one today.

I got the old one off easy by drilling some holes and then cutting through the remaining metal with a chisel and off it popped.

I put the new one in our oven with it on its highest setting, waited for the light to go out, showing its reached max temp, gave it ten more mins and took it out to the garage to try and fit it, its about zero centigrade outside tonight so flywheel should be pretty well shrunk. It was kind of close but I could not get it on. I tried a couple of times but no luck.

Anyone done this? How hot do they need to be?

Ta.

Ben

 

[jlaird]

Easy way is to take to machine shop and give em 10 bucks.

Otherwise move faster from oven to garage and have your hammer ready.

 

[burgundyben]

move faster from oven to garage

I reckon you might be onto something!

 

[PAUL161]

We used to put 6 foot ring gears on truck crane turntables by heating the ring gear to 800 degrees and packing the flange in dry ice. You have to be quick. 20, 30 degrees is not cold enough to shrink anything the amount you need. If it was, it wouldn't be tight enough. Without the right equipment to do the job properly, I'd do what Jack suggests and send it out. If it was mine, I'd have the balance checked also after the gear was installed. A high frequency vibration you don't need.

 

[DrEntropy]

Done it once with the oven to 450*F, the flywheel on below zero concrete. Moved fast enuff but it took a bit of whacking. ISTR three shots. Mom was NOT impressed. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif

Now the machine shop gets the job.

 

[V6MGB]

Did this many , many years ago and never again.

The dry ice and oven method works but it really was a lot of mucking around for a result which would have cost a small amount of money to pay to have done.

One point: Make sure the ring gear is the right way round. Some only go on one way and are usually indicated by an arrow or mark of some sort.

Good luck , Pete.

 

[Bruce74B]

Make sure to clean both surfaces of all particles that will make it more difficult to mate the two pieces. Give the flywheel once more wipe while heating the ring and the two should go togther smoothy if you are prepared and move quickly...good luck!

 

[zblu]

Second you V6MGB /bcforum/images/%%GRAEMLIN_URL%%/smile.gif

 

[tony barnhill]

Not worth the hassle to save a few bucks - take it to a machine shop...they're doing one for me right now.

 

[burgundyben]

I dropped it off at the engineering shop this morning....

 

[piman]

Hello all,

I've done two or three, no heating or cooling. It does take a bit of patience and alignment given the large diameter and small depth.
You will be struggling with a hot bit of metal to get it aligned correctly to drive it on, else it has to be so hot to slip on.

Alec

 

[JeffS]

I helped with mine at the machine shop last year. Old one came off with torch work and sledge. New one went on relatively easy with torch heat (slow, even, gradual torch work) and a frozen center. It didn't exactly fall into place, but only took a few minutes.

 

[burgundyben]

Collected it this morning, he must have got it pretty hot as its gone blue!

 

[piman]

Hello Ben,

i don't like the sound of the blue, I hope that it hasn't softened the teeth?

Alec

 

[sparkydave]

Alec brings up a good point; did you happen to see this article on changing a ring gear? The author mentions cooling it with oil to avoid having it become soft.

https://www.mgaguru.com/mgtech/clutch/ft_101.htm