640 Rear Axle Collar Temperature?

pburchett

Member
I’m ready to install the rear axle collars on my 640. My ford manual states “Heat it to black red” and place a pipe over the axle and onto the collar to hold it till the collar cools and seats. Since I don’t have a torch I am going to take it to school to the ag shop. The ag teacher is a young pup and like me has not done this before. I did read that too hot will ruin the collar, and of course too cool and it won’t go on.
I watched a you tube video where the guy puts an axle collar on a Ferguson but he heated it till it looked very bright yellow-orange.

I found this chart, but it might not be much use vs real world applications.

C----- F---- Color
400 -- 752 -- Red heat, visible in the dark
474 -- 885 -- Red heat, visible in the twilight
525 -- 975 -- Red heat, visible in the daylight
581 -- 1077 - Red heat, visible in the sunlight
700 -- 1292 - Dark red
800 -- 1472 - Dull cherry-red
900 -- 1652 - Cherry-red
1000 - 1832 - Bright cherry-red
1100 - 2012 - Orange-red

Any suggestions from those experienced?
 
Buy yourself a $10 toaster oven at Walmart and heat that thing to 300 degrees for an hour or so. Before you
take it out and drop it on, have a piece of pipe or a big punch and hammer ready to beat it the final
distance if it doesn't slip all the way down.

One thing is for sure, you don't want to heat it red hot!
 

Like a starter ring gear I get'em blue hot I would guess 6 to 700 degrees... On a warm day my gas grill will heat to 6/700 when I do a differential ring gear its done in about 15 min its on the edge of blue hot..

I have over done a collar it never gave me a problem YMMV... Maybe some one can explain why some metals turn blue hot and some don't. Starter ring gears, differential ring gears and collars do... The only explanation I have is I keep the heat moving are the heat is not directly applied to the metal because I don't want a centralized hot spot...
 
An old guy helped me replace mine.
I had the pleasure of drilling and
busting off the old one. Got new
bearings and seals on. Then he
said come back tomorrow and we
will heat collar and put it on. He
got up early and did it with out
me. Said you don't want to not get
it all the way on the first shot.
You won't get a second
chance......
 
I got it on! Thanks for the help/suggestions. I put in on a support over a turkey fryer burner. I went to black red red color in no time. I slid it on the axle and drove it down with a section of pipe.
 

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