"baking" parts-

Might possibly be the stupidest question ever, but then again I am kinda stoopid
looking at converting my round back spindles to disc brakes, the plans I am working off say to take the inner spacer and heat it in the oven for 30 minutes before sliding it onto the spindle - what temp would you do this at? 150, 400, what?? What temp is it gonna take to expand the spacer enough so it'll slide on easier? thanks-

 

I crank it up to 200 and also throw the spindle in a bag and then in the freezer for 3 hours or so, you might want to have a pair of heavy leather gloves on ready for the task, the spacers might get a little warm to the touch....

 

cool - thanks

anyone have any advise on using the torch to heat an axle to get frozen spring perches out?
I assume I want to heat the axle boss to expand it and try not to heat the perch itself too much??

 

The very, very most important technical aspect of this is to be SURE your wife is out long enough to finish the job AND air the house.

 

How much of an interference fit do you have ?
That dictates the temperature difference between the parts.

If you can post accurate numbers,I can calculate the temp.

 

the i.d. of the spacer is 1.188", the o.d. of the spindle is ???, dont have one handy to measure right now...

 

The exact directions I've got that came with my disc brake kit say:

"Heat in oven to 450 degrees before installing on spindle. May require tapping on with a short length of suitable diameter pipe. Be sure rounded inside diameter is toward the kingpin, and that the bushing and kingpin are free of burrs."

Basically, it says to heat to 450 degrees, but it doesn't say anything about how long it'll take to get it there. I'd say heat it for 30 minutes or so?

 

a minute or two with a propane torch is enough to do it.no need to freeze the spindles, just that they are cool. grab the heated sleeve with a large channel locks and slide them on...work fast

if you goof up you can always press them

 

I tried the heating thing this week and it didn't work. Ended up using the press at work to get the adapters on.

- Primo

 

Didn't come with microwave instructions did it?

 

I second what Bruce Lancaster had to say! 30 some odd years ago before there was HPC or Cast Blast paint, I was told to bake my exhaust manifolds in the oven, so they wouldn't rust, and periodically "baste" them with motor oil. So I did. BIG MISTAKE !! It took weeks to air out the house and get back in the good graces of my wife. They still rusted! live-n-learn.

 

I'm trying to heat a set up in the kitchen oven right now... I want to make this thing into a roller soon!

If this doesn't work, I'll probably try to talk the neighbor into bringing his torch over and heating the adapters up for me.

 

Heated'em up to 550 degrees, ran from the kitchen to the spindles, started tapping them on, and this is as far as I was able to get. Now I've got to find someone local with a portable torch who'll drop by and give me a heated hand in exchange for beer.

You can see they've still got about 1/2" to go before being seated properly.

 

mine slide right on... but the otherside was a 1/2 inch short. I think if I did one side at a time instead of try both right out of the oven I would have gotten them both to slide right on.

 

Thats exactly what happened to me. The press took quick care of that.

- Primo

 

I guess the spindles are already on the axle? Freezing the spindles would have made this a bit easier.
When using the torch it might pay to use a heat sink on the spindle to stop it expanding quite as much. Or you could just have them pressed on.
Doc.

 

I'm probably going to get out there today and pull the spindles off and take them somewhere to have the adapter pressed on. Hindsight being 20/20, I'da done that in the very first place.

 

I tried freezing the spindles and heating the bushing but it did not seat. I ended up like goztrider so I did the press method and presto disc brake ready spindles.

Primo

 

Sounds like these bushings have too much of an interference fit.

 

goztrider. I am in maine right at the moment, but I will be home tomorrow afternoon if you want to come by tomorrow evening or saturday and use my press.

 

Hey Bentley! Hows that boy o'yers doing?

I went ahead today and ran over to a buddy's shop and had them pressed on. Right now, the old dog is sitting on it's new feet, awaiting Tulsa Auto Spring to finish the main leaf. Once that's done, I'll be ready to set the motor and tranny into place.