Topic: Need some help - Brake panel seized melted to hub

[m00ntan]

My CB750K4 took its maiden ride and made 25 miles with no problems.  Then the edge of the brake melted and fused to the hub with globs of melted aluminum.  I switched the wheel, but I broke something else trying to get it out of traffic and I'm waiting for my date to help me push it home.

Anyone know what could make it melt onto the hub?  Anyone use spacers between the panel and hub?  Can you over torque the axle? Can dirt cause enough heat to melt aluminum?  Does anyone grease between the panel and hub?

Help.  Any ideas?

Anybody have another trued wheel for sale?

 

[csendker]

Then the edge of the barke melted and fused to the hub with globs of melted aluminum

Yeesh. Got any pictures?  I'm having a hard time envisioning "gobs of melted aluminum"...was it the caliper that melted?  You obviously generated a lot of heat, enough to melt metal.  Did you feel something dragging?  Was it 25 miles non-stop or stop-n-go?

[m00ntan]

Working on the pictures.  I want better shots.  I never seen anything like this.  I thought the panel homes against the hub and that's it.

[750goes]

Didn't you hear any sort of noises coming from the back end???

Waiting for more pictures.......if you have some of the brake drum damage may help aslo...

[m00ntan]

Just can't get the right light.  And at 128k, I hope this works.

[m00ntan]

The stuff looks like melted soider.  How hot does aluminum have to get to melt?

[csendker]

Melting point for aluminum: 660.37 º C

I would consider that kinda hot.

[m00ntan]

It rode great for 20 some miles. Last mile, I heard squeaking and figured it found some rust on the drum.  Next stop light, the panel locked up to the rim so bad, I broke the shaft, sproket or clutch trying to get it out of traffic.  I hope it's the clutch, I haven't done that yet.
 

[scunny]

I was about to say it is bloody hot. I have been looking at my rear wheel 650 but should be the same. there shouldn't be a way for the brake backplate to touch the hub, unless of course your wheel bearing has collapsed. If this melting stuff is solder, maybe a PO did a backyard repair to the backplate?

[csendker]

Bloody freakin' hot.  And to do this in a sustained manner that would actually drop 'gobs' of aluminum is very unlikely unless you happened to accidentially run over a functioning blowtorch and just didn't happen notice it.  I agree w/scunny; look for some evidence of some mystery solder somewhere.

[m00ntan]

Where to go.

I have another wheel on it, but I broke something.

The gears seam to shift fine, and they shift without the clutch.  On the center stand, 1st gear engages and spins the wheel.  But it won't excelerate and I can stop it with my hand.  Chain gaurd is off.  

Did I burn up my clutch?

[m00ntan]

Well, my date is here so we have to go and push it home.  It's uner a mile and there's only two hills. 

I think I got a buggered wheel from eBay.

If it is solder, I should be able to get the stuff out with a propane torch.  How long do you hold it before it gets to 600 degrees?

[csendker]

Hmmmmmm.

Engine runs fine.

Tranny seems to be shifting. But shifting w/out engaging the clutch?  

And when in gear, it doesn't seem to be transferring power to the rear wheel?  It does sound clutch-related.  Try playing with the clutch adjustment to see if you can change anything.  Run it all the way to one end and then the other to see if there's any change.  I assume the rear brake is not dragging?  And give the entire rear end a detailed look-over, something very bad has happened back there.

[seaweb11]

Good luck.
and dude, I hope your gay cause chicks hate pushing bikes

[csendker]

Propane torch: about 1200-1500 deg. C, but you'd have to hold it on any substantial chunk of aluminum an awful long time to get the material up to temperature.

Break-downs: My wife just laughs at me and tells me to start walking.  Help push?  Ha, ha, ha, ha, ha......

[m00ntan]

She loves me...or can't pay the mortage and tuition herself.

[cben750f0]

i ran out of fuel once, and my missus just bought the fuel, battery was flat, she sat there and laughed her head off at me kick starting the bike..... said something about me ' looking like and epoleptic muppet of crack'..... god love em....


 peace

[m00ntan]

Well, it's home.  I had to stop a dozen times.  I can't push them like I used to.

Funny thing is, my wife pushed too.  And my daughter followed in her car with hazard lights.  She had her first traffic stop from the police. 
He looked at the old sweaty people pushing a five hunbdred pound historic tag, and all he wanted to know is "How far to go?" 
"Six blocks to miller time, officer."

You really don't know how many hills there are until you're pushing.

[m00ntan]

So how do you inspect a clutch?

[bryanj]

Check your rear wheel bearings, any play lets the brake plate rub. Clutch can be checked, physically, by removind the chrome cover over the adjuster then the alloy clutch cover

[Honda CBer]

Good luck.
and dude, I hope your gay cause chicks hate pushing bikes Grin Grin Grin

LO-freakin-L

the monitor nearly took a coffee bath for that one...

yet, truer words have seldom been spoken...

[750goes]

Any more results  - any more pictures ?

[m00ntan]

Sorry, I haven't looked at the wheel.  It's a matter of priorities.  I have to fix the clutch first.

I banged the screws out tonight and got as far as the locknut to keep the undetermined out. 

Clymer's no help and Hanes asks me to rig an 11/16 socket with a soldering rod.

Amyone have a better idea?

While I'm here, I have the springs out and in gear.  Is the clutch suppsed to be turning free?

[m00ntan]

I put the new clutch plates in and it works, but I have the clutch rattle, chain chugging, hard downshift, can't find neutral problems that you all tell me to go to the technical library to research.  So I've been working on the Buicks until I can get to the articles that tell me how to stack those plates.  Barnett plates, seven metal and six friction, for $105.  The oversized plate for later models is there, if anybody wants it.

Bought a new brake panel, Takes a good picture, http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=160031967696.  Comes from a 1977.  Haven't checked the fiche.  I think it's the same.

Bought a wheel to play with, http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270025851714.  Just because I forgot and they crossed in the mail.  Maybe I can learn to true and spoke.

Can anyone tell me about clutches?  The Barnett metal plates came with markings on one spline and I lined them up in the outer clutch.  But I didn't see anything about inner or outer sides, so the friction plates went in however they came out of the oil soak.

Also the notched washer, 90432-300-303, seemed to float between the larger shaft notches for the outer clutch and the shaft notches for the inner clutch.  I don't think that's right.

Can anyone help?