disc brakes done! (pic)

got em done, wound up with .067 worth of shim in the bearing but now they are all good. Gotta get new calipers now though!


Bubba

 

Dumb question or coming in late: Why did you have to shimm the bearing? What did you use to shim it? AM

 

Looks good Bubba!

 

Any bearing/race part number info would be greatly appreciated, I'm about to attempt the conversion myself also. Thanks.

 

there are pics on my website that show the shim.. made em from a willy's hood... Had to shim to get the rotor out away from the backing plate so it would no crown the inner brake pad..


bearing and race part numbers are as follows..

timken

LM501349
LM501310

seal is national

8430S

BUBBA

http://home.earthlink.net/~slicktea/index.html

 

No sweat! I just got the page done this evening so that pic just went up...

BUBBA

 

If you use inner race # LM 501311 you don't have to shim it. It centers the rotor properly as the race is the right thickness. That's what I used on mine and it's worked great for about 8 years now. You have to use the National seal though as with that race you can't drive the seal on all the way or it hits the bearing. Drive it in until just before the inner rubber lip hits the bearing. The seal will hold on fine and seal ok this way. Nickmil.

 

Here's a shot of mine. This is old, now I have 11" drums all around.

 

I searched the race thing a lot. there are two races that fit one with a total thickness (including the bearing) of .715 and another of .770, I already had the .770 in there. I even machined the back of the hub to get it flat which helped me in the right direction and it still dragged bad on the inner shoe. I dunno why mine was different, maybe my hubs are different, they are mismatched hubs anyhow, the left one was flat on the back side and the right was not so I had them both machined to the same thickness to get the back of the one flat and for consistency sake. Like I said I have no idea why mine was different but the shims fixed it up. I really did not need to shim as much as I did, .020 woulda fixed it but it moved the caliper further onto the two bushings that they slide on, closer to the backing plate.. I did make sure that my seal was still sufficiently engaging the face it rides on though so as not to "over shim"


BUBBA

 

There are two drum brake bearing hubs. One that uses a "thick" inner bearing and one that uses the "thin" inner bearing. The thin inner bearing is the earlier one and what I've run into is the step for the inner race to but up against is machined in a different location to locate the bearing hub correctly for the thin bearing. On this type they use the same bearing for the inner as for the outer. These are the early bearing hubs with the back of the hub machined for the old Lockheed drum brakes where the drum is on the back side of the hub. The later drum brake version is not machined on the back for a drum or rotor and uses a thicker bearing on the inside than on the outside. There is a third bearing hub commonly referred to as a "disc brake hub" which is machined for the rotor on the back side and the thicker inner bearing and race. These will also accept the drums for drum brakes. Sounds like you may have one early and one later drum brake bearing hub. The race I mentioned above is to replace the race used with the thicker bearing to get the spacing correct for the rotor. I don't know what application it was used in but is available from any parts house. May have to order it though. I never tried it with the hub that uses the thinner inner bearing so can't comment on that. The race I mentioned is not a stock Jeep part so the chances of someone having one laying around off of a Jeep is negligible. Nickmil.

 

Daaaaaang! Now that I was not aware of! I can tell you I have the thicker races in both sides but I think you are right about the hubs.. anyhow I had them machined to match (flange thickness) but I did not reference to the race fit.. anyhow it's all squared away now, just waiting on NAPA to get my calipers and pads.. Tomorrow.. Thanks for the help! One more project on the list done and one step closer to completion. I am picking up the rest of my steel Thursday so I can finish the cage.


BUBBA