Finally got some time this weekend to work on the Jeep again. I had the front end completely torn apart this time. Good news is I found the source of my rubbing/scratching sound. The bad news is that it was because I was dumb and didn't pay attention to how my brakes were going together...
When I changed my wheel bearings, obviously you need to pull the brakes. Since I have the BBK from Black Magic, that means you pull a caliper AND a saddle to get the rotor off. Well, when I put it back together, I forgot one of the parts of the instructions, and that is to pay attention to the saddle bolts and make sure they don't poke through too far and touch the rotor. When I installed the kit the first time, I put two washer on one of the bolts to prevent that. I remember it being on the bottom. This time, I put it on the top...Because I forgot about the possibility of bolt rub and just thought I doubled them up because I was out of the "thicker" washers that were on the other bolt. Sometimes, I do that when the washer has to bridge a bigger than standard opening (like on the 15/16 brake kit with the figure 8 shaped hole).
It was
immediately apparent what was wrong when I pulled it apart. No harm, no foul, since those heavy grooves are outside the swept area of the pads. I had put the doubled up washer on the top bolt, and the bottom bolt was poked through too far and rubbing on the caliper.
I also took the opportunity to fix a couple other niggling little things up front and make one pretty big upgrade.
The first was my front locker. Its been a bit finicky to engage since I installed gears. I've checked a LOT of things that I thought might weaken the engagement of the plates, to no avail. Talking with a few others, I've gotten it narrowed down to either worn locking plates (which is basically a death sentence for the factory locker) or possibly low preload in the housing...apparently they can flex? So, since the other option is pull the carrier and replace it with an ARB, I thought I would increase the preload a bit. I borrowed a case spreader and added 0.005" a side to the carrier bearing preload. Directionally, I believe this is correct, since I was able to remove the Diff by hand. It didn't fall out, but it wasn't really tight in there either. I also noticed that I was getting just a tiny amount of leakage from the factory air tube. Only when I touched it, which tells me the original, 20 year old rubber line was starting to lose compliance. I replaced that as well with some 5/32 vacuum line I have. Finally, I looked at the routing of that line, and where the factory clamp goes.
Its very close to the plate that shifts over to engage the locker. In fact, if the clamp is not aligned correctly, I believe it may cause the airline to drag on the plate, slowing down the system.
I also rewired my locker sensor. I noticed that was torn apart a while ago. It got smashed under some articulation last time I was at an offroad part. I went through my stash of parts and found some new connector bodies, spliced in some new wire, and Viola!, my dash light works again. No pics and totally unnecessary, but I wanted to fix it.
And, for the upgrade...I got my hands on a set of Revolution Big joint axle shafts. I had some Chromoly shafts up front from G2, but I had already broken one of them (when my Diff seized) and the pass side splines fit like garbage on the unit bearing. Here is a 1350 joint axle shaft next to the Factory 5-760x joint size axle
In order to install them, I had to shorten the passenger side axle by about an 1/8" (I guess this is pretty common?) and I turned the heads of the three bolts that hold the unit bearings down from about 1.100" to 0.75." Otherwise the flange of the bolt interferes with the Yokes on the axle.
Its all back together again, with a fresh coat of black paint on most everything outside the inner C's.
I even have clearance from the saddle bolts to the rotor!
Test drive went well. I have something else making noise now. Not sure if its new though. The new tires are a lot quieter than the old ones, plus I put the hard top on, which tends to amplify those lower, growly noises. Could be an exhaust leak, or a bearing somewhere in my drivetrain. My money is on exhaust, since I can shift to neutral and the noise goes away. Put load on the drivetrain and it makes noise again. Its either that or the transmission. I checked fluid on that and its up to the correct level and bright red / not burned. No vibrations or any other sillyness either. Just a low, growly noise.