Announcement

Collapse
No announcement yet.

Pre-load

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Pre-load

    Well, everytime I do something I seem to have 3 more things to worry about. I went to replace the guibo and discovered a trashed center support bushing. The bearing itself seemed in, but all the rubber was gone so the drive shaft would just flop around.

    This is a project car, so I have never driven it more than 2 miles/hr.

    So I replaced the CSB following Bentley and many choice words when I could not loosen the spline clamp. When I removed the whole shaft, I needed TWO BIG pipe wrenches to turn it!

    when I put it back together, it discussed the preload, and I moved the csb housing forward and tighted to torque (16 ft lbs).
    but it really only felt like I was flexing the rubber surround inside the housing (big deal)

    Am I missing something? What is getting loaded?

    Thanks
    Ross
    Tags: None
    #2
    The pre-load is on the rubber mount for the CSB. Since in almost all cases a failure of the CSB will be the result of binding u-joints in the driveshaft, don't be surprised if this CSB soon fails. The long term fix is to replace both the CSB and the driveshaft.
    Last edited by jlevie; 02-21-2012, 04:15 PM.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

    Comment

      #3
      The pre-load is on the rubber mount for the CSB. Since in almost all cases a failure of the CSB will be the result of binding j-joints in the driveshaft, don't be surprised if this CSB soon fails. The long term fix is to replace both the CSB and the driveshaft.
      What's a j-joint? I'm going to be replacing my fuel tank soon so I'm trying to get a handle on the jobs that are able to be done while everything is out. Never heard of a j-joint, Google isn't much help. Typo?
      - Josh
      1990 325is

      Need a shift boot?
      Looking to buy shift boot frames, PM if you have one to sell

      Here's what happens when you let the internet pick your license plate

      Comment

        #4
        Sorry, there was a typo in my post that I didn't catch (now fixed). I mean u-joints and there are two sets in the drive shaft.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

        Comment

          #5
          Originally posted by jlevie View Post
          Sorry, there was a typo in my post that I didn't catch (now fixed). I mean u-joints and there are two sets in the drive shaft.
          No worries, thought it might've been a typo. This is my first euro car, wanted to make sure I wasn't missing something. Thanks Jim.
          - Josh
          1990 325is

          Need a shift boot?
          Looking to buy shift boot frames, PM if you have one to sell

          Here's what happens when you let the internet pick your license plate

          Comment

            #6
            I checked the U-joints when it was out. The front most one was very easy to pivot in all directions. The rear-most was good in one direction, and a bit stiff in the other. No clicking was heard. "So how much time do I have Doc?" Looking for an automatic driveshaft as I write this!

            I'm still a bit fuzzy on pre-loading. I put the new CSB on the shaft the same direction it was on by previous owner. Now I am worried it could be wrong. what should it be? I looked at RealOEM, as well as this post on another forum and am still unclear.

            The actual bearing sits in a hard rubber donut of sorts, which in turn is in a flexible round rubber membrane (reminiscent of a speaker surround), and then the metal housing. The hard rubber donut has a bit of a lip on one end so that the bearing fits inside it without going too far so which end does this lip go? Front of car or back?

            Thanks

            Comment

            Previous template Next
            Working...
            X