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STUPID OME Bushing Question??

Discussion in '80-Series Tech' started by Boston Mangler, Jul 23, 2005.

  1. Boston Mangler

    Boston Mangler

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    Hey Guys

    I am getting ready to have my OME caster bushings installed by a local machine shop (i will be bringing them the control arms off of the truck) and i am trying to mark them per the supplied instructions.

    My question is this, per this picture below, is the horizontal line they are referring to using the rear bolt as the center axis and running a "Level" (using a bubble level) line to the front, or are they referring to a line between the center of the rear bolt and top of the bushing (regardless of its level relationship to the ground) as shown in the pic below.

    I am kind of confused here, the housing seems to be in the way to get a real accurate measurement

    What did you guys do?

    [​IMG]

    I know this is a stupid question and i am just misunderstanding the instructions i think. I just want to make sure i get it right!
     
  2. Rich

    Rich

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    I believe the horizontal line the diagram refers to is any line parallel to a line that passes through the axis of each axle.

    The directions could not have hardly been written less clear.
     
  3. Boston Mangler

    Boston Mangler

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    Then what does it matter if its on the rig or not, seems much easier to pull the arms and do this off of the rig, the measurements wont change, would they?
     
  4. elmariachi

    elmariachi

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    You need to use a t-square or some other right angled straight edge and mark the arms just where the vertical dashed line is in the pic. It is tough because of the housing flanges, but you have to do it that way to create the point of reference.
     
  5. landtank

    landtank SILVER Star

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    The idea is to park on a level surface and draw a plumb line from the center of the front bolt down. You'll mark the control arm just outside the bushing. This is now where you align the rubber mark on the corrected bushing. For the rear bushing place it on the arm with the mark in the opposite direction. Now rotated the rear bushing so the mark moves away from the front until the distance of the 2 bolt holes is the same as that of the axle gussetts. Now I measured the possition of the marks on the 2 bushings in relation to the 3rd rear bushing and then transfered those measurements to the second arm to ensure as close a match as possible.

    Hope this helps
     
  6. Rich

    Rich

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    The parallel line is in reference to front and rear axles. With the arm removed from the truck how would you be able to reference the axles, which are on the truck?

    Jim and Rick are correct, if the cruiser is parked on a level surface (dry lake bed would work well!), then you could use a plumb bob. As long as you park on a flat surface, level or not, you can use a carpenter's square to make the front mark.
     
  7. Boston Mangler

    Boston Mangler

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    This is what i originally thought, couldnt i just hang a plumb bob through the front bolt, if is on a level surface? I dont see why that horizontal line even comes into play, or is it just me worrying about someone non-important.

    Am i right in assuming that the horizontal line at new ride height as depicted in the diagram above, is what the control arm "should" look like on a level surface?

    Thanks, sorry for the confusion
     
  8. landtank

    landtank SILVER Star

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    It will look like what it will look like. It all depends on how much lift and what accessories you have on the truck, that would determine the ride height.

    Get passed this horizontal thing and just install the bushings using a plumb line from the center of the front bolt when parked on level ground.

    The idea is that as the ride height changes the plumb line will change in position on the leading arm. So this will cause you to rotate the bushing in a different place effecting the amount of correction you induce, the more rotation the more correction.
     
  9. Boston Mangler

    Boston Mangler

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    Thanks Rick, I am finally going to take care of this today!
     
  10. elmariachi

    elmariachi

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    Rick said it best...don't worry with the horizontal line. Once you make the mark of the vertical line ( I used a liquid paper pen so it wouldn't come off) and get the arms up on the bench, you'll see how/why that mark is important to the orientation of the new bushings.

    I assume this goes without saying but be sure you have the front diff secured so that it doesn't move around.
     
  11. Boston Mangler

    Boston Mangler

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    Thanks Jim!

    I will be removing them in a few hours
     
  12. spartan

    spartan SILVER Star

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    Make sure that whoever you take them to understands what they are, what they do and have a real machine press. The first time I had a set put in, the shop ruined them hammering them in instead of using a machine press. They wouldn't admit it and couldn't show me the machine press they told me they used. Learned another lesson on my part. I had to buy another set and find a real shop.