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Caster off, strut mount reversed? 700 1986

Hey all-

I just got back from the tire shop that's always done a great job with alignments, even on problem cars. Seems my cars always have problems.

So '86 745T 218K, they call me up to the desk to show me how bad my car is. They're reporting that the pass wheel is positive 2 degrees castor, and off 1 degree camber on both sides. The camber I'm not worried about, if I keep this car it's getting a strut tower brace.

Anyhow the reason for the alignment was new radius rod bushings and new tie rod ends. Car actually tracked quite well driving it to the shop.

They tell me the car's way out, we both looked at it and couldn't see any obvious damage, so they did their best and it now pulls right on the highway. Thanks a lot guys.

I stop in at my parts guy's place on the way home and he says maybe it's a bad strut mount. I'd never heard any clunking but figured who knows?

So I get home, pop the hood, and WHOA! The driver's side upper strut mount has the strut nut biased towards the rear of the car, and the passenger side is biased to the front! I mean this is so obvious I'm surprised I never saw it before- I'm a little embarrassed. It looks like the passenger side upper strut mount is reversed, I'm checking all the books to be sure, but can anyone confirm? I'm planning on dropping that side and seeing if I can simply compress the strut assembly and spin it 180 degrees and reinstall.

Here's what worries me- did someone do this intentionally to make up for some OTHER castor problem? The alignment guys said 2 degrees, but I've got to think this sort of reversal would result in more than 2 degrees. I guess it depends on where you measure it, no?

Any advice, warnings, finger-pointing welcome.

Thanks
-Dylan








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    Caster off, strut mount reversed? 700 1986

    Id think 2 degrees is just about right for putting it on backwards, i know i did it once when putting my struts back in fortunally i noticed it before i finished the job,. You might not have to compress the spring, if its possible you may be able to just pull the unit out and try to twist the top plate, if there installed in correctly normally the spring is not setting on that plate correctly either and if its not you should be able to spin it into position and the spring will seat propery, though thats only if the spring is not seated correctly now.








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      Caster off, strut mount reversed? 700 1986

      Thanks, I guess someone else ran into the same problem and didn't catch it. I'll keep an eye on all the other 740s I run into.

      I was a little surprised by the effort required to turn the strut rod nut to rotate the upper mount 180 degrees. I expected it to turn more freely, like the upper bearings in my 240s.

      Does this surprise anyone else?

      Thanks for the input-
      -Dylan








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    Read the book dylant 700 1986

    Yeah so that's what I just did- Haynes had a great little warning in there about reversing the offset of the upper strut mount. Photo clearly showed the offset is to the rear of the car, and there is also a note that "correct- 5 degrees castor, reversed- 3 degrees" So there's my 2 degrees.

    I'm following the directions on the FAQ for dropping the assembly, and already learned you can't simply spin the upper strut mount. I'm going to release the strut rod nut after fitting a spring compressor and try it then. I'm off to buy some larger metric sockets and maybe an electric impact gun. Great excuse to buy a tool.

    Tomorrow I think I'm stopping in at the tire shop to let them in on this one, and have the alignment checked- again. It seems like I never do an alignment just once...


    -Dylan








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      Read the book dylant 700 1986

      Unless the spring is not seated properly on the strut, I don't think you have to compress the spring. Shouldn't the mount spin freely once the whole thing (strut, spring & mount) is no longer attached to the chassis?

      Jeff Pierce
      --
      '92 Mercedes 190E (my daily driver), '93 945 Turbo (a kickass family car), '53 Willys-Overland Pickup (my snow-plow truck/conversation piece)








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        Read the book dylant 700 1986

        I'll try it again, but it didn't the first time. I just read the Haynes (instead of skimming through the pretty pictures) and it looks like you're right. Let's hope so. I'm off to the garage...

        Thanks-
        -Dylan








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          Read the book dylant 700 1986

          Well let me clarify that. There is a bearing in the strut mount. That bearing allows the strut to spin while the mount is attached to the chassis. So if it doesn't spin, then you may have a bad bearing or perhaps it was assembled incorrectly.

          Jeff Pierce
          --
          '92 Mercedes 190E (my daily driver), '93 945 Turbo (a kickass family car), '53 Willys-Overland Pickup (my snow-plow truck/conversation piece)








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            Read the book dylant 700 1986

            Thanks for the clarification-
            I just got back from a road test. Thanks for making the process quicker- I released the assembly intact, put a socket and a bar on the strut nut, and turned the upper mount 180. This required some effort, but not muscle.

            The good news is, the caster problem should be solved. The bad news is, the car still pulls to the right a bit. It wasn't doing that when I drove it into the shop. I'm going back tomorrow to tell them what I corrected and see if they'll check the alignment again. I earned a new set of tires for my 855T hitting a pothole shopping for tools tonight. Looks like I might begin to know this shop better.

            Thanks again for the help-
            -Dylan







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