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Just curious about wheel installation... 900

A few weeks ago I took my 940 in to the automotive department of a local store in a major chain ("Where America Shops") to have a pair of tires installed. I specified that they rotate the tires front to back, and install the new tires on the front.

Over the weekend I had an occasion to remove one of the wheels, and noticed that the lug nuts were installed backward - i.e., the tapered end of the nuts were outward instead of inward. The lug nuts on the remaining three wheels were also installed backward.

I always assumed that the taper in a lug nut was designed to match the taper of the hole in the wheel so that tightening the nut would ensure that the hole was seated in the exact center. So my question is: was it possible that one or more of my wheels was off center due to this error? I wonder how much this could have contributed to vibration and/or abnormal tire wear?

I'd love to be armed with definitive data so I could go back there one last time and tear somebody a express my thoughts about their competency.








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    Just curious about wheel installation... 900

    Hello, I see that same problem a lot. Spook is right MORONS! How hard is it to tell the right and wrong side of the nut? Volvo did make it easy to do though with someone not having a full cup of brains. The other problem I see a lot is the wheel installed without lining up the pin to the hole. Next is the tires going in the wrong direction. I just had a car that the women told me was at the alingment shop three times and it still pulled. Tires were mounted in diferent directions and the tire pressure was off 7 pounds, so much for S---s. I am sure they also used a torque wrench to tighten the lugs (NOT). I would also check the weights used to balance your tires and make sure they match the rim profile, Volvo uses two types from front to back on the early style rims. Good luck with satisfaction from you know who. Pauli








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    Just curious about wheel installation... 900

    Dear rwreagan,

    May this find you well. The installer is an MIA (moron-in-action). The lug nuts should be installed tapered edge towards the hub. This does, indeed, help to center the wheel on the hub.

    An uncentered wheel will tend to bounce and/or wobble (if it is skewed top-to-bottom). This is not good. Unless you've driven a couple of thousand miles since this work was done, I'd guess that the tires haven't been much damaged.

    I'd be more concerned that anyone - who did not know how to install lug nuts - wouldn't know how to tighten them. The specification is 63 pound/feet (85nM). Over-tightened lug nuts may distort rotors.

    Had you spotted them installing the lug nuts backwards, you could have commented effectively. As you cannot prove the lug nuts were installed backwards - I presume you corrected everything, including torque - it is a waste of time to complain.

    Your report is valuable: it puts us on more on guard against MIAs in the auto business (e.g., the folks who drain the transmission,instead of the oil pan).

    Hope this helps.

    Yours faithfully,

    spook








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      Just curious about wheel installation... 900

      Spook,

      Thanks for your affirming comments. I would have been even more POed had this occurred on my 960 than the 940, as the 960 has the alloy wheels, and improper torquing can warp the rotors. As the 940 has only steel wheels, I'm sure the damage was minimal. Plus, the remaining two tires are about due for replacement anyway. I did notice, however, little flakes of metal, sort if like a fine metallic dust, around the lug nuts, from the friction between the nut and wheel.

      As you state, the lesson in this is that even supposedly reputable shops, as in a major chain of auto centers, can have morons performing the actual work on cars. You'd think that a tire and auto center that makes it's living by removing / installing wheels on an hourly basis would have at least the minimal level of competency to do something so simple and basic.

      It just convinces me more than ever that it's wise to do as much of my own basic auto maintenance as possible. I'm sure everybody on this board could tell at least one horror story about MIAs working in the quick change oil shops and such.

      To paraphrase a well-known saying in the jewelry business, "If you don't know your car, then you'd better know your mechanic."







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