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Bad bevel gear? Transmission problem? V70-XC70 1998

posted by  kcookvt on  Fri Aug 30 21:11 CST 2013
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last visit: Tue Aug 5 19:59 CST 2014
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My 1998 V70 AWD (about 161000 miles) is making some odd noises, and I cannot really tell where they are coming from. From the driver's seat, it sounds as though it is coming from just in front of the shifter, and with the windows open it seems to come more from the right side than the left. It is a clicking or rattling noise. I am wondering whether anyone knows what a bevel gear that is going/has gone bad sounds like, or, worse, what a bad transmission sounds like.








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    Bad bevel gear? Transmission problem? V70-XC70 1998

    posted by  someone claiming to be Soyomakate on  Fri Sep 6 08:34 CST 2013 [RELATED]

    This exact same thing has happened to us a few times..
    and its allways been the Rear Drive Axle front joint. (because its so close to a heat source)

    if so all you need is this
    http://www.ebay.com/itm/Volvo-AWD-or-V70-XC-drive-shaft-c-v-joint-kit-/161095984478

    and some elbow grease as its a bit fiddly to get it off








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    Bad bevel gear? Transmission problem? V70-XC70 1998

    posted by  KlausC on  Sat Aug 31 09:20 CST 2013
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    Before you get too carried away, check the heat shield above the exhaust. It can rust and fall down on the prop shaft. Bevel gears don't make clicking sounds.

    I assume you are driving slowly, so does the noise change with direction changes or accelleration?







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      Bad bevel gear? Transmission problem? V70-XC70 1998

      posted by  kcookvt on  Sat Aug 31 12:19 CST 2013
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      Hi Klaus,

      I do tend to get carried away: I get a headache and diagnose myself with a brain tumor. :)

      The noise tends to change with direction changes (especially right turns)and with acceleration, both, but it doesn't change a lot, just gets maybe a little louder.

      What sound (if any) does a failing bevel gear make? Would you recommend I have the bevel gear oil changed, or, assuming that the noise is NOT the bevel gear or the transmission, should I just leave well enough alone?

      Thanks, as always!







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        Bad bevel gear? Transmission problem? V70-XC70 1998

        posted by  KlausC on  Sat Aug 31 12:53 CST 2013
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        The bevel gear oil is supposed to be drained every 50K miles. There is a procedure to make this easier than trying to syphon it out from the filler hole:

        http://volvospeed.com/volvo_repairs_how_tos/transmissions_driveshafts/awd_bevel_gear_service.html

        Any good mechanic can do this, but I would perfer to DIY or an experianced Volvo guy who has done this before. I don't have a 90degree drill.

        Could your noise come from a bad front axle CV joint? Bad bearing?

        If all else fails, leave the bevel gear on the tranny and remove the prop shaft. This is easy to do and if you have storage, you can always put it back on. Just mark it up real good so it goes back on without being out of balance.







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          Bad bevel gear? Transmission problem? V70-XC70 1998

          posted by  kcookvt on  Sun Sep 1 16:06 CST 2013
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          Thanks again, Klaus.

          Would a bad bevel gear make a noise, or does is just quietly stop working?

          Also, on another note, how often should one have the transmission flushed? I have both the '98 v70 AWD and a 2004 xc90 2.5 (great car, murder on tires, bad wheel bearings)?

          Thanks







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            Bad bevel gear? Transmission problem? V70-XC70 1998

            posted by  KlausC on  Sun Sep 1 17:21 CST 2013
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            The bevel gear never makes noise until it is dead, then it will make grinding noise at low speed that you can feel in the seat of your pants.

            The tranny fluid and bevel gear fluid should be flushed at 100K (max) and about 30K intervals after that.







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              Bad bevel gear? Transmission problem? V70-XC70 1998

              posted by  sherm on  Tue Sep 10 18:35 CST 2013
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              Go ahead and treat the Brick's slushbox to a Magnafine filter while you are at it. goes inline on way to the radiator. $25 cheap insurance.
              --
              The Family Fleet '90 745 16v; '90 745 GLE; 96 855T; 99 XC, collectively approaching 900,000mi and going strong.








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          Could this be a bad CV joint? V70-XC70 1998

          posted by  rancher rick on  Sat Aug 31 18:04 CST 2013
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          Noticed lately that what seems to be the tranny shifting hard when going from second into first aproaching a stop light. Also when shifting from P into R. This does not happen all the tine & in fact, infrequently.
          I`m hoping, of course, that it`s not tranny issues & something less expensive.
          Love this XC70!
          Thanks,
          Rich








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            Could this be a bad CV joint? V70-XC70 1998

            posted by  KlausC on  Sat Aug 31 18:30 CST 2013
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            Is your tranny software up to date? When was the last time it was flushed? Check the fluid for color and level.

            Not a CV, that would click when you stepped on the brake, or brake to gas.

            Also check the engine mounts, just to be on the safe side.

            It is almost time to start looking for a 2013-14 XC60 for your wife. The 3 litre turbo has 300bhp, and drives great.








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              Could this be a bad CV joint? V70-XC70 1998

              posted by  rancher rick on  Sun Sep 1 09:27 CST 2013
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              last visit: Thu Sep 25 21:22 CST 2014
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              Thanks for your response, Klaus.
              OK, so I can eliminate the bad CV joint. Will look into the other possibilities.
              You`re right about the XC60......we`ve been talking about that model for awhile now. Have you driven one? We`ve looked at them in the dealer showroom but $60K is a little "rich" for the budget right now.
              Rich







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