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Prop shaft/axle groaning - where to start 200 1985

posted by  neilj on  Fri Oct 29 10:28 CST 2004
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Upto 40 mph, my 240 drives normally, then the groaning and vibration starts, gets worse to about 55mph (vibration coming up from the rear through the floor), then calms down after 60mph. Most comfortable at 70mph/2500rpm - any more and the dash starts vibrating too, and any less and the groaning kicks in again.

I have visually inspected a few times and see nothing out of the ordinary; I need some tips on what to look for. Any ideas??

Thanks

Neil








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    Prop shaft/axle groaning - where to start 200 1985

    posted by  Volvodad on  Fri Oct 29 11:24 CST 2004
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    last visit: Thu Oct 23 16:18 CST 2014
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    Sounds like worn U-joints. Does the vibration also occur under brisk accel. in low gear? Is there a "clink" noise when you select reverse in an automatic - or first start to engage the clutch in reverse in a manual? If you have one or both of these symptoms it's almost certain to be U-jts. If you can't access the underside and check them yourself, any repair shop should be able to check for you.
    --
    Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)








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      Prop shaft/axle groaning - where to start 200 1985

      posted by  neilj on  Fri Oct 29 11:35 CST 2004
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      Thanks, the vibration is worse under heavy load or acceleration so u-joints is a good place to start. On that note though, I also have a 940 sedan which has a very distinctive 'clunk' when I engage gear (auto box) - I'm not sure whether it's drive or reverse gears, but otherwise it drives fine - is this 'clunk' similar to your 'clink'?

      Many thanks anyway, I'll take a look underneath...








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        Prop shaft/axle groaning - where to start 200 1985

        posted by  Volvodad on  Sat Oct 30 12:49 CST 2004
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        last visit: Thu Oct 23 16:18 CST 2014
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        I've experienced bad U-jts on everything from my MGB (relatively dainty ones) to the biggest rental truck I could find. Interpreting noises is not an exact science, but the MGB and other cars went "clink" and the truck went "clank". Either way it was a metallic, ringing noise and not the dull thud implied by your description "clunk".
        --
        Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)







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