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Thread: Bumping noise

  1. #1
    Z Slave 1 Bravo 6's Avatar
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    Default Bumping noise



    CRIPES !!! but it's frustrating.

    My '74 260 Z has developed a bumping, thumping noise which appears to be in the area of the rear right suspension.

    I've pushed, pulled, twisted and shoved at everything I can lay hands on.

    My mechanic had the car up on the hoist today after I'd driven him around, trying to pin point the noise and he couldn't locate the problem either.

    Any suggestions ??????

    Rick.
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    Default

    Is the bumping noise constant or only when you do something in particular? It doesn't happen just at night does it? Cause then it would be something that goes bump in the night.
    Victor.

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    Default I betcha anything the sound u are hearing is what i Had

    this past summer. Is it in the shock area? Do you hear it when you go over any slight bump? It might be the same problem i had: a loose gland nut on your strut. Remedy: Jack up the car ever so slightly until the tire is just off the ground. then look through the spring and you should see where the gland nut screws into the housing. you will prob have to lift up the strut boot. Get Channel Lock pliers and grab the nut, it'll be hard to do and you may have to adjust the jack to get to it. turn and tighten as much as you can and you should be good to go.
    1978 280z A/T, No. HLS30-457084, purchased 11/2002
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    Default Many thanks

    cnixgo,

    Thanks for that mate.

    I recently had all the shock absorbers replaced so there's a good chance you might be right.

    I've printed out your suggestion and will take it to my mechanic on Thursday.

    OH, Tanny, Tanny, Tanny.


    I should have known that you would come up with such a logical answer to my problem.

    Thanks mate.

    Rick.
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    Default

    hey hey,

    let us know if that took care of the noise, i've been having similar problem lately, in my rear left...

    thanx.

    slav.

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    Default Oh, POOP !!!!!

    No, slav, I still haven't found the problem.

    Had the suspension pulled down a couple of times since but the damned "Bump" is STILL there.

    Talk about frustration.

    Rick.
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    Might be a silly question but what is the condition of your lower bushes?

    Are your drum brakes in good condition? just trying to get an idea here.

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    Default

    if you have camber bushings in the rear swing arm, replace them with urethane bushings. that was the problem with mine(bump noise problems

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    Default

    IF it is a clunk when you shift or step on the gas, it may be your u-joints. I get to replace mine this winter

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    Default Bloody cars



    G'Day Gav,
    Nice try mate but I had "Precious" into Pedders suspension just twelve months ago and had all bushings etc. replaced.
    Brakes are fine.

    No, Hauserdaddy,
    It ain't the U Joints mate.

    Keep the ideas flowing you blokes, I need all thehelp I can get.

    Rick.
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    Red face

    Diff mount?

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    Talking bump

    A roo stuck under your tire?....seriously you never said when it makes the noise....
    Late '71 240Z - It ain't done til it's done!

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    Default Oh, POOP some more.

    G'Day Gav,

    You suggest the diff mount ????? but the noise is Definitely coming from the region of the right rear suspension. Do you think a shot diff mount noise would "TRAVEL" and appear to come from the rear right ???????????????

    Billcap,
    I didn't realise that I had not been more specific till I reread my first post.

    It sounds for all the world like a buggered shock absorber but I've just recently replaced all four.

    When does the noise occur ???

    Every time the rear right tyre hits a good bump.

    Rick.
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    Default

    I'm not sure rick I had a clutch problem for a long time that i thought was a gearbox mount as it happened downgearing and would cause a shudder been told you can't get them anymore I bought a good second hand unit.
    got under the car went to the effort of pulling her out and discovered the one in there was near perfect.

    It could possibly travel have you checked for playing in the driveshaft there bolted on tight arn't they?

    You've made sure the top of the struts is tight at the shock tower also?
    I've never replaced a set of struts myself so i don't know if you can muck anything up yet .

    have you jacked the car up and tried for play with the wheel it self does it stay firm if u try move it side to side. If there was any way you could recreate the noise I think it might help i'm all outta ideas but.

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    Default Bloody noises



    G'Day again Gav,

    Mate, I've watched the mechanic trying to wobble the wheel, use a long screw driver to try levering various parts and I've even taken her back to Pedders and asked them to put the car on their shock absorber tester but STILL can't find where the bloody noise is coming from.

    I'll have a close look at the rear gear box mount.

    Talk about frustration. I'd be tearing my hair out if I wasn't so concious of my ever enlarging bald spot.

    Thanks to EVERYONE for your input.

    Oh, yes,-----to add insult to injury, the battery kept losing charge. After testing the battery and finding it o.k. I checked out the regulator. OOOOHHHH, what a mess !!!!!! CORROSION !!! oh well, there goes another original part.

    Rick.
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    it's not the screw holding down the spare tyre is it?
    What about the hatch is she firmly on?

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    Default Keep tryin' Gav,



    No, mate, I thought of that. Removed the spare and tools, took her out and the noise was still there.
    I've crawled into the rear on my back and pushed and shoved the hatch with out luck. (No mean feat when you're 60 going on 25 and have a ****y back).

    I'm just about at my wits end on this one. It's got me STUMPED.

    Rick.

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    Default

    Have you ever had the gas tank out? Since you've eliminated most everything else, could it be the tank straps are loose? Or, if the tank was out, were the small pads on the top of the tank OK?
    Perhaps the cushion pads have detiorated and the tank is moving inside the tank straps?

    Only other things I can think of is the exhaust hitting the diff crossmember or the diff itself and it only sounds like it's coming from the other side by transferring through the chassis....

    One other off the wall idea... the mounting bolt on the bumper end?

    Guess the frustrated smilie would be a combination of these.........
    "If it weren't for fools, the rest of us could not succeed." Mark Twain.

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    Default

    In a Z that I owned a few years back, I had a noise that occured when I drove over a rough railroad crossing. I would hear a kind of "Thump and Rattle" that turned out to be the spring-type support hanger for the right-side Hand brake cable (from the "U-shaped bracket to the right rear brake assembly) being a bit stretched out and allowing the cable to hit other parts of the car when the suspension was compressed on that side of the car.

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    Default Frustration reigns supreme

    Yes Keith, would certainly be in any combination depicting frustration.

    Mate, I have had the tank out but it's well secured by the straps.
    Gavin suggested the diff mount and that appears to be o.k.
    Bumper mounting bolts are tight and the exhaust system checks out o.k.

    Carl, that's something I haven't checked out. Didn't occur to me.
    I'll have a gander at it and get back to you tomorrow.

    Fingers crossed.

    Rick.
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    Default

    Did Rick ever find the cause of the rattle? I have the exact same noise going over bumps. There is a metalic thump followed by rattling coming from the right rear strut tower. The noise started after I installed Arizon Z springs with Tokico HP shocks. I did the exact same suspension on my V8 240Z and have had no problems for three years.


    Miles

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    Did Rick ever find the cause of the rattle? I have the exact same noise going over bumps. There is a metalic thump followed by rattling coming from the right rear strut tower. The noise started after I installed Arizona Z springs with Tokico HP shocks. I did the exact same suspension on my V8 240Z and have had no problems for three years.


    Miles

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    I know this is an old post, but it just kind of "ended". I have a very similar sounding problem in my 77. If I hit a sharp bump like a pothole or the lip of a drive way or something like that it makes a terrible thump and then a kind of resonate rattle. It sounds like something is contacting the body but after searching and searching I can't figure out what. With the car on a lift I can't move any of the suspension parts with a prybar and there are new urathane mustache bar bushings installed. Did 1 bravo 6 have any luck? Anyone ever heard of a front diff mount making noise over bumps? I can't move it by hand but I know that doesn't mean its not broke. Also, I've checked the exhaust and the rear hatch both seem to be O.K.

    Again, sorry for dragging up ancient history but any help would be highly appreciated.

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    Default

    IIRC Rick's noise turned out to be in his sunroof frame.

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    Yair,

    What Garth said.

    And didn't I feel like a bloody fool when Barb reached up and pushed on the sunroof and the damn noise STOPPED !!!!!!

    That was after I'd had three mechanics check out the right rear suspension, replaced the shocks all round, rear wheel bearings and seals, UJ's on the half shafts and the diff mount.

    One consolation, .... at least I know the rear suspension is o.k.

    Dum de Dum Dum DUUUUUM.

    Rick.
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    Default

    thanks for answering my question guys, but my 280 (this one anyway) doesn't have a sunroof. oh well, I'm glad you got yours figured out at least. If you have any suggestions that you didn't mention already I'd be happy to hear them. Thanks again.

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    could it be as simple as a strut bumper? mine were pretty badly beaten up last time I did struts..

    maybe its not suspension related? is your exhaust well strapped?
    Quote Originally Posted by 1 Bravo 6
    G'Day Gav,

    You suggest the diff mount ????? but the noise is Definitely coming from the region of the right rear suspension. Do you think a shot diff mount noise would "TRAVEL" and appear to come from the rear right ???????????????

    Billcap,
    I didn't realise that I had not been more specific till I reread my first post.

    It sounds for all the world like a buggered shock absorber but I've just recently replaced all four.

    When does the noise occur ???

    Every time the rear right tyre hits a good bump.

    Rick.
    NOT Empty Anymore...

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    oops nevermind...didnt read all the way down the page..

    Quote Originally Posted by 1 Bravo 6
    Yair,

    What Garth said.

    And didn't I feel like a bloody fool when Barb reached up and pushed on the sunroof and the damn noise STOPPED !!!!!!

    That was after I'd had three mechanics check out the right rear suspension, replaced the shocks all round, rear wheel bearings and seals, UJ's on the half shafts and the diff mount.

    One consolation, .... at least I know the rear suspension is o.k.

    Dum de Dum Dum DUUUUUM.

    Rick.
    NOT Empty Anymore...

  29. #29
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    Hi Billy, before I rebuilt the suspension on my '73, it would darn near rattle the teeth out of my head when I hit a pot hole or any bump on the road. It sounded like the struts were bottoming out, there was a metal to metal "clank" sound. The struts were shot, and the bump stops were missing on all 4 struts. Most of the original bushings were intact, with the exception of a couple on one of the rear transverse links.

    I also had a rear end "clunk" that I never could pinpoint, but it was gone after the suspension rebuild, too. In addition to new struts, springs, and urethane bushings, I also replaced the engine mounts, transmission mount and rear differential mount.
    Kenny P.

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    Hello Ken

    Are you please able to elaborate some more on what you are referring to when you mention bump stops on the suspension?

    Thanks

    Joseph
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    Quote Originally Posted by 240 in OZ
    Hello Ken

    Are you please able to elaborate some more on what you are referring to when you mention bump stops on the suspension?

    Thanks

    Joseph

    The "bumps stops" or rubber bumpers are part of the strut assembly and mount on the piston rod inside the coil pack. The bump stops prevent the strut assembly from bottoming out on the upper spring seat during severe compression. See #4 the image linked below for a visual.

    Rear Suspension - Bump stop

    I just purchased a set of KYB strut boots that have a bump stop built into the boot. I prefer these to the harder durathane bump stop that came with my Energy Suspension bushing kit.

    KYB strut boot
    .
    .
    .
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    Quote Originally Posted by billyjarrell
    I know this is an old post, but it just kind of "ended". I have a very similar sounding problem in my 77. If I hit a sharp bump like a pothole or the lip of a drive way or something like that it makes a terrible thump and then a kind of resonate rattle. It sounds like something is contacting the body but after searching and searching I can't figure out what. With the car on a lift I can't move any of the suspension parts with a prybar and there are new urathane mustache bar bushings installed. Did 1 bravo 6 have any luck? Anyone ever heard of a front diff mount making noise over bumps? I can't move it by hand but I know that doesn't mean its not broke. Also, I've checked the exhaust and the rear hatch both seem to be O.K.

    Again, sorry for dragging up ancient history but any help would be highly appreciated.
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    hey thanks guys, I was checking the car over again yesterday and after pulling the dust covers up on the struts ( to check the gland nut ) i found that the left rear was leaking badly. I sure hope this does it, anyway KYB's on the way.

  34. #34
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    Hi guys, I had the same type of noise when I would drive over inclines or declines on driveways or parking lots. I put in new mounting insulators when I replaced the struts in front and the noise disappeared. The noise would occur when the weight was off the front end.

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    Quote Originally Posted by billyjarrell
    hey thanks guys, I was checking the car over again yesterday and after pulling the dust covers up on the struts ( to check the gland nut ) i found that the left rear was leaking badly. I sure hope this does it, anyway KYB's on the way.
    I'd say it's definately your suspension bottoming out and that's where the banging noise is coming from, I had a similar problem with my old Koni's they were shot. I installed Tokico 5 way's and I don't have the problem anymore.

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    Quote Originally Posted by beandip
    HAVE YOU EVER THOUGHT OF STARTING A NEW THREAD??? WHATSA MATTA FOR YOU ??
    There goes beandip yelling again. Must be the viagra.
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