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Thread: Strange rattle sound coming from transfercase/gearbox area

  1. #1
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    Strange rattle sound coming from transfercase/gearbox area

    Hi every one.

    I just picked up my 6x6 97 perentie a few days ago, real beast of a machine it is, how ever, I have a mechanical grimlin already, on the drive home I started to hear a rattle sound, at first I thought that was normal, I thought no more of it and continued driving, it wasn't until a few days later when I took her for a spin it got really bad, at around 40-60kph the rattling sound becomes almost as loud as the engine! this wasn't happening when I first test drove it, so today I got under her, checked the transfer gearbox, yep got heaps and heaps of oil, seems clean too, checked the drive shafts they seemed secured in, bolts all look tight, ill try and upload an audio clip of this at of some point, bit bumed out was looking forward to taking her for a long drive, could any one give me some insight in what this could be? it sounds similar to the sound when you release the clutch pedal in neutral, but doesn't go away.
    the previous owner was meticulous in caring for it, sadly he passed away.

    thanks in advanced.

  2. #2
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    You could try tightening all the gearbox mounts. Mine became loose and resulted in a terrible grinding noise.
    L322 tdv8 poverty pack - wow
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    Thinking outside the square a bit - problem with exhaust? (loose baffle in muffler, exhaust pipe hitting part of chassis, exhaust leak etc). Faulty exhausts can often make sounds you wouldn't normally expect. The sound can also travel anywhere along the pipe making it sound like it was coming from somewhere it isn't.

    Edward

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    Quote Originally Posted by I Love My Landy! View Post
    Thinking outside the square a bit - problem with exhaust? (loose baffle in muffler, exhaust pipe hitting part of chassis, exhaust leak etc). Faulty exhausts can often make sounds you wouldn't normally expect. The sound can also travel anywhere along the pipe making it sound like it was coming from somewhere it isn't.

    Edward
    I had this exact fault a couple of weeks ago it drove me nuts trying to find it. The rattle would only happen in a certain rev range so long story short the muffler completely failed one morning I purchased a second hand one from gumtree and no more rattle.

  5. #5
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    Thanks all for the input.. Well we found out the culprit, the u bolt joiners on the drive shaft had greese nipples, they where near dry! had them all filled up, and now the noise is mostly gone, its still present but at much lower volume.. I did see how ever at the transbrake on the rear I noticed oil slightly seeping out from the centre and spreading slightly, would this be some thing to be concerned about?

  6. #6
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    Good to hear you found the problem Manuel!
    Regarding your oil leak, it seems like you may have a leaking transfer case output shaft seal. The rear prop shaft & brake housing need to be removed to replace the seal. I'm sure I have used a double lip seal made by corteco. There should also be a felt washer or possibly a heap of silastic on the splines of the output shaft which prevents oil migration along the spline. The leak could be coming from there too. If the leak is bad enough it will get into your handbrake drum & contaminate the brake shoes. I don't think it's a major issue, but I wouldn't be putting too much confidence on the effectiveness of your handbrake.
    Edward

  7. #7
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    cheers, thanks for the info, I think ill be replacing the gearbox/transfer case as the sycnchros are slightly worn, I have a new spare gearbox transfer case, so ill be chucking that instead in the near future.

  8. #8
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    Quote Originally Posted by manuel View Post
    Thanks all for the input.. Well we found out the culprit, the u bolt joiners on the drive shaft had greese nipples, they where near dry! had them all filled up, and now the noise is mostly gone, would this be some thing to be concerned about?
    not to be subtle.

    Change them
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  9. #9
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    Quote Originally Posted by Blknight.aus View Post
    not to be subtle. Change them
    how come? why do they need to be changed?

  10. #10
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    Quote Originally Posted by manuel View Post
    how come? why do they need to be changed?
    As a general rule, Anything on these vehicles with a grease nipple has a bearing in it, if its been squeaking its been run dry and is now worn.

    Bearing failure on pretty much any part of a landrover driveline generally result in posts that have key words such as..

    Entertaining, Expensive and occasionally, Fatality.


    prop007_ims_2_-min.jpg

    Thats whats known as a prop shaft with a double carden joint. one end of it has a single universal joint and the other has a double carden.

    there should be 5 locations that need to be greased on it.

    1. the universal joint
    2. the slip joint
    3. the first uni of the double carden
    4 the centralising bearing inside the double carden2
    5. the second uni of the double carden.

    Grease nipples for Ujs can be found in 3 general position In the center of the yoke, on its side or in one of the bearing cups.

    the propshaft turn relatively quickly and has a fair whack of mass about it, if it runs unbalanced or on a clapped out uni eventually it will take out either the bearing thats supporting and end of it or itself will fail.

    for further reading

    Prop Shaft U-joint or, you can get lucky!

    Disco II driveshaft rebuild - Land Rover Forums - Land Rover Enthusiast Forum

    the latter is not from this forum. but...

    the zf auto is $4-6k to replace if you damage your casing.

    the 6x6 lt95.... I've been quoted upto $11k. (keep in mind the lt95 is an all in one casing, if you break the main body of it you have to replace all of it, if you only damage say an output housing you can replace just that and its assosciated bits)
    Attached Images Attached Images
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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