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Knocking sound goes away when clutch pressed

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  • 23-10-2014 3:20pm
    #1
    Redtop
    Registered Users Posts: 181 ✭✭


    I took a large 10 year old 4x4 for a test drive and everything seemed OK except I heard a knocking or rattle sound when the clutch was not pressed. This was while the jeep was in Neutral and not moving. The noise stopped when the clutch was pressed and all I could hear was the normal hum of the engine. I took my foot off the clutch and she started to knock or rattle again. Is there a clutch or transmission problem lurking ? I'm inclined to walk away.


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    #2
    martinr5232
    Registered Users Posts: 2,298 ✭✭✭martinr5232


    Redtop wrote: »
    I took a large 10 year old 4x4 for a test drive and everything seemed OK except I heard a knocking or rattle sound when the clutch was not pressed. This was while the jeep was in Neutral and not moving. The noise stopped when the clutch was pressed and all I could hear was the normal hum of the engine. I took my foot off the clutch and she started to knock or rattle again. Is there a clutch or transmission problem lurking ? I'm inclined to walk away.

    Depends what make and model but it sounds like dual mass flywheel is knackered.


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    #3
    Redtop
    Registered Users Posts: 181 ✭✭Redtop


    2004 Nissan Patrol


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    #4
    martinr5232
    Registered Users Posts: 2,298 ✭✭✭martinr5232


    Redtop wrote: »
    2004 Nissan Patrol

    Im not sure if they have a dmf or not either way if its not that its in the gearbox most likely. Ring a dealer and ask for a price on a dmf and clutch kit.


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    #5
    gctest50
    Registered Users Posts: 9,605 ✭✭✭gctest50


    tiny chance it could be the thrust washers in the engine block

    the crank and block could be scrap because of this-depends

    tiny chance but get it checked out


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    #6
    Cheensbo
    Registered Users Posts: 2,701 ✭✭✭Cheensbo


    Could be just a release bearing on the input shaft rattling about, far from ideal but not a major major worry, lots of my old wagons have had small rattles that went away when the clutch was depressed, depends on how loud of a noise you're talking about really...

    To replace its almost advisable to do a full clutch kit replacement while its split.. if that's what it is..


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