BMW diesel belt tensioner
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Thread: BMW diesel belt tensioner

  1. #1
    Join Date
    December 1st, 2005
    Yorkshire UK

    BMW diesel belt tensioner

    Steering became heavy, I thought the power system was failing, then I noticed the ign light on, followed by clattering noises from the engine, popped the hood & noticed the serpentine belt was loose, the small hydraulic belt tensioner wasn't pushing the wheel on the crank, got the jack handle from the boot & sort of 'jemmied' it & it went 'bang' & was working again, all back to normal.
    I read somewhere that these little hyd cylinders must be kept upright or they get an airlock, so my question is, can they loose oil? mines dry, no apparent leak, can they be topped up? what makes them stick, & can they be 'unstuck, this same thing happened about 6 months ago, so it may be getting worse.
    Any diesel owners had similar?
    '96 2.5 DSE Manual, red/lightstone

    Maybe one day I'll grow up!!

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  3. #2
    Join Date
    April 10th, 2006
    Seascale UK
    never had it happen to me but I think I would be playing safe and replacing it
    99 2.5 DT 127K (UK miles) still on air

  4. #3
    Premium Member
    Join Date
    January 21st, 2006
    UK,South West
    It could be the arm seizing on the shaft - seen this a few times,and had a job to get them apart.Relieve the high spots with a file and reassemble with a small amount of grease.
    Think beyond -

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