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bmw 320d crankshaft pulley

  • 14-08-2012 5:56pm
    #1
    gives a bite baby
    Closed Accounts Posts: 30 ✭


    well lads. i have a 2004 bmw 320d 150 bhp . there is a terrible squealing/squeaking coming from the front of the engine ie. where the pulleys are. its very hard to hear exactly which pulley its coming from. it happens between 1000 to 2000 rpm.
    i have changed the tension pulley and rollers as initialy taught it was coming from them . i am now convinced the noise is coming from the crankshaft pulley .
    so first question is it possible for this noise to come from this pulley?.

    if so any tips with removing it ?
    is buying second hand a bad idea with this ?.


    thanks


Comments

  • #2
    AzureAuto
    Banned (with Prison Access) Posts: 233 ✭✭AzureAuto


    I doubt it would be the crankshaft pulley, what is the condition of the drivebelts like theesleves, i.e. are they worn/shiny/torn?


  • #3
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    gives a bite baby wrote: »
    well lads. i have a 2004 bmw 320d 150 bhp . there is a terrible squealing/squeaking coming from the front of the engine ie. where the pulleys are. its very hard to hear exactly which pulley its coming from. it happens between 1000 to 2000 rpm.
    i have changed the tension pulley and rollers as initialy taught it was coming from them . i am now convinced the noise is coming from the crankshaft pulley .
    so first question is it possible for this noise to come from this pulley?.

    if so any tips with removing it ?
    is buying second hand a bad idea with this ?.


    thanks

    The crank pulley is fixed to the crank, It can't cause a squeak. It will likely be either the belt worn and slipping or one of the other pulleys/tensioner etc

    When you remove the plastic engine covers, is there any oil leaks visible? Its common enough for oil leaks from the chain cover or rocker covers to leak onto the belt and cause it to slip.


  • #4
    msg11
    Closed Accounts Posts: 3,572 ✭✭✭msg11


    Just to add, I had a serious squeak coming from my aux belt, changed the belt and inspected everything, all looked fine. Turns out the cam belt pully was on the way out, the rubber inside the part hard started to wear, pretty common in the Evo 4's.

    Anyway the pully came apart last week. Waiting on a new part to arrive so if the squeak is gone I will know it was that causing it, which it more than likly was.


  • #5
    Wheelnut
    Registered Users, Registered Users 2 Posts: 977 ✭✭✭Wheelnut


    Nissan doctor wrote: »
    The crank pulley is fixed to the crank, It can't cause a squeak...

    Do these not have a "damped" pulley? Not sure if that is the correct name, I mean a pulley in which the hub and rim are two separate parts bonded to a rubber section between them.

    The bonding can fail in this type of pulley and cause a squeeling noise when the two parts slip over each other. However if this is the problem there would be little or no drive to the belt so the water pump would not pump, the alternator would not charge and the steering would be heavy.


  • #6
    ShiresV2
    Closed Accounts Posts: 190 ✭✭ShiresV2


    A handy way to locate noises in the engine bay is to cut a metre long length of garden hose or similar. Put one end to your ear and move the other end around looking to locate the noise. Works for me, last used on Saturday to locate a vacuum leak on my Volvo.


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  • #7
    gives a bite baby
    Closed Accounts Posts: 30 ✭gives a bite baby


    i have new belts already.. i had the car with a mechanic before and he told me that the crankshaft pulley needs to be replaced as theres a crack in it.
    i Will try the trick with the hose to see can i pin point .


  • #8
    martyc5674
    Registered Users, Registered Users 2 Posts: 2,522 ✭✭✭martyc5674


    gives a bite baby wrote: »
    i have new belts already.. i had the car with a mechanic before and he told me that the crankshaft pulley needs to be replaced as theres a crack in it.
    i Will try the trick with the hose to see can i pin point .

    Easiest thing you could do is pop off the belt... Start it and see if the noise goes away.
    It could be crank pulley... There's weights in these(harmonic balancers) but they usually make a clattering noise not a squealing noise.

    If it's still squealing with belt off I'd be looking under cam covers ASAP.

    Could be a altenator bearing etc too... With belt off see if these run freely.
    Marty.


  • #9
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    Wheelnut wrote: »
    Do these not have a "damped" pulley? Not sure if that is the correct name, I mean a pulley in which the hub and rim are two separate parts bonded to a rubber section between them.

    The bonding can fail in this type of pulley and cause a squeeling noise when the two parts slip over each other. However if this is the problem there would be little or no drive to the belt so the water pump would not pump, the alternator would not charge and the steering would be heavy.

    They do but if the rubber damper failed the pully would come apart.


  • #10
    martyc5674
    Registered Users, Registered Users 2 Posts: 2,522 ✭✭✭martyc5674


    When they go on the jtd engines they don't necessarily fall apart... (only engine I've experienced trouble with these)
    The rubber fatigues and can cause all sorts of clattering noises particularly when under load(full lock steering/alternator working hard)
    If the rubber goes altogether it will still drive the belt as it's really only a cush drive.. Metal just meets metal if the rubber goes.
    But it could throw your belt as it ain't going to be stable/concentric.

    To look at them they look perfect but the rubber is stretching and compressing more than it should with each pulse from the engine.
    If it is doing this and you can look directly side on at your tensioner it will be bobbing up and down considerably as the belt will be getting tugged at essentially by the pulley as it overtravels back and forward.
    Marty.


  • #11
    gives a bite baby
    Closed Accounts Posts: 30 ✭gives a bite baby


    martyc5674 wrote: »
    gives a bite baby wrote: »
    i have new belts already.. i had the car with a mechanic before and he told me that the crankshaft pulley needs to be replaced as theres a crack in it.
    i Will try the trick with the hose to see can i pin point .

    Easiest thing you could do is pop off the belt... Start it and see if the noise goes away.
    It could be crank pulley... There's weights in these(harmonic balancers) but they usually make a clattering noise not a squealing noise.

    If it's still squealing with belt off I'd be looking under cam covers ASAP.

    Could be a altenator bearing etc too... With belt off see if these run freely.
    Marty.

    Is it o.k to start it with the belts off ? It does say on the front off the pulley not to .?


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  • #12
    martyc5674
    Registered Users, Registered Users 2 Posts: 2,522 ✭✭✭martyc5674


    gives a bite baby wrote: »
    martyc5674 wrote: »
    gives a bite baby wrote: »
    i have new belts already.. i had the car with a mechanic before and he told me that the crankshaft pulley needs to be replaced as theres a crack in it.
    i Will try the trick with the hose to see can i pin point .

    Easiest thing you could do is pop off the belt... Start it and see if the noise goes away.
    It could be crank pulley... There's weights in these(harmonic balancers) but they usually make a clattering noise not a squealing noise.

    If it's still squealing with belt off I'd be looking under cam covers ASAP.

    Could be a altenator bearing etc too... With belt off see if these run freely.
    Marty.

    Is it o.k to start it with the belts off ? It does say on the front off the pulley not to .?

    If it's driving an oil pump or a water pump then don't.
    Someone who knows this engine like ND will advise.
    Marty.


  • #13
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    gives a bite baby wrote: »
    Is it o.k to start it with the belts off ? It does say on the front off the pulley not to .?


    The oil pump is driven by the timing chain. The water pump is driven by the belt you'd be removing but, if the engine is cold then you could run it for maybe 30 seconds or so(and likely a bit more) without issue, that should be long enough to confirm if the noise is gone or not.


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