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Bearing noise? 2.3 L turbo 91' 700

posted by  mrmixer2 on  Fri Mar 9 03:04 CST 2007
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last visit: Thu May 3 13:30 CST 2007
[RELATED]

In the lower end of engine I hear what sounds like a worn bearing. This is not noticeable until engine warms up. Seems to have plenty of power and this noise is less detectable at higher rpms. Should I just ignore this, or do I need to prepare for a complete teardown? Thanks in advance.








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    Bearing noise? 2.3 L turbo 91' 700

    posted by  Will740turbo on  Fri Mar 9 13:15 CST 2007
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    last visit: Wed Oct 22 16:09 CST 2014
    [RELATED]

    Is it an accessory? Usually, accessory bearings seem to get quieter (probably get drowned out actually).

    -Will
    --
    1990 740 Turbo, on its way to stock specs, maybe beyond








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    Bearing noise? 2.3 L turbo 91' 700

    posted by  someone claiming to be fixit2003 on  Fri Mar 9 08:16 CST 2007 [RELATED]

    From my limited experience w/ bad bearings it seems that the noise increase with engine rpm. You can sometimes isolate bad connecting rod bearings by carefully disconnecting the spark plugs one at a time while idleing. If loss of one particular plug causes the noise to go away then that con rod bearing is probably bad. My '88 has had a "rod bearing" like noise for the past 50K miles!! Could be a little excess crank end play but it doesn't seem to be geting that much worse with time. Check if your crank pulley isn't coming apart.







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