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2008 Chrysler Sebring Question: 2008 Sebring 2.4l 67000 miles I'm getting knocking and whirring from engine.

 

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sebring514, Warren, MI, May 01, 2013, 11:39
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I replaced the idler pullies and tensioner also the power steering pump. Had the alternator tested for noise but it's not there. When I take the serpentine belt off and start the motor the noise is all but gone. Could this noise have to do with a worn timing belt? (or tensioner) It sounds like a diesel.

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    pushrod May 01, 2013, 18:36
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     Master

    Think about your question! If you take off the drive belt and the noise changes, then that is most likely the problem area. Timing belt and its componets are not affected! Mechanic needs to take a look. Possible crank pulley/damper or other driven componets.

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    sebring514, May 02, 2013, 06:54
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    On a hunch I replaced the alternator and the noise is gone. Guess you shouldn't trust what the parts store tells you. I think their machine made so much noise it covered the sound. Thanks for your response.

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    pushrod, May 02, 2013, 07:08
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    Glad you got it fixed!

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  • Answer #2

    Stan's Garage (114 Answers) , Dearborn Heights, MI - (313) 915-4196
    Stans Garage May 02, 2013, 05:34
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     Journeyman

    I agree with answer # 1. There is no way it can be inside the timing belt. If you want us to check this out please call 313-562-7022 or schedule an appointment on line at StansGarage.net. I am sure we can diagnose it and give you the answer you need.
    Larry

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    sebring514, May 02, 2013, 06:55
     Rookie

    On a hunch I replaced the alternator and the noise is gone. Guess you shouldn't trust what the parts store tells you. I think their machine made so much noise it covered the sound. Thanks for your response.

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    mrplaser, March 17, 2014, 05:55
     Rookie

    Your hunch was partially correct. The alternator may test as good on the parts store machine because their machine does not put the same amount of tension on the decoupler pulley as there is when it is installed in your car. the alternator itself is/was probably fine. The noise was most likely caused by a bad bearing in the decoupler pulley. They are known to fail and yet so few people, even seasoned mechanics, know of the problem. These decoupler pulleys are replaceable. You can usually find them online for around $45-50, which is a huge difference from the $240-280 you would spend on a new alternator. Maybe the mechanics DO know about this and are charging for a new alternator, but only replacing the pulley for a better profit margin.

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    pushrod, March 17, 2014, 07:17
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    Sorry you feel that way! However not everyone is a crook!!! No indication here that alternator replacement was suggested as a repair! You can replace the decoupler,,,,'IF' that is the problem!!!

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