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Thread: Chain noise

  1. #1
    Junior Member
    Join Date:  Jan 2019

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    Chain noise

    Hi all

    Sorry another query. Iím noticing the main belt for the water pump etc sounds like if has chain noise. The noise is loudest around the bottom pulley. It very consistent and doesnít sound like anything is grinding. Itís a brand new water pump so canít it. Is this normal or potentially a bearing?

  2. #2
    Senior Member
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    Location:  Virginia

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    Quote Originally Posted by Jonty View Post
    Hi all

    Sorry another query. Iím noticing the main belt for the water pump etc sounds like if has chain noise. The noise is loudest around the bottom pulley. It very consistent and doesnít sound like anything is grinding. Itís a brand new water pump so canít it. Is this normal or potentially a bearing?
    Perhaps youíre hearing the timing chain?

  3. #3
    Junior Member
    Join Date:  Jan 2019

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    Quote Originally Posted by CFI View Post
    Perhaps youíre hearing the timing chain?
    Potentially I am but its very noticable (can easily hear it from the front of the car). When I have heard loose timing chains befroe those it is more of a rattle than a consistent sound of a chain. Shoudl I hear the Delorean timing chain?

  4. #4
    Senior Member
    Join Date:  Nov 2014

    Location:  Alexandria, VA

    Posts:    196

    Are you sure it's not your v-belt slipping? what does your voltage with the engine running look like?

  5. #5
    Delorean Guru
    Join Date:  May 2011

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    Possible it is one of the idler pulley bearings.
    David Teitelbaum

  6. #6
    Junior Member
    Join Date:  Jan 2019

    Posts:    25

    Thanks voltage is fine. What Iíll do is see if my local mechanic can have a listen to see if itís a familiar sound before I pull anything apart

  7. #7
    Senior Member
    Join Date:  Dec 2016

    Posts:    247

    You might try locating the source by elimination. Take off the belt driving the water pump and generator. Briefly run the engine to see if the noise changes. Obviously, you do not want to run the engine more than 30 seconds; just long enough to see what the noise does. You could also do a test with the belt driving the AC compressor removed. Seems doubtful that this would be the cause but you never know, there are a couple of idler pulleys on that belt.

    Ron

  8. #8
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    Location:  Crystal Lake IL

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    Just lift the A/C belt off the top pulley and spin the pulley. Very quick noise test. Obviously doesn't test the bottom one, but they tend to wear out at the same time. OR just remove the belt. I've heard pulley bearings that get as loud as the engine.
    Dave S
    DMC Midwest - retired but helping
    dswingle@DeLorean.com

  9. #9
    Junior Member
    Join Date:  Jan 2019

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    Last edited by Jonty; 04-10-2019 at 04:27 PM.

  10. #10
    Junior Member
    Join Date:  Jan 2019

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    Quote Originally Posted by DMCMW Dave View Post
    Just lift the A/C belt off the top pulley and spin the pulley. Very quick noise test. Obviously doesn't test the bottom one, but they tend to wear out at the same time. OR just remove the belt. I've heard pulley bearings that get as loud as the engine.
    Thanks - I actually don't have an AC belt on at present.

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