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Thread: Chain rattle after oil change

  1. #1
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    Default Chain rattle after oil change

    Guys

    Ever since I bought my Z in 2009, it seems that everytime I do an oil change the car will be noisy for the first week or so afterwards. By noisy I mean I can hear the chain rattle at idle and when I let off the throttle. I originally thought it was the chain and replaced it - about two years ago - but it didn't really change anything. I'm going to take the front cover off in the future to replace it, but I wondering if anyone has any ideas of what this could be and why it does it after oil changed.

    Thanks
    Jan
    1976 280Z
    HLS30288273

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    How long is it noisy? Is it noisy only on the first start up or for several start ups? More details?
    C

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    Patcon

    Its noise for the first few minutes after start up - I would say about 10 minutes tops. It will do it for a week or two, as in be noisy, and then stop completely as if nothing ever happened.

    Jan
    1976 280Z
    HLS30288273

  4. #4
    Registered User madkaw's Avatar
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    What's your oil pressure do in those first few minutes?
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Seems to be above 0 on the gauge. Haven't check with a mechanical guage
    1976 280Z
    HLS30288273

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    I had ideas for a once only noise. For something like you have, I don't know. Dirty oil pump pick up. Air in the oil galleys??? I don't know any one else have ideas?
    C

  7. #7
    Registered User madkaw's Avatar
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    My only thought was a cavitated oil pump after oil changes.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  8. #8
    Walmart greeter Mikes Z car's Avatar
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    my WAG (wild ass guess) sticking tensioner piston (replace tensioner?), bypass valve sticking open slightly temporarily...

  9. #9
    Z geek at large FastWoman's Avatar
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    I was wondering about a sticking tensioner too.
    My last three sports cars while I still owned all three:

    2001 BMW Z3 Roadster 3.0i soft/hard top (sold)
    1966 Ford Mustang Coupe (sold)
    1978 Datsun 280Z (enjoying very much )

  10. #10
    Supporting Member Diseazd's Avatar
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    What kind of damper bolt and washer is in your damper? I used one of the Nismo damper bolt sets with the drop down washer once with a stock damper. When you torqued it up, it set down in the damper against the nose of the crank without really snugging up the crank pulley, worm gear and oil slinger. If the washer you're using isn't flat (as in one plane), this could be your problem. It results in chain noise and will drive you crazy trying to figure out where it came from.
    Last edited by Diseazd; 08-20-2013 at 11:10 AM.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Quote Originally Posted by Pomorza View Post
    everytime I do an oil change the car will be noisy for the first week or so afterwards.
    This probably happens for the same reason that my car runs smoother and faster, and handles better, after I wash it.

    The engine and car are just happier and show their appreciation by putting out more effort. In your case, it's a rattle of joy, joy at having fresh lubricating and cooling fluid.
    1976 280Z, with some minor modifications

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    Interesting update

    So this is what I've noticed. The said rattle noise occurs during two occasions. It will occur when I first start the car, there will be a bit of a rattle from the top end for a few moments. Then the noise will only occur on decel of the motor, as in, if I rev it to say 3500 and let the throttle go it will rattel at around 1800 rpm.

    Thanks
    Jan
    1976 280Z
    HLS30288273

  13. #13
    Nova Scotia,Canada,Earth Blue's Avatar
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    I fixed two efi cars whose engine compartments rattled at 3500 rpm.... it was the heat shield under the intake plenum.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


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  14. #14
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    Tea Leaf Paradox http://www.crank-scrapers.com/ebay%20ads/ebay_index.htm


    MY WAG

    The new oil is sticking to the crank more then the old oil that is thinner.

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