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Thread: Need BF.C's collective help on my rattle issue

  1. #126
    Join Date
    Feb 2012
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    Birmingham, Alabama, USA
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    8,369
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    1995 BMW M3
    Quote Originally Posted by jakermac View Post
    I don't mean to demean anything being said here, just relate my own experience. My cam to cam chain was a brand new Iwis chain when I built the engine. The noise was present from the 1st start-up.
    Yup. I replaced all that stuff in my old engine. Didn't fix it...

  2. #127
    Join Date
    Aug 2008
    Location
    Calgary, Ab
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    176
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    E30
    Quote Originally Posted by NOTORIOUS VR View Post
    Well this is encouraging!

    Can I ask which chain you're speaking of? I'm assuming just the chain between the cams and not the one from the crank since that would require removal of the head to get the front cover off.

    I might just bite the bullet and order up these parts as well.
    Yes just the cam to cam chain. I installed a new main timing chain and guides when I built the motor.

  3. #128
    Join Date
    Oct 2006
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    Toronto, Canada
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    3,375
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    E36 Turbo
    ah alright, I did all the chains and lower guides when I built my motor as well.

    I'm happy that you were able to solve the issue. Were you able to see any order of abnormal wear on the parts you changed out that might have caused the noise?

  4. #129
    Join Date
    Sep 2002
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    USA
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    FWIW I did all IWIS master-less chains w/ new guides/tensioners/etc. on my engine when I built it. I think the only thing I didn't replace was the sprockets. I did put on a new crank sprocket, though.

  5. #130
    Join Date
    Oct 2010
    Location
    Manchester, N.H.
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    16,712
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    96 332IS 6466 turbo
    Quote Originally Posted by 5mall5nail5 View Post
    FWIW I did all IWIS master-less chains w/ new guides/tensioners/etc. on my engine when I built it. I think the only thing I didn't replace was the sprockets. I did put on a new crank sprocket, though.
    When you got the new crank sprocket, did it reference (front/rear)?
    I found out the hard way on front and rear of that sprocket. Very tough to tell, only small recess. Get it wrong, chain won't fit.
    1996 332IS
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    Technique Tuning 80# tune.
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    Your 1 and only stop for all your BMW performance needs
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  6. #131
    Join Date
    Aug 2008
    Location
    Calgary, Ab
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    176
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    E30
    Quote Originally Posted by NOTORIOUS VR View Post
    ah alright, I did all the chains and lower guides when I built my motor as well.

    I'm happy that you were able to solve the issue. Were you able to see any order of abnormal wear on the parts you changed out that might have caused the noise?

    Nothing I could see just by looking at them or putting them together to compare. Teeth were not pointy, sharp or worn badly. There was some wear on the thrust washers from the spring plate but that's normal from what I've seen. Nothing really stood out that would make me say it was the cause of the problem. I was surprised when I fired it up and the noise was gone, I honestly figured I spent a bunch of money for nothing.

  7. #132
    Join Date
    Sep 2002
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    USA
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    Quote Originally Posted by Butters Stoch View Post
    When you got the new crank sprocket, did it reference (front/rear)?
    I found out the hard way on front and rear of that sprocket. Very tough to tell, only small recess. Get it wrong, chain won't fit.
    I don't remember off hand but it fit fine and the chain lines up fine. Just a rattle, only when the car is warmed up, at light throttle around 3000 RPM. Going more than 5% throttle or 0% throttle makes it go away. I'll tear the engine down some day to check it out.

  8. #133
    Join Date
    Nov 2011
    Location
    Gaithersburg, MD
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    17
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    86 528e B35/5spd Swap
    Bringing this thread up.
    Did anyone successfully diagnosed this 3k low load rpm falling rattle noise?

  9. #134
    Join Date
    Oct 2006
    Location
    Toronto, Canada
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    E36 Turbo
    Quote Originally Posted by smhheidari View Post
    Bringing this thread up.
    Did anyone successfully diagnosed this 3k low load rpm falling rattle noise?
    Nope... still there... still annoying and shitty sounding

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