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Thread: M20 timing troubles

  1. #1
    Join Date
    Jun 2018
    Location
    Alabama
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    7
    My Cars
    1987 Bmw 325i

    Question M20 timing troubles

    Well let me say I am a total beginner. I just got my 1987 325i E30 a few weeks ago and I had no idea when the timing belt had last been changed. So I decided to do it myself I did the job fairly easily taking my time took about 5 and half hours again I am a beginner, but when I started the car it had a grinding noise from 1000 rpms to 1500rpms. This grinding noise isn't at any other rpm that I can hear. So any info on what that could be would be amazing thanks.

  2. #2
    Join Date
    Sep 2014
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    e24e30e36e39e90
    Is that while you're sitting still revving the motor?

  3. #3
    Join Date
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    Quote Originally Posted by sienayr View Post
    Is that while you're sitting still revving the motor?
    It happens both sitting still reving motor or driving at low speeds

  4. #4
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    Could this happen if the timing belt is loose I have the car back apart only took 45 mins this time lol

  5. #5
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    check your TDC marks to make sure everything is aligned properly. Easy to get one tooth off, although I don't know if that creates grinding noises or not. Try to figure out where the noise is from, a length of hose held to your ear while you probe areas of the motor can help locate the exact source of sounds. Like a stethoscope. They sell mechanic's stethoscopes at Harbor Freight as well.

  6. #6
    Join Date
    Jun 2018
    Location
    Alabama
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    Thank you for the help turns out the belt was just loose

  7. #7
    Join Date
    Dec 2012
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    Grandview, MO
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    1989 Bmw325IC
    Which belt?

  8. #8
    Join Date
    Jun 2018
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    Alabama
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    1987 Bmw 325i
    Timing belt

  9. #9
    Join Date
    Apr 2015
    Location
    Toronto
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    e30s
    I would recheck your timing marks..a loose belt could easily jump a few teeth.. If the belt does that rest assured you have bent valves.

  10. #10
    Join Date
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    87 Cabrio & 87 ETA
    If a new belt is loose it's almost certainly because it wasn't properly tensioned and/or the tensioner wasn't tightened down (my money is on this).if so, as ceeker says, you may have done some damage.
    87 Zinno Cabrio 98k Barn Find. Build thread http://www.r3vlimited.com/board/showthread.php?t=268987
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