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Thread: 92 E34 M20 Help - Wont Start

  1. #1
    Join Date
    Dec 2005
    Posts
    7

    Default 92 E34 M20 Help - Wont Start

    Hi Guys,

    I have been having an overheating problem which I was working on, topping up, bleeding, looking for leaks etc etc, anyway..........

    A few days ago, I started the car OK, turned the engine off to close garage, restarted the car and heard strange crunching noises, not metallic, more plasticky.

    Since then the car refuses to start, engine turns OK but seems to be turning faster than normal. Prior to looking for a spark at the plugs, did a compression test, ZERO reading !!.

    I have just taken the camshaft cover off to investigate further, and I find small bits of plastic in a recess under the leftmost camshaft (looking from the front).

    From checking on the internet I believe that these are remnants of the timing chain guide, turned the engine over quickly and cams, sprockets and chains all turn OK.

    Anyone got any idea if the timing chain guide failure would result in the compression loss which I assume is causing the starting problem, or has something more sinister happened.

    Anyway, for now taking off the water pump etc for a closer look.

    Regards..............

  2. #2
    Join Date
    Dec 2005
    Posts
    7

    Default

    Sorry, M50 not M20

  3. #3
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    if you are lucky the cams are just out of time, but most likely it bent some valves
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  4. #4
    Join Date
    May 2006
    Location
    Antwerp, Belgium
    Posts
    552

    Default

    Quote Originally Posted by winfred
    if you are lucky the cams are just out of time, but most likely it bent some valves
    And that would explain zero compression and why your engine cranks fast.
    Isn't this supposed NOT happen to an M50?
    2008 audi A3 1.9tdi
    (former 1991 520i LPG)

  5. #5
    Join Date
    Dec 2005
    Posts
    7

    Default

    Does bent valves = new/recon head ????

  6. #6
    Join Date
    Dec 2003
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    baton rouge, loserana
    Posts
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    Default

    not really you could replace the bad valves for a good bit less then a rebuilt head

    Quote Originally Posted by eddie_uk
    Does bent valves = new/recon head ????
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  7. #7
    Join Date
    Dec 2005
    Posts
    7

    Default

    OK thanks for that, if it is bent valves, lets hope there aren't too many

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