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Thread: what the hell happened to my motor!?

  1. #1
    Join Date
    Aug 2006
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    Oklahoma
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    Default what the hell happened to my motor!?

    I finally did it. I ordered a bunch of parts, everything from head gaskets to new ford fuel injectors and even a new air boot.

    Took it apart today, it was pretty easy. My first time and it took about 4 hours.

    I expected to find it a mess but I never expected to find damage!










    Last edited by infurno; 11-20-2008 at 01:24 AM.

  2. #2
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    Oklahoma
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    A little bit of background...

    The head was replaced about 2 years ago. It was bought rebuilt.

    The car ran fine without any trouble for about 1 year. Then it started to smoke when starting.

    Would only smoke when starting, not while driving.

    I took the engine apart to make sure the head was ok, and to replace the valve seals. I was certain that was the problem.

  3. #3
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    How's that cylinder wall look? The valve crumb get blown out the exhaust? All you need is a new Valve? That's not bad is it?
    Last edited by Jehu; 11-20-2008 at 01:37 AM.
    1995 540i Manual build 1/95

  4. #4
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    Oklahoma
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    Default

    Just running my fingers over them in a circle its pretty smooth. Some have some light vertical scratches, maybe 4 or so sets on one I remember but not anything deep like a gorge.

  5. #5
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    I have no idea what the reccomended protocol is for the next step but I gather new engines of this variety are neither very expensive nor very rare if you end up needing one.
    1995 540i Manual build 1/95

  6. #6
    Join Date
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    Default

    your valve lash could have been set too tight not allowing the exhaust valves enough time to cool and they stuck in the guide and the pistons tapped them causing the busted crap. From the pics the block looks fine. New head time for sure at least but the scenerio goes like this. Engine runs although cylinders are dead creating an unusual force on the rod bearings... thus lower oil pressure and worn rod bearings. Soo... you could try swapping a head onto it or... probably for less money get a complete running engine and pop that in instead. The latter is what I would most likely choose.

    Good luck with it, be glad it ran as transportation as long as it has.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  7. #7
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    When I first started I was really hoping that I could use the same head. I called around and a machine shop offered to replace my valve seals for $60.00.

    If I bought a few new valves and had them readjusted is it possible that's all it would take to restore the motor?

    Or is the head gone for sure?

    That and a bit of work to clean out some of that carbon buildup.

  8. #8
    Join Date
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    Wellington,New Zealand
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    what is the build up n the spark plug???
    Gone but not forgotten

  9. #9
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    Quote Originally Posted by Paul in NZ View Post
    what is the build up n the spark plug???

    LOL>>.! looks like it blew lunch..
    1995 540i Manual build 1/95

  10. #10
    Join Date
    Apr 2008
    Location
    Belgium
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    Hello. I rebuilt my M20 head one month. I had a bent valve. and destroyed rocker arm. reason was: engine revved too high. First 2 pistons has some marks but the walls were smooth without marks.
    I rebuilt the head, changed the exhaust vavle seats and guides (they are the weakest) and with the Goetze gasket and Elring studs, it cost me 650 euros.
    I did it all myself so no other cost and it was a rewarding experience. I don't know in your area but a new M20 engine is 5000 euros and old ones in good shape are impossible to find. But then again my block was in good shape and there was no compression wave coming out of the oil cap. I have about 250k real kms and those 6 cylinders engine are sturdy. The head had already been rebuilt like yours.

    What do you used as coolant? I don't see any rust in the coolant passages.

    in your case I would replace the broken valve and check for cracks and check the guides and seats.

    you already ordered parts. buying a new engine would make no sense.

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