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Thread: Is my piston ok after bent valve?

  1. #1
    Join Date
    Apr 2019
    Location
    Littleton
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    1
    My Cars
    BMW e36 325ic

    Is my piston ok after bent valve?

    So awhile back I was driving my 1994 E36 325i convertible and long story short I missed a gear and over-reved it. It started misfiring and with a compression test it showed cylinders one through five had 150PSI as they should. Number six however had 75 indicating bent intake and exhaust valves. I pulled everything apart including the head and I can't tell how badly its bent or if the cylinder itself is still ok. Was wondering If anyone could help me determine this? It is my first time going into an engine this far and I frankly don't know what I'm looking
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    Last edited by shogun; 04-21-2019 at 05:56 PM. Reason: trying to fix the not working pics

  2. #2
    Join Date
    Jan 2005
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    Japan
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    54,737
    My Cars
    11/88 E32 750iL+98 E36M3
    moved to E36 forum from Forum Software Questions & Suggestions. Try to upload the pics on a free server and posts the links, I try to fix your pics, but no success.
    Last edited by shogun; 04-21-2019 at 05:57 PM.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Jun 2010
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    NY
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    1997 328i
    Images aren't showing, use another host.
    Attn. NEWBIES: Use the search feature, 98% has already been discussed.
    Click the search button, select "search single content type", select the "e36 sub forum" specifically, try the "search titles" then try the "search entire posts".

  4. #4
    Join Date
    Sep 2006
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    NW suburban Chicago
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    hiss by my window
    Can't see images but it's doubtful the piston is ruined. Typically they'll have "witness marks" from the event and smoothing any sharp raised edges that would promote detonation is all that needs to be done. Again, can't see your photos so............

    If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. - Mark Donohue

  5. #5
    Join Date
    Nov 2011
    Location
    Loiusiana
    Posts
    8
    My Cars
    1998 BMW E36
    Quote Originally Posted by ross1 View Post
    Can't see images but it's doubtful the piston is ruined. Typically they'll have "witness marks" from the event and smoothing any sharp raised edges that would promote detonation is all that needs to be done. Again, can't see your photos so............
    Yeah it's hard to really say without seeing the photos, but if it was a quick over rev and you didn't bang on it for long I'd say just your valves are ruined but likely didn't cause detrimental damage to the piston head.

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