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My piston has a hole in it. see photo. 700 1989

posted by  bobsealover on  Thu Aug 16 13:54 CST 2007
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last visit: Wed Sep 12 06:48 CST 2007
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It was a little tough to tell from the top (after removing the head) so I removed the piston.

Yup. It's a hole. Good news is the cylinder wall looks REALLY nice for having a piston melt inside it.

This one is definitely going in the "museum" of car parts I've broken. (even though I really didn't break this, I bought the car this way)



that's the image in the photo section of this site. I hope it shows up I've never posted an image before.

Rob









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    My piston has a hole in it. see photo. 700 1989

    posted by  mgarageu on  Thu Aug 16 20:46 CST 2007
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    last visit: Sun Mar 9 03:34 CST 2008
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    hello
    perfect image of damaged piston. what engine model was it installed in? any other damages/faults within engine block? what about oil and fuel within that car?
    --
    i prefer non-german cars








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      My piston has a hole in it. see photo. 700 1989

      posted by  bobsealover on  Fri Aug 17 06:23 CST 2007
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      It was a B230F. I haven't found any other damages. The other 3 pistons look good. There was some pretty thick oil sludge laying in the bottom of the oil pan (I know -- I dropped a rod end cap bolt into it)

      Someone put some "stop leak" in it and it clogged some of the coolant passages, particularly the ones near the #3 cylinder which is the one in the photo. Also, the car had a head gasket done on it only a few weeks before. Something may have been done improperly resulting in this. I bought the car this way -- so I can only speculate.

      ROb








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        My piston has a hole in it. see photo. 700 1989

        posted by  Rolyak on  Fri Aug 17 07:08 CST 2007
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        last visit: Fri Oct 24 08:03 CST 2014
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        We do piston failure analysis here at Mahle-Clevite Engine Parts and while the picture is not totally clear I would say you had abnormal combustion AKA detonation. Appears that this was a "top down" failure.

        Check for a bad injector, timing issues, previous overheat,lean fuel mixture,incorrect octane, actually too much carbon in the cylinder could raise the compression ratio enough to create detonation even on the correct grade of fuel.

        Never forget that aluminum melts at a much lower temperature than typical combustion chamber temperatures. Atomised fuel forms a boundry layer of gas (not gasoline) that protects the piston. Raw or dripping fuel destroys that boundry layer.

        Pretty amazing when you think about it!








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          My piston has a hole in it. see photo. 700 1989

          posted by  bobsealover on  Fri Aug 17 07:24 CST 2007
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          Good point about the raw or dripping fuel -- the damage to the piston was at the lowest point in the chamber. (The B230F engine is a slanted engine as you know) if fuel dripped in there, that's where it would lay.

          I've never driven the car (I bought it this way as a fixer-upper) so I'll pay very close attention to how it runs once it's back together.

          Thanks for the technical info. :)
          Rob








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        My piston has a hole in it. see photo. 700 1989

        posted by  mgarageu on  Fri Aug 17 07:00 CST 2007
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        last visit: Sun Mar 9 03:34 CST 2008
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        hello
        new piston, lots of engine coolant system flush...it will run again...
        --
        i prefer non-german cars








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          My piston has a hole in it. see photo. 700 1989

          posted by  bobsealover on  Fri Aug 17 07:09 CST 2007
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          I hope so! that's my plan. I'm going to try to knock the gunk out of the coolant passages with a pipe cleaner or something while I have the head off. For some reason they don't seem as clogged in the block -- just the head. From what I read the stop leak junk interacts with air and hardens. Air would rise to the top of the coolant system. :)

          Thanks
          ROb







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