Piston disintegrated - K-Bikes.com - Excellence in Motion
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post #1 of 19 (permalink) Old Oct 22nd, 2007, 8:44 am Thread Starter
 
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Piston disintegrated

2 months after my warranty expires a loud knocking occurs in my engine. Take it to the dealer. The bottom end of my #2 piston broke into pieces. Massive internal damage. I'm looking at a $6000 repair. Has this happened to anyone else out there? I'm still in shock. Ideas?
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post #2 of 19 (permalink) Old Oct 22nd, 2007, 10:42 am
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Quote:
Originally Posted by Boxer8
2 months after my warranty expires a loud knocking occurs in my engine. Take it to the dealer. The bottom end of my #2 piston broke into pieces. Massive internal damage. I'm looking at a $6000 repair. Has this happened to anyone else out there? I'm still in shock. Ideas?
I read most of the posts and blown K-bricks are pretty rare. From memory I've only ever seen a couple of posts. Oilseal failures are common, but not your problem. If it wasn't some sort of flaw in the oem piston, I can only guess at some things. Get the other pistons checked for any similar signs of scoring or cracks in the same place. If there is anything, start looking at timing, pinking (pre-detonation), and oil supply. Get the bores checked for any defects, problems on their walls or significant scoring. The usual problem with the lower piston area shows as wear and scoring caused by seizure or oil problems. Has the motor been seriously overheated? The piston crown down to the bottom ring is often reduced in size compared to the bore, as the rings are the sealing component and being hotter the crown needs to expand more. But beyond the 3rd ring (the part you lost), that part of the piston is a close fit give or take a few thou. and is the first part to expand quickly when overheated then follows seizure. It's also the thinnest and weakest part of the piston since it requires little strength and only adds to the gas seal and balance. Some pistons are designed with very little skirt below the last ring. If the motor is running normally with no cooling problems, the piston crown is the hottest part and the skirts given sufficient oil should be running a lot cooler.

If it wasn't a casting defect, I think the piston skirt might have seized on the up-stroke, but I'm sorry to hear your problem which is serious and expensive.



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post #3 of 19 (permalink) Old Oct 22nd, 2007, 11:57 am Thread Starter
 
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Even the mechanics who looked at it are thinking casting defect. It was never overheated and the other cylinders, though we haven't completely dissassembled the engine, look fine. Yeah, and 6k is a lot of money to put back into a bike that would bring in less than 10k on a resale. Woe is me.
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post #4 of 19 (permalink) Old Oct 22nd, 2007, 12:17 pm
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I feel your pain. I spent $4,500 on a new tranny when the bike was worth only $5,000 at best. I was away from home many miles and did not want to just walk away from it and buy a plane ticket home. I do have many after market parts on it but if I was at home when it happened I would have thought hard about just parting it out.
Good luck with your decision.

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post #5 of 19 (permalink) Old Oct 22nd, 2007, 12:24 pm
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Quote:
Originally Posted by Boxer8
2 months after my warranty expires a loud knocking occurs in my engine. Take it to the dealer. The bottom end of my #2 piston broke into pieces. Massive internal damage. I'm looking at a $6000 repair. Has this happened to anyone else out there? I'm still in shock. Ideas?
Ask the dealer for some "help" from BMWNA, as it's 2 months out of warranty. They may provide some assistance as it's so close to the end of the warranty, but they may not. If you don't ask, the answer is going to be "No." Otherwise, you have a 50/50 chance.



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post #6 of 19 (permalink) Old Oct 22nd, 2007, 2:30 pm
 
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What does $6k buy? I see used long blocks from wrecks on ebay etc for $1500 or so.
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post #7 of 19 (permalink) Old Oct 22nd, 2007, 2:47 pm
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I will bet money BMW will wear it. They have replaced bits for me , like an exhaust system , when I had bought the bike second hand and it was well out of warranty. Yell scream and write
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post #8 of 19 (permalink) Old Oct 22nd, 2007, 3:22 pm Thread Starter
 
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I'm yelling

Trust me, I'm just starting to yell and I'll hope for the best. The group down at Colorado Springs BMW showed me the lower end with the damaged block and the need to replace all pistons as a unified structure. Said they were looking at at least $3000 in parts and they hadn't even opened up the top yet to look for damage. Now throw in replacement seals, bearings, etcetera on the rebuild and 30 hours of labor. It could reach 6K very easily.
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post #9 of 19 (permalink) Old Oct 22nd, 2007, 4:01 pm
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Ya might find out what a replacement motor costs vs. repairing the existing one.



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post #10 of 19 (permalink) Old Oct 23rd, 2007, 5:51 pm
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Ya might find out what a replacement motor costs vs. repairing the existing one.
Short engine at Chicago BMW is $7120.00.

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