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  #1  
Old 04-16-2007, 01:27 PM
RyanM RyanM is offline
 
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Default What would cause this?
This is picture from a Archer II. A co-worker was flying was the 2nd to last person to fly this plane. The pilot & passenger were not hurt during the forced landing.

What would cause this type of failure in an engine?

According to my co-worker, the Haverikommisionen (the Danish NTSB), said they have never seen an engine ?break up? like that and they requested the engine for further examination.

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Last edited by RyanM : 04-16-2007 at 01:38 PM.
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  #2  
Old 04-16-2007, 01:40 PM
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Brantel Brantel is offline
 
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Rod Failure.

Saw a VW bug engine do that once.
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  #3  
Old 04-16-2007, 01:40 PM
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It looks like either a connecting rod broke or perhaps the crankshaft let go. I've seen similar damage in some auto engines after a rod failure due to over revving or oil starvation.
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Old 04-16-2007, 01:43 PM
rtry9a rtry9a is offline
 
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Hard to say without taking the engine apart, but it looks like the rod is badly bent. Possibly caused by overspeeding the engine, a broken crankshaft, or even from a broken/dropped exhaust valve that might be lodged in the top of the piston???
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  #5  
Old 04-16-2007, 02:00 PM
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Geico266 Geico266 is offline
 
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Dang mogas. A little JB Weld and it will be good as new.

The preceeding was a politically incorrect joke.
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  #6  
Old 04-16-2007, 02:19 PM
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pierre smith pierre smith is offline
 
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Default A few reasons
If at overhaul the rod bolts were not replaced or overtorqued. I had an IO-520 Conti years ago that cracked an oil cooler which was replaced. The gasket was bad so the mechanic used some RTV as a gasket. Bear in mind that this oil cooler bolted directly to the engine's oil cooler adapter plate.

The next day, the engine threw a rod right through the case. A piece of RTV was lodged in the crank oil passage and starved that rod.....Kaboom!

Chit happens,
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Old 04-16-2007, 02:32 PM
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Jkkinz Jkkinz is offline
 
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If you magnify the picture a little, you can see some details better that support probable rod failure. The flange on the bottom of the jug is bent outward with the surrounding cast material being fractured (pealed) laterally as well. That can only be from something inside trying to get out.
My guess would be that the rod let go and was thrown into the case resulting in your vent hole.

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Old 04-16-2007, 04:11 PM
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K?hler K?hler is offline
 
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"Looks like we threw a rod."

"Is that bad?"

"Yup."

-Seriously, very glad everyone was OK.
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  #9  
Old 04-16-2007, 04:42 PM
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flyeyes flyeyes is offline
 
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Quote:
Originally Posted by K?hler
"Looks like we threw a rod."

"Is that bad?"

"Yup."

-Seriously, very glad everyone was OK.
Seriously. You can't post the quote without a link.

The quote is at about 5:30 in the 8 minute clip
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Old 04-16-2007, 05:11 PM
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Default Where did that engine come from?
Can anyone identify the logo on the engine?

Kent
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