Interesting valve failure - Page 2 - Chevelle Tech
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post #16 of 19 (permalink) Old Mar 22nd, 19, 1:18 AM
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Re: Interesting valve failure

How bad beat up is the valve seat in the head? I have seen this failure if the seat is not concentric. Usually it breaks the entire head off but the break usually occurs in the first few runs. I would check the valve seats in the heads.
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post #17 of 19 (permalink) Old Mar 22nd, 19, 7:28 AM
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Re: Interesting valve failure

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Originally Posted by Calculated Risk View Post
Honestly, sometimes stuff just breaks. Small defect in the material that you would never see or know about would be my guess

This is THE specific reason I hate to fly. Anything mechanical is subject to failure at any time.
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post #18 of 19 (permalink) Old Mar 22nd, 19, 8:28 PM
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Re: Interesting valve failure

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Originally Posted by Busted Knuckles View Post
This is THE specific reason I hate to fly. Anything mechanical is subject to failure at any time.
Ya when that big old fan stops turning.....the crew really starts to sweat......
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post #19 of 19 (permalink) Old Mar 23rd, 19, 5:05 PM
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Bill R
 
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Re: Interesting valve failure

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Originally Posted by sleeper View Post
How bad beat up is the valve seat in the head? I have seen this failure if the seat is not concentric. Usually it breaks the entire head off but the break usually occurs in the first few runs. I would check the valve seats in the heads.
Sleeper,
I don't think this valve failure was the result of non-concentric seat. As you have mentioned, a non-concentric seat will break the valve stem, just below the valve's head. This is due to the fact that the non-concentric seat is bending the valve stem back and forth as the engine runs which will break the valve stem just as bending a piece of wire back and forth will cause the wire to ultimately break.

I think this valve failure can be attributed to material problems/issues relative to the manufacturing process.
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