here it is....SmokinS4's turbo failure analysis......in case you wanted to know
11-07-2003, 06:16 PM
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here it is....SmokinS4's turbo failure analysis......in case you wanted to know
<img src="http://pictureposter.audiworld.com/33927/106_0673.jpg">
this is a pic of all the parts. before tearing them down i tested the wastegates and they were opening at the correct pressure.
<img src="http://pictureposter.audiworld.com/33927/106_0674.jpg">
here are the compressor wheels. as you can see they both have FOD. Matt and I have some theories as to why both have FOD when there was only one clamp. Neither of the wheels burst, which mostly rules out overspin. If overspin occured and caused the failure, then the compressor wheel would have burst. i can post pics of that later.
<img src="http://pictureposter.audiworld.com/33927/106_0676.jpg">
this is the seal plate of the turbo that got the clamp. after the turbine wheel broke, the remaining part of the wheel thrust towards the turbine side and broke out the seal plate and wedged the wheel into the housing.
<img src="http://pictureposter.audiworld.com/33927/106_0682.jpg">
<img src="http://pictureposter.audiworld.com/33927/106_0680.jpg">
these are the housings, you can see all the damage from the FOD and wheels hitting the housings.
<img src="http://pictureposter.audiworld.com/33927/106_0690.jpg">
broken turbine wheel. you can see on the turbine side, there is a little evidence of heat from the darkening on the shaft.
<img src="http://pictureposter.audiworld.com/33927/106_0693.jpg">
these are the radial bearings the the thrust bearings. there is no oil contamination, they look really good. on the thrust bearing you can see where the thrust from the broken shaft broke out and wore the bearing
let me know if i left anything out
this is a pic of all the parts. before tearing them down i tested the wastegates and they were opening at the correct pressure.
<img src="http://pictureposter.audiworld.com/33927/106_0674.jpg">
here are the compressor wheels. as you can see they both have FOD. Matt and I have some theories as to why both have FOD when there was only one clamp. Neither of the wheels burst, which mostly rules out overspin. If overspin occured and caused the failure, then the compressor wheel would have burst. i can post pics of that later.
<img src="http://pictureposter.audiworld.com/33927/106_0676.jpg">
this is the seal plate of the turbo that got the clamp. after the turbine wheel broke, the remaining part of the wheel thrust towards the turbine side and broke out the seal plate and wedged the wheel into the housing.
<img src="http://pictureposter.audiworld.com/33927/106_0682.jpg">
<img src="http://pictureposter.audiworld.com/33927/106_0680.jpg">
these are the housings, you can see all the damage from the FOD and wheels hitting the housings.
<img src="http://pictureposter.audiworld.com/33927/106_0690.jpg">
broken turbine wheel. you can see on the turbine side, there is a little evidence of heat from the darkening on the shaft.
<img src="http://pictureposter.audiworld.com/33927/106_0693.jpg">
these are the radial bearings the the thrust bearings. there is no oil contamination, they look really good. on the thrust bearing you can see where the thrust from the broken shaft broke out and wore the bearing
let me know if i left anything out
