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Old 10-29-2006, 10:03 PM   #1
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I've noticed over the past couple of months that my turbo occasionally makes a pretty loud shrieking sound on spooldown. Sounds like metal to metal shrieking like a bearing going out or something. The turbo seems to spool just fine and I don't detect much shaft play (there is a tiny amount, not sure how normal that is because this is baby's first turbo). I assume this isn't normal, but i'm curious as to what i can do about it? Does a rebuild usually replace all the bearings?
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Old 10-29-2006, 10:36 PM   #2
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Yup, a rebuild kit will replace everything except the housings, CHRA, shaft, and blades... but with only a little shaft play and (I assume not smoking), you might want to look at something else. A turbo that needs a rebuild should always smoke at least a little.
You're 100% positive it's the turbo?
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Old 10-29-2006, 10:39 PM   #3
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Yeah, no smoke at all and no oil in my IC pipes. I can't think of anything else on the car that would make that noise at that instant. I'll see if i can catch a video of it. i think my phone captures small videos.
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Old 10-29-2006, 11:03 PM   #4
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In/out shaft play is normal, and a little is acceptable. Side/side shaft play occurs as the bearings wear down and the shaft can move around more freely.
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Old 10-30-2006, 12:08 AM   #5
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Don't mean to alarm you or anything, but when one of our fire engines did that it was just after it had ingested a small bolt.
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Old 10-30-2006, 01:45 AM   #6
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there's no percussive sound to it at all though. it's more like dragging your fingernails down a chalkboard.

the turbo is probably due for a rebuild anyway with the miles that are on it. Where would i look for a rebuild kit for a stock Greddy kit turbo?
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Old 10-30-2006, 10:46 AM   #7
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Old 11-01-2006, 11:24 PM   #8
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if its only on spool down , then it may be a faulty BOV staying closed on throttle off...causing compressor surge which sounds like that...just a thought.
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