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Weird squealing when engine decelerates

Old 04-16-2019, 01:01 PM
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TheKobester
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Default Weird squealing when engine decelerates

I have a 2006 Z that I just changed the clutch, flywheel (lightweight), pressure plate, throw out bearing and pilot bushing on (all Excedy), and my first drive after cruising for a little bit I noticed that if I let off the gas between 3k and 2k rpm, I would get a squealing sound, sort of resembling a hamster stuck between some really old brake pads. It happens regardless of clutch engagement and gear (as well as neutral). If I donít do anything and let the engine coast down then Iíll get the squealing noise.

I initially thought it could be that I installed the pilot bushing wrong (how would I even be able to do that) or the throw out bearing. However, I ruled both of these out because

A) In my mind, a pilot bushing issue would get louder with speed, and this sound goes away after 3k rpm. Also, it wouldnít happen if the clutch was engaged since the bushing and input shaft would be spinning at the same speed

B) the throw out couldnít be the issue because it happens regardless of whether the clutch is pushed in or not, and throw out issues usually happen with the clutch pedal pushed in.

So im really confused as to what the issue could be, I initially thought it was something to do with new parts needing to be broken in, but now with about 1500 miles on the new clutch it seems that is not the case. The noise hasnít gotten louder or quieter in the time ive driven it, and it happens regardless of whether the engine is warm or cold.

I read around and couldnt find a match to my exact issue, but I saw a similar thread about something stuck on the VVT, but as far as I know Iíve never touched it and it only happened after I installed the new clutch. I also saw that it could be the lightweight flywheel but I donít think the sound was similar to mine and the circumstances were different.

Any and all help is appreciated and I will provide more info if needed
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Old 04-16-2019, 01:44 PM
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Spike100
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It is probably the transmission input shaft bearing making the noise you describe. This noise is a problem with the CD009 transmission. I believe the CD00A transmission (upgrade of the CD009) fixes this (no noise).

The noise is "cosmetic" and does not result in damage or a problem (other than it is annoying).
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Old 04-16-2019, 02:15 PM
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TheKobester
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Seems like a very likely culprit, except it happens with the clutch out too?
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Old 04-16-2019, 02:25 PM
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Spike100
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Originally Posted by TheKobester View Post
Seems like a very likely culprit, except it happens with the clutch out too?
For sure... I see that is when the noise is worse.

The CD00A fixes this noise, but the noise is probably not enough to replace the CD009 for just that reason.
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