Y8 trans knocking with clutch pedal let out - D-series.org

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Old 08-01-2018, 07:06 AM   #1 (permalink)
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Default Y8 trans knocking with clutch pedal let out

Hi there. Iíve been working on building my turbo z6 and got everything done. Had some trouble keeping it running until after I did the valve lash adjustment. It now starts and runs(with a surging idle, my tuner should be able to tune that out hopefully) but had a terrible knocking sound. Originally thought I spun a bearing so I dropped the downpipe and oil pan. Checked the rods and everything seems tight. Turned the crank by hand and had trouble pinpointing the sound but found out that when the clutch is pressed in and turned the crank over by hand the sound goes away. Put everything back together fired her back up and found that when clutch pressed in it sounds good but once the clutch is let out it knocks something fierce. Hoping somebody has an idea of what this may be. Thanks.
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Old 08-01-2018, 07:13 AM   #2 (permalink)
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My first thought is throwout or pilot bearing.. **shrug**
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Old 08-01-2018, 07:18 AM   #3 (permalink)
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I was hoping to upload the video but it won’t load...
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Old 08-01-2018, 07:26 AM   #4 (permalink)
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I was doing some reading and that what seems to be most peoples issue. Shouldn’t be the tob though that, clutch and flywheel are all new. Wasn’t greased though....
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Old 08-01-2018, 07:47 AM   #5 (permalink)
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https://www.d-series.org/forums/tran...l-housing.html

Go to post 10. I've experienced this with a few clutches.

Or its the input shaft bearing.
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Old 08-01-2018, 12:38 PM   #6 (permalink)
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ISB or input shaft bearing would be my first guess
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Old 08-10-2018, 04:04 PM   #7 (permalink)
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You've definitely narrowed it down to clutch/transmission actuation/activation. Time to pull trans and see what you got!
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Old 08-10-2018, 06:48 PM   #8 (permalink)
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I had a similar problem when my transmission "lost" a couple bolts and wasn't sitting straight (shady mechanic didn't tighten anything down after swapping the engine). I would check the bearing make sure the tranny bolted up tight.
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