New clutch installed and while driving there are significant vibrations when shifting?

Tiny
CRISPITO24
  • MEMBER
  • 2001 SUBARU LEGACY
  • 2.5L
  • 5 CYL
  • MANUAL
  • 200,000 MILES
Had new clutch installed with new flywheel. While driving there are significant vibrations when shifting. Also, when I get up to third gear, I can hear a knock or clunk sound and I am hesitant to push the car further. Is this normal when breaking in a new clutch or was the installation not done correctly? Also, after installing, the speedometer isn’t working and when I start the car there is a quick loud screeching, assume it’s probably a belt. Any suggestions on how to really know if the assembly of the clutch is correct?
Friday, July 19th, 2024 AT 5:02 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
No, this is not normal for a new clutch, it sounds like they have the wrong flywheel on the engine which will cause the vibration. Also, it sounds like they did not plug in the VSS sensor, which is why the speedometer is not working. Do me a favor and start the engine and with the transmission in neutral rev the engine is see if the vibration is there. Please upload a short video so I can see so we can be on the same page. Here is the location of the VSS sensor so you can see if it is connected.

The VSS is located on the right side of the transmission.

Let us know how it goes.
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Saturday, July 20th, 2024 AT 10:40 AM
Tiny
CRISPITO24
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So the noise I’m concerned about happens mostly between 1st and 2nd gear. It’s a clunking noise. I am thinking the guy who did this may have not tightened the bolts to spec and the pressure plate maybe uneven or maybe the release bearing needs adjustment? Not sure how to check for that. I do notice a little fluid coming from the slave cylinder but not enough to where the master cylinder has ever run dry so I don’t think there is air in the lines. The clutch fluid looks good, I don’t think the noise is coming from the master cylinder. I did find the connector on the transmission and it was unplugged so I plugged it in but the speedometer still isn’t working.
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Saturday, July 20th, 2024 AT 9:11 PM
Tiny
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Oops, my bad the speedometer is working now.
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Saturday, July 20th, 2024 AT 9:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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The starter noise is because it sounds loose (mounting bolts) or it needs to be replaced, I would check the starter mounting bolts. Also, the noise you hear between first and second sounds like the sub frame or engine mounts are loose, I would not drive the car anymore and take it back to the place that did the job and have them recheck it. The vibration is probably from the loose components. Thanks for the video, it helps.
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Sunday, July 21st, 2024 AT 11:15 AM

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