Clutch Pedal Vibration
01-18-2018, 05:03 AM
#1
Thread Starter
Clutch Pedal Vibration
I'm getting an odd vibration at the clutch engagement point following a CMC replacement. I checked for crank play and movement was absolutely minimal, I had to zoom in 100% on the video to see any movement at all. The car got a new clutch about 15k miles ago with new OEM TO, Flywheel, PP and disk. All AP1 hardware on an AP2 if it matters (AP1 flywheel, slave etc).
Fast, minimal vibration.
Most noticeably during rev-matched downshifts
Only felt around the engagement point
Free play is at zero
I can feel the vibration when lightly pressing the clutch past the CMC free play
No vibration felt past engagement point
Did not have this before replacing a leaky CMC and bleeding the system. Any ideas? I may throw a little bit of free play back into the adjustment just to see if that solves it, but nothing seems wrong with the car other than the vibration. Any ideas?
Fast, minimal vibration.
Most noticeably during rev-matched downshifts
Only felt around the engagement point
Free play is at zero
I can feel the vibration when lightly pressing the clutch past the CMC free play
No vibration felt past engagement point
Did not have this before replacing a leaky CMC and bleeding the system. Any ideas? I may throw a little bit of free play back into the adjustment just to see if that solves it, but nothing seems wrong with the car other than the vibration. Any ideas?
01-18-2018, 05:30 AM
#2
Join Date: Mar 2017
Location: Waterford, MI - America's High Five
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Give the clutch a few 2nd gear launches with reasonable slip (do not go crazy revving it to the moon on launch). If the clutch isn't perfectly straight, this could be a disk thing. Sometimes the little springs in the disc itself aren't quite right either.
Do that and report back.
Edit: Did you delete the clutch delay valve in the process? This is a dampening mechanism in the hydraulic system as well as something to prevent hard impacts.
Do that and report back.
Edit: Did you delete the clutch delay valve in the process? This is a dampening mechanism in the hydraulic system as well as something to prevent hard impacts.
Last edited by HawkeyeGeoff; 01-18-2018 at 05:32 AM.
01-18-2018, 05:53 AM
#3
Thread Starter
Give the clutch a few 2nd gear launches with reasonable slip (do not go crazy revving it to the moon on launch). If the clutch isn't perfectly straight, this could be a disk thing. Sometimes the little springs in the disc itself aren't quite right either.
Do that and report back.
Edit: Did you delete the clutch delay valve in the process? This is a dampening mechanism in the hydraulic system as well as something to prevent hard impacts.
Do that and report back.
Edit: Did you delete the clutch delay valve in the process? This is a dampening mechanism in the hydraulic system as well as something to prevent hard impacts.
Clutch delay was deleted about a year ago when the clutch was replaced. Ap2 slave was swapped with ap1 slave. Only change when the vibration started was new CMC, fluid bleed and a pedal adjustment as part of the CMC swap.
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HawkeyeGeoff (01-18-2018)
01-18-2018, 06:03 AM
#4
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Was the CMC an OEM or aftermarket?
01-18-2018, 07:45 AM
#5
Thread Starter
OEM Honda, alright I'll take a look. Honestly it feels like drive train vibration going through the pedal.
01-18-2018, 10:40 AM
#6
Join Date: Mar 2017
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Well that's exactly what it is. I would put my money on clutch shudder; I'm a Manual Trans Dev/Val Engineer by trade so that is typically what I would call it if what you're saying to me is correct. I haven't ever seen a master cyl effect a clutch engagement like you're indicating.
01-18-2018, 11:23 AM
#7
Any remote chance you may have gotten oil or grease onto the flywheel? Perhaps, in an event unrelated to the clutch bleeding.
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01-18-2018, 01:58 PM
#8
Thread Starter
im pulling the freeplay back a bit and seeing if maybe I went too far
01-27-2018, 04:21 AM
#10
Thread Starter
Added some freeplay and no difference. It's definitely intermittent. I might try another bleed when I can, but I'm at a bit of a loss. I have to imagine it has to do with the CMC, fluid or the adjustment.
