Grinding after full clutch replacement
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Joined: Feb 2022
Posts: 99
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From: Ohio
Grinding after full clutch replacement
A little bit of background:
my experience is roughly 15yrs of automotive
2002 Z06 with 17k miles
Replaced factory clutch, master and slave cylinder with a monster/tick clutch package. Factory GM slave cylinder, tick master, monster clutch with the light weight 18lb flywheel. Pilot bearing went it smoothly. Everything lined up great. Properly torqued with calibrated torque wrenches in the correct order.
The problem:
grinding noise when it is in first gear and I am letting off the clutch. It is indeed in first, fully in. Sounds like I'm pushing past synchro or the starter is engaging. Weird right.
It ONLY happens under these conditions: if I have have the clutch depressed for a long-ish time. Like at a red light and it's still in gear. If I have it in neutral and press the clutch to put it into first, no issue at all. I have bled and readjusted to make sure. Again it only happens when I have the clutch held in for a decent amount of time like at a light or perhaps slow traffic.
Any ideas?!
my experience is roughly 15yrs of automotive
2002 Z06 with 17k miles
Replaced factory clutch, master and slave cylinder with a monster/tick clutch package. Factory GM slave cylinder, tick master, monster clutch with the light weight 18lb flywheel. Pilot bearing went it smoothly. Everything lined up great. Properly torqued with calibrated torque wrenches in the correct order.
The problem:
grinding noise when it is in first gear and I am letting off the clutch. It is indeed in first, fully in. Sounds like I'm pushing past synchro or the starter is engaging. Weird right.
It ONLY happens under these conditions: if I have have the clutch depressed for a long-ish time. Like at a red light and it's still in gear. If I have it in neutral and press the clutch to put it into first, no issue at all. I have bled and readjusted to make sure. Again it only happens when I have the clutch held in for a decent amount of time like at a light or perhaps slow traffic.
Any ideas?!
Drifting
Joined: Mar 2018
Posts: 1,365
Likes: 414
From: New Jersey
The way you describe it, it sounds like when the car is in gear for a while it' becomes not fully engaged or is slipping out of full engagement. If you didn't do a shifter adjustment, I would do one and see what happens. It can't hurt.
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Joined: Feb 2022
Posts: 99
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From: Ohio
I'll try that for sure. It definitely has the grinding frequency of the gear grinding but actually closer to start on flywheel almost. Not a low clunking.
I'm only hesitant to think it is an adjustment of the mechanical nature because it will shift in and out of first fine *unless* I am standing on the clutch for a long time like at a light then it does the grinding when I try to take off.
I'm only hesitant to think it is an adjustment of the mechanical nature because it will shift in and out of first fine *unless* I am standing on the clutch for a long time like at a light then it does the grinding when I try to take off.
Melting Slicks
Joined: Dec 2018
Posts: 2,663
Likes: 1,389
From: Orange County, CA
To me it sounds like maybe the clutch hydraulic system is gradually losing pressure, which is weird since it seems that your MC might be on the newer side.
Have you noticed if it happens more (or less) when the engine is warmed up vs when cold?
Also, was there any measuring for slave cylinder shims?
One thing I'd be interested in checking (if it were my car) is slave cylinder travel:
Have you noticed if it happens more (or less) when the engine is warmed up vs when cold?
Also, was there any measuring for slave cylinder shims?
One thing I'd be interested in checking (if it were my car) is slave cylinder travel:
- take off clutch inspection cover from bellhousing (after removing exhaust midpipe/cats section, or headers if the car has headers)
- depress clutch pedal, and note/measure travel of slave cylinder
- after some time (with clutch pedal still depressed the same amount) re-check slave cylinder travel
Thread Starter
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Joined: Feb 2022
Posts: 99
Likes: 30
From: Ohio
Right and that's what I lean towards is it's bleeding back or something but it's odd that it makes the noise while I am taking my foot off the clutch. If it were slowly bleeding off then the clutch would be applied. This noise will happen with it in gear, clutch down for extended period and on release it grinds. Or if I'm in neutral, clutch down, put it in first to take off
BUT ill will be taking it off and do that measurement because it only makes sense
BUT ill will be taking it off and do that measurement because it only makes sense
Melting Slicks
Joined: Dec 2018
Posts: 2,663
Likes: 1,389
From: Orange County, CA
Right and that's what I lean towards is it's bleeding back or something but it's odd that it makes the noise while I am taking my foot off the clutch. If it were slowly bleeding off then the clutch would be applied. This noise will happen with it in gear, clutch down for extended period and on release it grinds. Or if I'm in neutral, clutch down, put it in first to take off
BUT ill will be taking it off and do that measurement because it only makes sense
BUT ill will be taking it off and do that measurement because it only makes sense
