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#1 |
![]() Join Date: Nov 2016
Location: Norway
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On a recent test drive I heard a rather disturbing noise coming from the transmission when the clutch is depressed, and the input shaft has a higher speed than the motor/flywheel.
If I just depress the clutch, there is no noise, but if I rev slightly in neural, clutch enganged, then depress the clutch, a loud rattling/grinding noise appears, and continues until clutch is engaged again. If it was the throw-out bearing, would it not make noise every time clutch is depressed? Is my dual mass flywheel failing? A quick and rather poor video of the noise; https://youtu.be/yHi75CXl2lM
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- '90 ZR-1 Last edited by S.hafsmo; 04-25-2017 at 05:14 AM. |
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#2 | |
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Location: Peoria, AZ
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director ![]() 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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#3 |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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Well, in any case it sounds like you're gonna be "in there" soon and find out for sure. But, I'm gonna guess it is the TO bearing or possibly the pilot bushing. (I once has an input bearing on a M21 go bad - sounded pretty bad like the video - but it was worse w/ the clutch OUT than with it depressed, For What It's Worth (FWIW).
Might as well... ...have a new disc on hand when you go in there - sorta mitigates the trouble of going in there in the first place - call it a "clutch overhaul" - freshen everything up at the same time. ![]() And...unless the clutch PP or FW surface was burned or worn as result of metal to metal contact/damage to the PP or the FW, there's no concern for "turning" either. The new disc will quickly break-in after a 100 miles of so of use with normal driving. (The Veleo PP is slightly beveled in toward the center. So, you want to avoid any drag race type clutch engagements until the disc has a chance to assume the shape of the disc/FW surfaces.)
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 04-25-2017 at 09:40 AM. |
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#4 |
![]() Join Date: Nov 2016
Location: Norway
Posts: 397
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Thanks GC. Qurious to hear what he has to say on the matter.
Paul, Sure seems I'll be going in there. Really hoping it's not the input shaft, but surely that would make noise (as you mention) when clutch is out as well? I'm considering to get a clutch kit from ecklers or something. They're about $400 including pressure plate, pilot-, and throwout bearing. I kinda want a new DM flywheel as well, but then we're in a different league cost-wise. Not that the price is a problem, but annoying if the old FW is still good. Can you tell if it's busted with the tranny/clutch removed? Anything else one might need in there? clutch fork pivot ball?
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- '90 ZR-1 Last edited by S.hafsmo; 04-25-2017 at 02:10 PM. |
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#5 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,147
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Woodpeckers them dern woodpeckers again!
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#6 |
![]() Join Date: Jul 2012
Location: Michigan
Posts: 182
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i have a similar noise (hard to tell from video) in my car. I have a single mass flywheel. let me know what you find out
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Ron Thompson 1990 421ci ZR-1 2010 ZR1 (stock) |
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#7 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,147
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You know with a single mass flywheel and a centerforce clutch my trany sound like a shaking box of rocks when in neutral!
But there is nothing wrong. |
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#8 |
![]() Join Date: Jan 2010
Location: Mystic CT
Posts: 2,623
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So, it's a box of rocks!
I always thought it was your Roy Rogers lunch box half full of nuts and bolts? Last edited by Mystic ZR-1; 04-25-2017 at 05:54 PM. Reason: . |
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#9 | |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,147
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Old Roy can really get you out of trouble when needed. You have your ZR-1 together yet? We had five cars out in the rain Saturday. |
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#10 |
![]() Join Date: Jul 2012
Location: Michigan
Posts: 182
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I'm used to the normal box of rocks. I also have a sound like the OP
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Ron Thompson 1990 421ci ZR-1 2010 ZR1 (stock) |
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