Clunk upon engaging clutch on shifts - ? normal or not - ZR-1 Net Registry Forums

SteelBlueZR1 · 09-14-2011

On my 1991 ZR1 with very low miles, I get a clunk sound on engagement of clutch (That is after shifting, and upon letting clutch out) when shifting in low gears. It seems to be less when shifting at higher engine speeds. Is this a function of the dual mass flywheel, a loose mount, or just normal for the ZR1?

SteelBlueZR1 · 09-15-2011

bump

QB93Z · 09-15-2011

Bert,

I suggest putting your car on the lift and checking that all of the drive train components are secure. We can check the C-Beam, drive shaft, half shafts, all 6 U-Joints, the hubs and the lugs.

We will be having a Westminster Maintenance Day on Sunday, 9 October. If you want to look at it sooner, I am busy on the weekends but if you give me a call we can look at it some evening.

Jim
443-244-1347

GOLDCYLON · 09-15-2011

I suggest beam plates.

rhipsher · 09-15-2011

I'll throw my. 02 in the hat. No its not normal. But I've heard the same sound on low mile ZR-1s to with only 20k on them. Some components wear out do to use. And others are age related regardless of how few miles are on the car. Clunk is usually a Ujoints issue. To test for loose beam bolts just look at your stick shifter upon hard acceleration. If it moves a 1/2 or more then your beam bolts are loose and you need to get Bills beam plates. I would take Jim up on his offer. I think he has a lift.

SteelBlueZR1 · 09-16-2011

Thanks for the input. I am going to take Jim up on his offer to stop over one night and stick her on the lift and have a look. I also hope to join WAZOO for the Westminster Maintenance Day on Sunday, 9 October. My shifter doesn't lift on acceleration btw, so maybe beam bolts are ok.

09-14-2011	#1
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Clunk upon engaging clutch on shifts - ? normal or not On my 1991 ZR1 with very low miles, I get a clunk sound on engagement of clutch (That is after shifting, and upon letting clutch out) when shifting in low gears. It seems to be less when shifting at higher engine speeds. Is this a function of the dual mass flywheel, a loose mount, or just normal for the ZR1? __________________ Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC] Last edited by SteelBlueZR1; 09-15-2011 at 10:56 AM.

09-15-2011	#2
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Re: Clunk upon engaging clutch on shifts - ? normal or not bump __________________ Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC]

09-15-2011	#3
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,689	Re: Clunk upon engaging clutch on shifts - ? normal or not Bert, I suggest putting your car on the lift and checking that all of the drive train components are secure. We can check the C-Beam, drive shaft, half shafts, all 6 U-Joints, the hubs and the lugs. We will be having a Westminster Maintenance Day on Sunday, 9 October. If you want to look at it sooner, I am busy on the weekends but if you give me a call we can look at it some evening. Jim 443-244-1347 __________________ If it isn't fun, you aren't doing it right! 1990 Black ZR-1 - sold 1993 Quasar Blue ZR-1 1994 Competition Yellow ZR-1 1995 Dark Purple ZR-1 Maryland State Coordinator WAZOO Member

09-15-2011	#4
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Clunk upon engaging clutch on shifts - ? normal or not I suggest beam plates. __________________ 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

09-15-2011	#5
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: Clunk upon engaging clutch on shifts - ? normal or not I'll throw my. 02 in the hat. No its not normal. But I've heard the same sound on low mile ZR-1s to with only 20k on them. Some components wear out do to use. And others are age related regardless of how few miles are on the car. Clunk is usually a Ujoints issue. To test for loose beam bolts just look at your stick shifter upon hard acceleration. If it moves a 1/2 or more then your beam bolts are loose and you need to get Bills beam plates. I would take Jim up on his offer. I think he has a lift. Last edited by rhipsher; 09-15-2011 at 09:32 PM.

09-16-2011	#6
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Re: Clunk upon engaging clutch on shifts - ? normal or not Thanks for the input. I am going to take Jim up on his offer to stop over one night and stick her on the lift and have a look. I also hope to join WAZOO for the Westminster Maintenance Day on Sunday, 9 October. My shifter doesn't lift on acceleration btw, so maybe beam bolts are ok. __________________ Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC]