what does a cracked flywheel sound like - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 06-12-2007, 12:51 AM

i have been having a metal on metal contact sound coming from the flywheel area. its louder in the beginning of a gear and lightens up and then gets loud as it shifts into the next gear. is this a cracked flywheel sound?

CrashEd · 06-12-2007, 01:12 AM

Pull the cover and make sure its not the torque converter bolts if there tight you should beable to look with a flashlight and see a crack around the crank.
Ed

bigtruck81 · 06-12-2007, 04:32 PM

a cracked flexplate sounds like a lower end knock, ive heard some that sounded like main bearings,others sounded like rods. TC bolts typically sound like rods.,

RUST · 06-12-2007, 07:16 PM

I agree. Mine sounded like a rod knocking, so I got a crate 350 to replace a 305. After removal flexplate was cracked at crank bolts. Anyway, I got a 350.

crm318 · 06-13-2007, 12:30 AM

well i got under the truck and inspected it with a flashlight. i couldnt see any cracks, however it might be cracked around the crank and not the bolts.

RACINJASON22 · 06-13-2007, 12:44 AM

I agree, I have heard them sound just like a rod knocking.

Hope you get it figured out.

RJ22...

crm318 · 06-13-2007, 01:21 PM

it sounds like a dryer with a hand full of pennies. it is loudest at the beginning of each gear.

Mickey_D · 06-13-2007, 09:33 PM

Are you sure it's the transmission? I've heard pebbles in the catalytic converter heat shield described as you have.

crm318 · 06-14-2007, 01:20 AM

i dont have any emissions stuff. my truck is a 72 cheyenne.

MylilBowTie · 06-17-2007, 09:57 PM

Maybe broken vain(s) in the torque convertor?

mexgrhd68 · 06-18-2007, 02:30 AM

Quote:

Originally Posted by RACINJASON22

I agree, I have heard them sound just like a rod knocking.

Hope you get it figured out.

RJ22...

*screamin_eagle* · 06-18-2007, 03:20 PM

had the same problem with my jeep thought it was carbon balls in the cat so i took my handy dandy angle grinder and removed it for some reason I couldnt find any wrench or socket that would fit the bolts. anyway got it put back together without the cat and still had the noise. pulled the trans one day to fix a leak got to looking around and found the crack.

06-12-2007, 12:51 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	what does a cracked flywheel sound like i have been having a metal on metal contact sound coming from the flywheel area. its louder in the beginning of a gear and lightens up and then gets loud as it shifts into the next gear. is this a cracked flywheel sound? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

06-12-2007, 01:12 AM	#2
CrashEd 72 chevy Join Date: Jan 2007 Location: Central Il Posts: 725	Re: what does a cracked flywheel sound like Pull the cover and make sure its not the torque converter bolts if there tight you should beable to look with a flashlight and see a crack around the crank. Ed

06-12-2007, 04:32 PM	#3
bigtruck81 Registered User Join Date: Feb 2004 Location: northern, in Posts: 350	Re: what does a cracked flywheel sound like a cracked flexplate sounds like a lower end knock, ive heard some that sounded like main bearings,others sounded like rods. TC bolts typically sound like rods.,

06-12-2007, 07:16 PM	#4
RUST Registered User Join Date: Nov 2004 Location: Roanoke, AL Posts: 18	Re: what does a cracked flywheel sound like I agree. Mine sounded like a rod knocking, so I got a crate 350 to replace a 305. After removal flexplate was cracked at crank bolts. Anyway, I got a 350.

06-13-2007, 12:30 AM	#5
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: what does a cracked flywheel sound like well i got under the truck and inspected it with a flashlight. i couldnt see any cracks, however it might be cracked around the crank and not the bolts. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

06-13-2007, 12:44 AM	#6
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: what does a cracked flywheel sound like I agree, I have heard them sound just like a rod knocking. Hope you get it figured out. RJ22... __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

06-13-2007, 01:21 PM	#7
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: what does a cracked flywheel sound like it sounds like a dryer with a hand full of pennies. it is loudest at the beginning of each gear. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

06-13-2007, 09:33 PM	#8
Mickey_D Dirteh Kitteh Join Date: Nov 2006 Location: Mormon country Posts: 2,484	Re: what does a cracked flywheel sound like Are you sure it's the transmission? I've heard pebbles in the catalytic converter heat shield described as you have. __________________ Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL

06-14-2007, 01:20 AM	#9
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: what does a cracked flywheel sound like i dont have any emissions stuff. my truck is a 72 cheyenne. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

06-17-2007, 09:57 PM	#10
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: what does a cracked flywheel sound like Maybe broken vain(s) in the torque convertor? __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

06-18-2007, 03:20 PM	#12
screamin_eagle Account Suspended Join Date: Dec 2005 Posts: 114	Re: what does a cracked flywheel sound like had the same problem with my jeep thought it was carbon balls in the cat so i took my handy dandy angle grinder and removed it for some reason I couldnt find any wrench or socket that would fit the bolts. anyway got it put back together without the cat and still had the noise. pulled the trans one day to fix a leak got to looking around and found the crack.



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