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#1 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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cracked flywheel symtoms
i think that i might have a cracked flywheel. lately i have been hearing this clicking in my engine compartment only when i give it gas. i have looked at everything and nothing was out of order. no loose bolts or anything making contact with anything. then the next time i heard it. i got down by the flywheel and torque converter and that is where the sound is coming from. how much does a new converter cost? if i found one in a parts yard, would that be a bad idea?
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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 |
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#2 |
Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: cracked flywheel symtoms
Do you think it's the converter? I think if you're hearing the noise from there it's the flywheel. I bought my new one for $35 at the local parts house. I'm not sure what a converter costs though.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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#3 |
Gone Fishing
Join Date: Aug 2005
Location: Fort Worth, Texas 76135
Posts: 12,361
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Re: cracked flywheel symtoms
a cracked flywheel sound tinney. crawl under the truck and use a flash light to look around the flywheel bolts and the holes that are punched in the flywheel
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68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop ![]() 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616 |
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#4 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: cracked flywheel symtoms
If you are going to go to the trouble off buying a new flexplate for your engine. Purchase one that is SFI rated and heavy duty. I went through a couple flexplates on one truck until I got smart and purchased a heavier plate. The torque convertor ballooning is what cracks them, That is by design, so it is not bad.
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#5 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: cracked flywheel symtoms
what is ballooning? the sound is a high pitch clanking. what tooth flywheel will i need?
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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 Last edited by crm318; 05-21-2007 at 02:08 PM. |
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#6 |
Gone Fishing
Join Date: Aug 2005
Location: Fort Worth, Texas 76135
Posts: 12,361
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Re: cracked flywheel symtoms
Should be a 168 tooth. I agree go SFI approved. I havechanged out to stock one in mine before I went SFI
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68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop ![]() 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616 |
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#7 |
Registered User
![]() Join Date: Sep 2005
Location: British Columbia CANADA
Posts: 118
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Re: cracked flywheel symtoms
I had my transmission out to relpace the pump seal and noticed the flexplate was cracked. Very common for these engines. Was not making any noise at the time but it had just started to crack.
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1969 C20 Customer Camper CST, 396, TH400, Factory A/C, Olive Green. |
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#8 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: cracked flywheel symtoms
As you apply different RPMs and change pressure on the tranny the torque convertor balloons out and changes sizes and thicknesses, that is ballloning on the convertor. That causes the flexplate to crack and make those funny chirping noises from under your truck. So to fight back get a thicker and heavier duty flex plate. (note the name)
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#9 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,142
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Re: cracked flywheel symtoms
We bought my Sons truck cheap becase the guy said it had a rod knox. It was just a cracked flywheel, it sounded bad on acceleration
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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