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Flywheel broke 2012 V8 Silverado, with pics #5192263 08/20/19 05:10 PM
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01rangerxl Offline OP
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Had an interesting failure on a truck at work, 2012 Silverado 4.8L V8 / 4L60E auto with about 180K miles on it.

It has been making a knocking noise for a while that was suspected to be the flywheel...found out it for sure it was... LOL

[Linked Image]
[Linked Image]
[Linked Image]

The driver said there wasn't any real noise when it happened, it just stopped pulling as he was going down the interstate. He pulled over and it was still running, but the AC cut off, so he turned it off and tried to restart, and nothing. It took out the starter pinion too.

Reman starter, new flywheel, and a trans mount and it's back on the road. Amazingly no other damage. The guy who usually drives the truck is not abusive, but some of the previous operators probably were.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192288 08/20/19 05:48 PM
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bdcardinal Offline
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Well that's not ideal. O and before anyone says anything, Ford calls it a flywheel no matter if the vehicle is an automatic or manual transmission.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192289 08/20/19 05:49 PM
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Trav Offline
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Good time to do the rear main seal and front trans seal also, that would be high on my list while I was in there with 180K on it.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192301 08/20/19 06:00 PM
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??? Trying to think what could cause a failure like that. The only time it serves a purpose is when the starter kicks in. From what I can see, the teeth seem OK.

Thinking one of three things:

1) Defective part (weak metal or slightly warped) that gradually bent over time under starter load.
2) Starter somehow not installed properly and bendix gear not engaging squarely.
3) Bolts loosened-up over time.

Any other ideas?

Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192302 08/20/19 06:01 PM
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JLTD Offline
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Stopped pulling yeah I bet! Glad it was minor damage and back on the road...stuff snapping sometimes makes a mess.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: RayCJ] #5192311 08/20/19 06:19 PM
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ctechbob Offline
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Originally Posted by RayCJ

??? Trying to think what could cause a failure like that. The only time it serves a purpose is when the starter kicks in. From what I can see, the teeth seem OK.

Thinking one of three things:

1) Defective part (weak metal or slightly warped) that gradually bent over time under starter load.
2) Starter somehow not installed properly and bendix gear not engaging squarely.
3) Bolts loosened-up over time.

Any other ideas?



Well, it does transfer all the power from the engine to the torque converter, so there are constant stresses there. I'm going with there was some point on there that was jagged from manufacture and it formed a place for stress to concentrate and it just spread over time, or a weakness in the metal.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: Trav] #5192316 08/20/19 06:26 PM
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bdcardinal Offline
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Originally Posted by Trav
Good time to do the rear main seal and front trans seal also, that would be high on my list while I was in there with 180K on it.


Whenever I sell one or a clutch I suggest it but very few people want to do it. I guess they think I am a stealer type employee, their loss.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: bdcardinal] #5192329 08/20/19 06:45 PM
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01rangerxl Offline OP
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Originally Posted by bdcardinal
Well that's not ideal. O and before anyone says anything, Ford calls it a flywheel no matter if the vehicle is an automatic or manual transmission.


Haha, yeah I guess flexplate is the more technical term for an AT, but flywheel is the term I have usually heard and used. I think the part description GM used was "plate, a/t flex," but then elsewhere they refer to it as a flywheel.

Trav's advice would be the best way to go about it, but it wasn't a good time to try to get anything extra approved, so no dice.

As for the cause, no idea, but it has been a long time coming. It has been making noise for over a year, and a couple weeks ago the driver mentioned it sounded like it was getting worse.

Last edited by 01rangerxl; 08/20/19 06:48 PM.

2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192330 08/20/19 06:47 PM
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atikovi Online Content
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Originally Posted by 01rangerxl
Flywheel broke 2012 V8 Silverado, with pics


That's a flexplate.

Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192332 08/20/19 06:49 PM
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01rangerxl Offline OP
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Yes, yes, I know.....or flywheel.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192334 08/20/19 06:49 PM
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bullwinkle Offline
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Flex plate-that's why they break, too much "flexing"! I'm more amazed that a V8 truck 4L60E made it to 180K without blowing up, personally.


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Re: Flywheel broke 2012 V8 Silverado, with pics [Re: atikovi] #5192338 08/20/19 06:52 PM
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bdcardinal Offline
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Originally Posted by atikovi
Originally Posted by 01rangerxl
Flywheel broke 2012 V8 Silverado, with pics


That's a flexplate.


Ford for one calls them all flywheels no matter the transmission type.


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1995 Ford Mustang GT

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Opinions expressed are my own.
Re: Flywheel broke 2012 V8 Silverado, with pics [Re: bdcardinal] #5192347 08/20/19 07:05 PM
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atikovi Online Content
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Originally Posted by bdcardinal
Originally Posted by atikovi
Originally Posted by 01rangerxl
Flywheel broke 2012 V8 Silverado, with pics


That's a flexplate.


Ford for one calls them all flywheels no matter the transmission type.


OP's car is a Chevy.

Re: Flywheel broke 2012 V8 Silverado, with pics [Re: atikovi] #5192351 08/20/19 07:13 PM
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01rangerxl Offline OP
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Originally Posted by atikovi


OP's car is a Chevy.


If you want to nit pick it's a Chevrolet light truck, and it's not mine.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Flywheel broke 2012 V8 Silverado, with pics [Re: 01rangerxl] #5192364 08/20/19 07:30 PM
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atikovi Online Content
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Not picking nits, but if you go online or into a parts store and order a flywheel for a Chevrolet light truck, that's not what you're going to get.

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