Broken Crankshaft Count?

[Dozerboy]

How often though? I think y'all are beating a dead horse right now. The fact of the matter is is nobody here knows 100% what the causes is. I do trust that GM probably has the best grasp on it and they decided to put their capital in a new crank. It would've been a whole lot cheaper for them just a slap in a new cam and change the firing order, but they stand to lose millions if they get it wrong. They still got a blackeye from the LB7s injector issues. Who knows where they plan on taking this new design maybe 600hp eventually.


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[kidturbo]

Unlike the LB7 injector issue, no one ever stepped up to say we'll cover that issue for everyone...

These fall under the early model CP4 category. If it breaks under warranty, no problem. Out of warranty, "We've never seen that problem before. Ya must have gotten some bad fuel..."

:spit:

 

[LBZ]

How often though?...........


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According to a couple GM tech friends of mine more often than you would think. Most were around the 160000 mile mark. Hell a friend of mine had his GM replacement engine break a crank on his lmm just under 30 000 miles after they installed it. It's very hit or miss it seems.

 

[Harbin_22]

When I broke mine, Danville had two bone stock trucks in the shop with broke cranks lol. Definitely not uncommon.

 

[Novak]

Let's say you got a crank that is doomed to one day break, would changing the cam actually do anything to prevent that. I know a result of changing the cam is reducing stress on the crank but would it be enough?


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[NC-smokinlmm]

Let's say you got a crank that is doomed to one day break, would changing the cam actually do anything to prevent that. I know a result of changing the cam is reducing stress on the crank but would it be enough?


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Probably cause it to break faster.

 

[zakkb787]

Let's say you got a crank that is doomed to one day break, would changing the cam actually do anything to prevent that. I know a result of changing the cam is reducing stress on the crank but would it be enough?


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Some say yes. Many say no. Some will give very long yet well thought out and factual explanations of why not. Others will argue that the harmonics will be better.

What I'm trying to say is there's no 100% concrete proof either way. :roflmao:

 

[Novak]

Some say yes. Many say no. Some will give very long yet well thought out and factual explanations of why not. Others will argue that the harmonics will be better.

What I'm trying to say is there's no 100% concrete proof either way. :roflmao:

I guess if I start mine one day and it sounds like a rock crusher the only thing I'm 100% about is getting 20K and a builder hahaha


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[Novak]

Probably cause it to break faster.

Considering if you had an aftermarket cam then you probably have other mods that want to break things


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[kidturbo]

While watching the 24hrs of Le Mans, I built this handy tool to tell what will fail on your Duramax.

Lets see who's crank will break next...:rofl:

The Wheel Of Failures

Enjoy !!

 

[Blackmax123]

Might as well add me to the broken crankshaft list.

2013 all stock, 114k miles on the clock.

 

[TheDirty06]

Anybody seen one break here before?

 

[kidturbo]

Interesting location... Who's?

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[TheDirty06]

Interesting location... Who's?

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Mine out of an LBZ

 

[JoshH]

Add me to the list. The beat down, 265k mile, 700 hp, stock motor shop truck just broke a crank last night. Poor ol' girl took a lot of abuse though.

 

[WolfLMM]

Bummer

 

[Burn Down]

That sucks Josh but damn thats alot of miles of abuse

 

[PureHybrid]

While watching the 24hrs of Le Mans, I built this handy tool to tell what will fail on your Duramax.

Lets see who's crank will break next...:rofl:

The Wheel Of Failures

Enjoy !!

Ha! I spun it 5 times, only got a burnt piston once. I'm feeling lucky

Add me to the list. The beat down, 265k mile, 700 hp, stock motor shop truck just broke a crank last night. Poor ol' girl took a lot of abuse though.

Probably those garbage tunes man, should get that done professionally :roflmao:

 

[kidturbo]

First #4 break I've seen.. In a core engine I picked up. Never enen noticed till pulled mains to lift out..

Someone please bump lbz/lmm count by 3 for me. That's how many we have seen hit the floor in past 2 months...

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[Hambone]

Hope you didn't pay for a working core