Lmls with "bad motors"

[RidinHigh99]

Our work trucks have 175k on them and their lml's. Deleted and tuned with a 40 horse h&s. 9 months out of the year they are hauling at the least a 7k empty deck over. They never don't have a trailer on them literally. No broken cranks yet but inter cooler boots have been the only problems.


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[02greysixer]

I've personally seen 3 lml with broken cranks. One had less than 100k miles and didn't work hard at all, one had just over 200k and towed often. Both stock emissions. 3rd one is a fleet truck we've maintained since about 70k miles. Regular service and never run hot. Deleted with h&s @ 100k. It made it to about 280k. It pretty much only unhooks from 10-12k lbs to come in for service. Same fleet also has an lml that popped a piston @ about 270k. 7 others all had some degree of cracking.

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[RKTMech]

Thanks for all the great feed back guys. :hug:

 

[Hot COCOAL]

Reading thru this, is it a reasonable deduction to say that GM is pushing the envelope of the materials being used, for the power output of the LML?

 

[Jackmo]

I wouldn't think they are pushing the limits of the material horsepower wise. I think it's more in the harmonics and balancing areas. The qc on these newer cranks seems to not be that great either.