Crank needs to be keyed and Fluidampr balancer installed as preventive maintenance. Some Duramax are worse than others. LBZ and LMM are typically the worst.
Go with an alternate firing order cam. Its amazing that the crank doesn't completely destroy the front of the block when it breaks like that. SBC factory steel cranks typically break at the same point, but the front of the crank usually goes right through the block and you are left with giant paper weights.
Not sure what kind of Boost or Power they were Put’n to that engine but we’ve Ran Duramax Trucks on the Ranch since 2001 some with over 400,000 miles and haven’t Babied them at all and have never had any Rod, Piston or Crankshaft Issues whatsoever………
The valve clearances are needed for certain camshafts, delipping should be done on all duramax’s in my opinion. I would like to find a shop that can do it for me. The trick is, they all have to way the same
it could be timing .. or bad casting.. iv built a lot of perkins diesel engines and if they are not timed correctly they will brake the crank,, so with brings us to the next question TUNNER WAS THERE A TUNNER ON THIS ENGIN... i will not buy a truck that has had a tunner on it ..... put a nother tunnnnnner on it
As a diesel mechanic for 38 years, that is the worst engine made to this day people buy them because they think the pick up looks good. Need to check the heart stay away from them Duramax they will not change.
If they were the worse engine you wouldn’t have people that love them and that are getting 500,000 miles from them. A guy on the lb7 group hit 1 million miles on his truck.
I believe the LB7 and LLY have the same piston rid assembly.
Yes they do
Crank needs to be keyed and Fluidampr balancer installed as preventive maintenance. Some Duramax are worse than others. LBZ and LMM are typically the worst.
100% agree with the fluidampr balancer.
Definitely could have prolonged the life
Go with an alternate firing order cam. Its amazing that the crank doesn't completely destroy the front of the block when it breaks like that. SBC factory steel cranks typically break at the same point, but the front of the crank usually goes right through the block and you are left with giant paper weights.
First time I have ever heard of this and I have had duramax trucks for years.
It’s more common than your think, I’ve come across it 4 different times in the last year… and I only work on them part time
Not sure what kind of Boost or Power they were Put’n to that engine but we’ve Ran Duramax Trucks on the Ranch since 2001 some with over 400,000 miles and haven’t Babied them at all and have never had any Rod, Piston or Crankshaft Issues whatsoever………
It’s a luck of the draw kinda thing. I’ve also had multiple 400k miles truck with no issues
do you delip the LB7 pistons for valve clearance and lower compression? other then that its not needed right ?
The valve clearances are needed for certain camshafts, delipping should be done on all duramax’s in my opinion. I would like to find a shop that can do it for me. The trick is, they all have to way the same
Money Pit!
I'm going the alt fire cam when I fix my crank ('11 lml)
Hopefully you have reliable tuning for alt firing cam.
Will I need a fluidamper if I’m using a Callie’s Compstar crank?
Yes, and will need to get the rotating assembly balanced
Where are you buying your new crankshaft from?
Callie’s Compstar crank from DHD
Harmonics on a crankshaft not designed for the loads being applied to it.
it could be timing .. or bad casting.. iv built a lot of perkins diesel engines and if they are not timed correctly they will brake the crank,, so with brings us to the next question TUNNER WAS THERE A TUNNER ON THIS ENGIN... i will not buy a truck that has had a tunner on it ..... put a nother tunnnnnner on it
As a diesel mechanic for 38 years, that is the worst engine made to this day people buy them because they think the pick up looks good. Need to check the heart stay away from them Duramax they will not change.
lol ok
3.0L Ecodiesel and the 6.4 Powerstroke would like a word.
@@jellyfrosh9102 I’m not either one of those engines my engine is 5.9 Cummins, which I own
If they were the worse engine you wouldn’t have people that love them and that are getting 500,000 miles from them. A guy on the lb7 group hit 1 million miles on his truck.
@@michaelkraemer8965 he is one of only a handful that has hit that mileage 7.3 Ford power stroke and the Cummins do it every day
Dang that’s crazy for a diesel to do that.
Isuzu motor boys
China lol
Made in Ohio since 2000, the introduction of the 1st dmax lb7.
Isuzu is Japanese, but there are flaws in every manufacturer… nothing is perfect