Maybe this is old news, but I have not heard it before.
A visit with one of my salesman friends (yes some of them are) who sells both Ford and GM revealed an interesting story.
He says that their GM dealership in a town of 25,000 has had two lower end failures in Duramaxes they sold. He said that they were rod failures.
In another conversation with a class 8 (Peterbilt) salesman, he said that his information on the problem from a commercial operator in Denver is that the problem with the bottom ends of some of the early Duramaxes is that the initial production model had CAST, yes CAST crankshafts instead of forged cranks. This commercial operator had two failures in their fleet of wreckers. It was believed that the failure happens when changing from pulling hard to coasting, due to a torque spike reversal.
In all cases, GM immediately (in one case air freighted) new engines for the dealers to install.
The further rumor is that the current production engine has a forged crank.
If this is true, it looks like the GM bean counters struck again.
Harry
A visit with one of my salesman friends (yes some of them are) who sells both Ford and GM revealed an interesting story.
He says that their GM dealership in a town of 25,000 has had two lower end failures in Duramaxes they sold. He said that they were rod failures.
In another conversation with a class 8 (Peterbilt) salesman, he said that his information on the problem from a commercial operator in Denver is that the problem with the bottom ends of some of the early Duramaxes is that the initial production model had CAST, yes CAST crankshafts instead of forged cranks. This commercial operator had two failures in their fleet of wreckers. It was believed that the failure happens when changing from pulling hard to coasting, due to a torque spike reversal.
In all cases, GM immediately (in one case air freighted) new engines for the dealers to install.
The further rumor is that the current production engine has a forged crank.
If this is true, it looks like the GM bean counters struck again.
Harry