Chevy Diesel Engines
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Chevy has used diesel engines since the 80’s. Some of the first diesel engines were the 6.2 liter V8 commonly known as Detroit Diesel. This engine later was the engine of choice for Suburban’s being built for Europe. The 6.2 liter was replaced by the 6.5 liter non-turbo diesel engine. The designation was LB7 and started in 2001. It is a 32-valve with high=pressure common-rail direct injection. That spelled big trouble as the injectors caused major issues. The turbocharged version shared the same problem. After some time, GM extended the warranty on the injectors for 7 years or 200,000 miles. The LLY 6.5 liter turbo diesel was the same design but had aluminum heads instead of a composite type. The valve covers were re-designed to easy the issue of replacing the injectors in case of failure.
Starting in 2006 the LLY code 2 was made for only 2 years. This engine was much more reliable even though they were the same design as the earlier version. The computer was tuned to offer more horsepower and the only transmission offered in an automatic was the Allison 6-speed. The piston were changed to lower compression and the fuel injectors sprayed directly on the glow plugs giving a fast and more reliable start up. This also reduced emissions.
The LLM 6.6 liter was the only Duramax offered from 208-2010. So far it has been very reliable with 16:8:1 compression and the updated CP3 injector pump. This motor produces 365 horsepower and a whopping 660 lb-ft of torque. The LML 6.6 liter is the latest Duramax being used in trucks. It is still the Isuzu-GM Duramax build but has much better emissions and internal improvements. The piston oil flow design has helped even more with temperature control along with the oil pump design.