The EGR system is used on all vehicles for the purpose of reducing nitrogen oxide emissions. The amount of exhaust flow through the EGR is directly proportionate to the cubic inch displacement and compression ratio.
Heavy-duty trucks such as 10-wheel tractors using large displacement engines and running in all climatic zones and altitudes use more sophisticated computers. It’s necessary to determine the amount of exhaust flow into the cylinders necessary to maintain satisfactory emissions under all conditions of load and atmosphere.
Diesel engine design concentrates on torque more than horsepower. And their service life is far superior to that of a gas engine due to the lubricating properties of their fuel, the heavier construction and very high oil pressure. They also have the advantage in fuel economy.
On the flip side, diesel engines run very “dirty” requiring more service than a gasoline engine. Dirty relating to the amount of soot produced. This soot in the exhaust is re-burned in the engine through the EGR system. Due to the high-compression soot contaminates the oil and requires more frequent oil changes.
The type of oil used is another major factor. It must be designed for diesels. Oil changes should be accomplished every 3000 miles or close.
The EGR and oil cooler must be checked for leaks or clogging on a regular basis. If either begins to clog the engine temperature will begin to rise. If this happens it’s indicative of the clogged cooler. This is a repair that must be done as soon as possible. If ignored, you could quickly be looking at a bill sufficient to make your cheese slide off your cracker. EGR coolers
have been a problem on diesels for some time and require an after-market solution to correct. The new coolers have aluminum tubing rather than radiator cores and will last much longer and are trouble free.