Automobile Diesel Engine Service Technical Service Bulletin Automobile Diesel Engine Service A diesel engine operates differently than a gasoline engine and, therefore, different service and maintenance practices must be followed. In a gasoline engine the combustion process occurs at constant volume. This process is characteristic of the spark ignition, or Otto cycle. The combustion process of the diesel engine occurs at constant pressure. This process is characteristic of the compression ignition or diesel cycle.
Ignition is assisted on cold start-up by means of a glow plug.
The diesel engine operates at higher compression ratios than does the gasoline engine and burns low volatile fuels. Fuel injection is a requirement of the diesel engine since the fuel enters the combustion chamber near the end of the compression stroke. A gasoline engine can run with a carburetor system or injection system. Careful maintenance of the lube, air induction, and fuel systems is a must for diesel engines. This has been recognized in the truck and heavy duty fields over the years.