- 1). Locate the Detroit Diesel engine ID tag. You will commonly find the ID tag on the valve cover at the top of the engine, or in its vicinity, either to the left or right of it. The ID tag style has changed over the years, but the information found on it essentially remains the same.
- 2). Find the engine model number on the ID tag. According to the Wisconsin Bureau of transportation identification guide, the ID tag contains the model designation, the unit production serial number and the model year, as well as other information. You will find the Detroit diesel engine model under the engine series heading, usually above the unit serial number.
- 3). Determine the year of production. You will normally find the year of production on the upper right hand corner of the engine ID tag.
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