Power Units Up To Serial Number 185199

1. This first letter designates the engine. M-Engine
2. This number designates the series. 4-135 or 152
3. This number designates the fuel type of the engine. 1-Gasoline, 2-LP Gas, 3-Diesel
4. This letter designates the using factory. N-Des Moines Works
5. This letter designates the engine variation and application.A-Initial Design, B-First Variation, C-Second Variation
6. These six (6) digits designate the power unit serial number.
7. This letter designates the manufacturer of the power unit. T-John Deere Dubuque Works

1. This number designates the number of cylinders. 3-Three Cylinder
2. These numbers designate the cubic inch displacement. 152-153 Cubic Inch (2212 CM3)
3. This letter designates the fuel type of the engine. D-Diesel, G-Gasoline
4. This letter designates the using factory. N-Des Moines Works
5. These numbers designate the engine version. 01-Initial Design, 02-First Variation
6. These six (6) numbers designate the portion of the power unit serial number shown in the serial number.

In addition to the serial number plate, OEM engines have an engine option code label affixed to the rocker arm cover. These codes indicate which of the engine options were installed on your engine at the factory. The first two digits of each code identify a specific group, such as an alternator. The two last digits of each code identify one specific option provided on your engine, such as a 12 volt, 55 ampere alternator. If an engine is ordered without a particular component, the last two digits of that functional Group option code will be 9.