See Figures 1 through 5
The engine can be identified by a letter or pair of letters preceding the serial number. Engine specifications are listed according to the letter code and model year.
On all Type 1 models, and on 1970-71 Type 2/1600 models using the upright fan engine, the engine number is stamped into the crankcase flange for the generator support. The number can readily be seen by looking through the center of the fan belt.
On all Type 3 and 4 models, and on 1972-79 Type 2/1700, Type 2/1800, and Type 2/2000 models using the "suitcase" engine, the engine number is stamped into the crankcase along the crankcase joint near the oil breather. On the 1980-81 Type 2 (Vanagon) the engine number is located on the right side of the engine compartment, directly in front of the fan housing.