This website page provides information for Caterpillar 3054 Engine:
The engine is a diesel engine which is controlled with a mechanically actuated fuel injection pump. The four engine cylinders are arranged in-line.
The engine serial number is located on the left side of the cylinder block.
Note: Always refer to the engine identification number in order to get the correct new parts.
Either a Delphi DP 200 Series fuel injection pump is installed on the engine, or a Stanadyne fuel injection pump is installed on the engine.Both pumps conform to requirements for emissions
The fuel injection pumps have mechanical governors in order to control the engine rpm.
Take a look at this video, to get a view of this engine from all sides.
Source for above engine: "Caterpillar Engine service manual"