TM-9-2815-205-24

FIELD MAINTENANCE

EQUIPMENT DESCRIPTION AND DATA

EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES

The Series 6V53/6V53T Diesel Engine is a two cycle, fuel injected, V-type, liquid cooled, six cylinder diesel

engine with water cooled cylinder liners. Cylinders are numbered one, two, and three on left and right starting

from the front of the engine. Terms “right", “left", “front", and “rear" are defined as viewed from the rear or flywheel

end of the engine.

The 6V53/6V53T Diesel Engine is an internal combustion power unit where the heat energy of the fuel is

converted into work energy inside the cylinder. This particular engine has a two stroke cycle. A two stroke engine

completes one cycle (intake, compression, power, and exhaust) every time the piston goes up and down - up

being one stroke and down being the return stroke. The air intake and exhaust functions are accomplished during

the compression and power strokes.

The engine has a blower to force air into the chambers for both intake and exhaust functions. In addition, all

models except 5063-5299 have a turbocharger to pressurize air (called supercharging) to increase airflow and

allow higher fuel input. When the piston is halfway down, the exhaust valves open. Shortly thereafter, the piston

drops below a row of inlet ports in the cylinder liner wall. Pressurized air is then forced through the cylinder.

During this process, all of the exhaust gases are removed (or scavenged) from the cylinder. When the exhaust

valves close, during the piston's upward stroke, fresh air is trapped in the cylinder and compressed.

Injection of fuel into the cylinder begins with the piston near its highest point and continues into the power stroke.

The intense heat created by the high compression of air immediately ignites the fine fuel spray. This combustion

continues until all the injected fuel is burned. The resulting pressure forces the piston downward on its power

stroke. When the piston is about halfway down, the exhaust valves open. Shortly thereafter, the piston drops

below the ports, and the cylinder is again swept with clean scavenging air. This entire combustion cycle is

completed in each cylinder for each revolution of the crankshaft.

The engine serial number is stamped on the right side, upper front corner of cylinder block in front of the cylinder

head. An option label is affixed to one valve rocker arm cover which carries the engine serial number, model

number, tune-up specifications, and list of optional equipment used on the engine.

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