The earlier models, the M113A1 and A2 configurations, have powerpacks
consisting of a 6V53 engine, transfer gearcase, and Allison TX 100-1
transmission.
This powerpack configuration transmits engine power
through the transfer gearcase, to the transmission, and then to the
steering control differential. Finally, the power is transferred to
the final drives by drive shafts extending from the steering control
differential.
Figure 1-7 illustrates the power flow for the M113A2
configuration.
During this portion of the subcourse, you learned the difference
between the powerpacks used on previous models of the M113 family of
APCs and the powerpack used in the M113A3 model.
2.
The Engine Assembly.
The engine assembly used in the M113A3 APC is a six-cylinder, V-type,
turbocharged, two-cycle diesel, Series 6V53T Detroit Diesel Engine,
model 5063-5392.
The engine develops 275 horsepower (hp) at 2800
revolutions per minute (rpm).
The A1 and A2 configuration of the M113 family of carriers uses the
6V53 series engine, model 5063-5299; however, the 6V53 engine is not
turbocharged like the 6V53T series engine. The 6V53 engine developed
212 hp at 2800 rpm. An increase in engine horsepower was necessary
due to the additional weight of the M113A3 carrier.
The major
differences between the 6V53 and the 6V53T engines are as follows:
a. Block Material.
The cast iron block 6V53 or 6V53T engines
have main bearing stabilizers.
The aluminum block 6V53T engine has
main bearing supports.
b. Turbocharger, Compression Ratio, and Horsepower.
The 6V53T
engine, model 5063-5392, is turbocharged (T in 6V53T designates
turbocharged), has a nominal compression ratio of 18 to 1, and is
rated at 275 hp.
The 6V53 engine, model 5063-5299, is not
turbocharged, has a compression ratio of 21 to 1, and is rated at 210
hp.
The turbocharger mounts at the top rear of the engine
compartment.
c. Fuel Injectors.
The 6V53 engine uses N50 fuel injectors,
while the 6V53T uses 5C55 fuel injectors.
d. Oil Cooler. The 6V53 engine has a three-element cooler while
the 6V53T engine has a two-element cooler.
e. Air Inlet Housing. The air inlet housing on the 6V53 engine
is round; it is oval on the 6V53T engine.
8
OD1712
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