5063-539L Engine

6V53T Engine for M113A3 APC

The 5063-539L engine is a six-cylinder V6 configuration two-stroke turbocharged diesel engine with 53cid (Cubic Inch Displacement) per cylinder, Model 6V53T. The 6V53T engine has a total displacement of 318 cubic inches and can produce up to 275 brake horsepower.

The 6V53T engine is used in the M113A3 Family of the M113 Armored Vehicle Family. The 5063-539L engine was introduced to the M113A3 Family of Vehicles to replace the original 5063-5393 powerpack improving performance through insulated exhaust system and improved cold starting by using glow plugs. The two-stroke diesel has a maximum speed of 2850 RPM and a small, light package compared to its maximum torque rating.

Engine with Container
NSN: 2815-01-412-2715 (2815014122715) / Part Number: 57K1006
Engine Container
NSN: 8145-01-232-9447 (8145012329447) / Part Number: 11650202

6V53T Engine Features

  • High Reliability
  • Wide Environmental Tolerance
  • Ease of Maintenance
  • High-Torque for Physical Size
  • Multi-Fuel Capable
  • Robust Design
5063-539L Engine 6V53T for M113A3 APC
5063-539L Engine 6V53T for M113A3 APC
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Turbocharged 2-Cycle Diesel Turbocharged 2-Cycle Diesel

On two-cycle diesel engines, normal aspiration refers to the engine having "neutral" air intake boost pressure. As 2-Stroke diesel engines do not have intake valves, a positive pressure must be generated to push the intake air into the cylinder which is provided by a supercharger, but the supercharger is not considered a pressure boost device as the induction of air into the cylinder causes a neutral average pressure in the intake system.

In turbocharged engine models, one or more turbochargers are used to provide positive boosted intake pressures to increase combustion efficiency and power output.

Supercharger NSN: 2930-01-448-7671
Supercharger Part Number: 23516738
5063-539L Engine 6V53T Blower Midi Bypass
5063-539L Engine 6V53T Blower Midi Bypass

Speed Limiting Governor Speed Limiting Governor

5063-539L engines with NSN 2815-01-412-2715 are equipped with a speed-limiting governor. A speed limiting governor reduces the fuel injected into the cylinders once the desired maximum speed is reached. The linkage from governor to injector contains a hydraulic damper piston to reduce the rate of throttle change and protect against speed hunting. The 6V53T is well known to have a mode of failure called "run-away". Run Away occurs when the governor mechanism fails or is incorrectly adjusted. The fuel injectors of the 5063-539L are sprung loaded to maximum fuel. The governor and its linkages must be functional to reduce the fuel to prevent run away where the engine will keep accelerating until the engine fails. The only way to stop run away once it is happening is to shut off the air supply to the engine intake.

Lubrication System Lubrication System

The 5063-539L engine with NSN 2815-01-412-2715 has a rotary oil pump located within a housing on the front of the engine directly driven by the crankshaft. The georotor pump has 1.5" wide pump gears for higher capacity flow and is driven on a spline on the crankshaft. Gerotor pumps use a trochoidal inner rotor and an outer rotor formed by a circle with intersecting circular arcs. A suction tube and screened pickup suck oil from the oil pan. There are two oil pressure regulating valves in the oil pump housing that regulate the engine oil pressure.

Oil Pump NSN: 2815-01-219-4102
Oil Pump Part Number: 5104714
5063-539L Engine 6V53T Oil Pump
5063-539L Engine 6V53T Oil Pump

Cold Starting Aid Cold Starting Aid

The 5063-539L engine with Part Number 5K1006 has electronically controlled glow plugs as a cold starting aid. Power for the glow plug controller is tapped from the starter motor terminals. When the vehicle is switched to Engine Run condition, the glow plug controller is activated. The Glow Plug Controller pulses the glow plugs to heat them whenever the temperature of the engine is cold enough that the glow plugs can assist ignition. When the engine is running and has reached a suitable temperature, the glow plugs are automatically switched off.