A Long Term Source for M113 APC Spares, Components & Kits

M113 Components and Conversion Kits Expertise

·  Government contracts
Over the last 35 years NAPCO has won major contracts with the Department of Defense for the supply of major assemblies or kits of the M113, M113A1, M113A2 and M113A3.  Assemblies included transfer gear cases, dieselization kits, modernization kits, final drives, instrument panels, steering differentials, fan drive assemblies and pumps.

·  Original Equipment Manufacturer (OEM) contracts
NAPCO manufactures M113A2 and M113A3 components and kits for many OEM's in the .  Most conversion kits are being used in current Government upgrade programs.

·  International contracts
NAPCO has also won major contracts for the supply of M113A1 and M113A2 conversion kits to Armed Forces around the World.

M113A1 Conversion Kits

• Dieselization Kit
  US Ordnance No. 12253148
  NSN 2815-01-046-4321
  The Dieselization Kit replaces the 209 Hp Chrysler Model 75M gasoline engine of the original M113 with the highly reliable Detroit Diesel 6V53 engine rated at 212 Hp.  The package also replaces the transmission, transfer gear case, radiator and alternator with properly sized units.
  
• Modernization Kit
  US Ordnance No. 12253149
  NSN 2815-01-046-4317
  The technical data package developed for the conversion of the original M113 includes many modifications designed to improve the performance, maintainability, safety, and reliability of the M113A1.  These improvements are not related to the dieselization but can easily be installed during the dieselization and rebuild of the vehicle.
  

M113A2 Conversion Kits

• Improved Suspension System (ISS) Kit
  Ordnance No. 12268614
  NSN 2530-00-075-3355
  The purpose of the improvement in suspension  is to permit higher cross-country speed and mobility.  This improvement in performance is accomplished by increasing the vertical road wheel travel, which decreases the roughness of the ride.
  The primary component changes to the suspension are the addition of shock absorbers to the right and left second road wheel stations, use of higher strength torsion bars, and raising the rear idlers two inches.  All shock absorbers used in the new system are longer life design.  The road wheel arms are also newly designed.  In addition, the shock absorbers mounting pins on the road wheel arms are removable and can be replaced without replacing the entire road wheel arm.
  
• Improved Cooling System (ICS) Kit
  US  Ordnance No. 12253697
  NSN 2930-01-075-4978
  Improvements in the cooling system are the result of numerous reports of engine problems attributable to to marginal cooling.  To reduce these problems, the cooling system efficiency was increased by relocating the cooling fan and radiator, increasing the radiator capacity and fan speed, and adding a surge tank for more positive deaeration of the coolant.
  By relocating the fan and radiator, two previous drawbacks of the old system were eliminated.  In the new radiator design, the air circulating across the radiator fins is cool outside air rather than heated air from engine compartment components.  The radiator is also relocated to prevent clogging by oil and dirt from the engine compartment.  The new radiator has an increased capacity, and the new surge tank increases the allowable cooling system drawdown.
  
• Dual Air Personnel Heater Kit.
    Ordnance No. 12269140
  NSN 2540-01-086-3103
  One of the spin-offs from the Improved Cooling System (ICS) kit is the Dual-Air Personnel Heater.  A characteristic of the ICS is that a slight vacuum is developed within the crew compartment.  Under certain conditions, when the vehicle is closed, this vacuum can be great enough to draw exhaust fumes from the old single inlet heater back into the crew compartment.  The dual-air inlet heater eliminates this problem by completely separating the combustion gasses from the heated air within the crew compartment.  This new heater is applied during production and overhaul concurrently with the Improved Cooling System.
  

M113A3 Conversion Kits

• Propulsion System Modernization Kit
  US  Ordnance No. 57K0449
  NSN 2590-01-303-5188
  The A3 conversion package contains all the components necessary to install the OEM or US Government supplied 6V53T turbocharged engine and X200-4/4 transmission.   The new hydrostatic steer transmission permits use of a more powerful 275 HP turbocharged Detroit Diesel 6V53T engine, and eliminates the transfer case and controlled differential.  The RISE powertrain package increases fuel economy, acceleration, hill climbing speed and braking capabilities.  This allows the vehicle to maintain speed through corners by accelerating the outer track rather than braking the inner track as on the A2.  The additional horsepower also allows installation of an external armor kit increasing the gross vehicle weight to 31,000 pounds.  This provides mobility comparable to currently fielded vehicles such as the M1 Abrams Main Battle Tank and M2/M3 Bradley Infantry Fighting Vehicles.
  Steering is improved with an automotive-type steering yoke and foot brake arrangement which improves driver control, lessens fatigue and simplifies driver training superior to the A1/A2 steering/braking laterals.  Due to load matching ability and increased steering capability, cross country performance is also improved.
  
• Spall Suppression Liners Kit
    Ordnance No. 57K0448
  NSN 2510-01-303-2968
  Crew survivability is increased by the addition of spall suppression liners.  The inside of the vehicle (sides, roof and rear) are covered with spall suppression liners which limit troop injuries from the effect of overmatching weapons by restricting the spread of spall if a round penetrates the hull. 
  
• External Fuel Tank Kit
  Ordnance No. 57K0455
  NSN 2590-01-303-2969
  External fuel tanks were developed to improve survivability and increase capacity within the M113A1/A2 crew compartment.  Replacing the internal tank with two tanks mounted on the sides of the vehicle's rear ramp provides an additional 16 cubic feet of internal space.  Placement of the exterior fuel tanks also reduces fire hazard to the crew compartment.  The external tanks are bolted to the rear of the vehicle with five bolts.  All fuel line connections are located near the tank hull and interface for easy replacement.  Two tanks and independent valving provide redundancy in the fuel system allowing continued operation when one tank is damaged.  The external fuel tanks increase the vehicle weight by 900 pounds and the length by 17 inches.
  
• Optional Add-on Armor Kit
  A variety of add-on armor kits are available for additional crew protection.