Kohler KDI 1903 TCR

Kohler KDI 1903 TCR

With advanced features like the common rail, 4-valve head, turbocharger, electronic cooled EGR, turbocharger, oil control system and diesel-oxygenated catalyst (DOC). KOHLER Diesel KDI common rail engines do not have a DPF - lowering operating costs and maintenance. Discover the long-lasting performance of Kohler Diesel KDI.

Engines are Tier 4 Final emission compliant without the use of a Diesel Particulate Filter (DPF) The components of the engines that work together to achieve Tier 4 Final emission compliance:

  • Direct injection system utilizing pressures at 2000 bar (29,000 PSI)
  • The Electronic Control Unit (ECU), with fuel mapping program to monitor and manage the engine's power output
  • Efficient turbocharger
  • 4 valve cylinder head with special combustion chamber design
  • Cooled, electronic exhaust gas recirculation (EGR)
  • Diesel oxygenated catalyst (DOC) Without a DPF, the engines have:
  • Low cost of ownership
  • Limited maintenance
  • Compact sizing for equipment manufacturers
  • No heat management issues

Direct injection system saves more than $1,400 on fuel and $116 on oil per year when compared to indirect injection diesel engines with diesel particulate filters. Based on 1,000 hours of annual operation at $3.75/gallon of diesel fuel and $4.10/quart of oil.

Kohler KDI1903 Technical Drawing

Model Diesel KDI1903TCR
J1940 Power hp(kW)1 56 (42)
Displacement cu in (cc) 113.5 (1861)
Bore in (mm) 3.5 (88)
Stroke in (mm) 4 (102)
Peak Torque lbs. ft (Nm) 165.9 (225)
Compression Ratio NA
Dry Weight lbs (kg) 512.6 (233)
Oil Capacity U.S. quarts (L) 8.9 (8.5)
Lubrication Full Pressure
Dimensions L x W x H in 23.5 x 20.5 x 28.18

Kohler KDI 1903 Tcr Front


User-Friendly Maintenance.

  • No DPF service
  • One side service
  • 500 hour oil change intervals

High Power Performance.

  • Turbocharger
  • High-pressure common rail (2000 bar)
  • 4 valves per cylinder
  • Up to 300 Nm of torque at 1500 rpm

Increased Efficiency.

  • Advanced common rail direct injection system
  • No Diesel Particulate Filter (DPF)
  • Close-circuit crankcase breather

Quiet, Smooth Operation.

  • Hydraulic valve lifters
  • Controlled combustion with multiple injections per cycle
  • Straight tooth gear reduced pitch
  • Liquid-cooled

Reliability and Long Life Design.

  • Cast iron crankcase with vibration-absorbing bed plate



Assembly line




Kohler ECU The engine electronic control unit (ECU), together with the common rail injection system, is a part of the most advanced automotive style engine management system and has been specifically developed for industrial and construction equipment applications. It allows a full control of the engine calibration parameters to achieve the engine performances and emissions targets. A CAN bus link allows the ECU to interface with other electronic systems within the final application in order to optimize the engines operating parameters. Options of specific functionalities have been enabled within the ECU in order to provide OEMs with different governing characteristics ensuring total compatibility with individual equipment.


Kohler EGR Cooler The Exhaust Gas Recirculation (EGR) system has been designed with CFD analysis and the use of comprehensive research and development resources. The chosen design of a "hot side" EGR layout will avoid valve sticking problems that are historically the most common failures seen within these systems. Exhaust gas routing across the cylinder head ensures a beneficial preliminary gas cooling before entering the EGR valve to reduce the overall dimensions of the unit to assist installation parameters.

Common Rail

Kohler Common Rail Common-rail System Kohler has selected the most advanced common-rail system available on the market and specifically engineered for extreme durability and longevity within arduous industrial and construction equipment applications. The 2000 bar high pressure pump, together with the advanced multiple-injection control of the solenoid-injectors, allows an excellent fuel rate control during the injection process.


Kohler Turbo Turbocharger and charge-air cooler The waste-gated turbocharger has been specifically tuned to minimize the turbo-lag response and provide the precise volume of air for an excellent low end torque capability. The special design of the lubrication system guarantees extended durability of the turbocharger. The use of a charge air cooler is required to ensure the correct air inlet temperature for the optimal engine performance whilst achieving emissions compliance.