4-cycle gas engine 7GMG (8GChN26/26) rated 860 kW is a modification of D49 engine intended for power generation at power stations of all types.

This engine is spark-ignited and uses natural or associate gas as fuel.

Cooling system is 2-circuit system with charge air cooling. The engine can be supplied with exhaust heat recovery system.

Technical characteristics
Parameter Value
Rated power, kW 860
Engine speed, min-1/ Hz 1000/50
Voltage, kV 6,3/10,5
Gas fuel type Natural gas according to GOST 27577
Fuel consumption at rated power, max., m3/ч 285
Brake specific gas consumption at rated power, m3 / kW∙h 0,330
Burning oil consumption at rated power, kg/h 0,75
Overall dimensions (generator included) (LхBхH), mm 5570х1950х2910
Major overhaul interval, years 18
Weight (generator included), kg 19 500
Top end overhaul/major overhaul intervals, h 20 000/80 000
Turbocharger availability (model) yes
Heat taken away with exhaust gas at rated power, кJ/h 267,1х104
Heat, taken away through cooling system at rated power, кJ/h 259,3х104
Rated pressure of gas fuel, MPа 0,18-0,3
Ignition system Spark-ignited system
Cooling system 2-circuit system
Starting system Pneumatic system or electric starter
Oils used М14V2, М14G2
Design features
  • parts standardization up to 80%;
  • reliability and wear resistance of parts and assembly units;
  • modular design providing high maintainability,
  • components being interchangeable during the whole service life;
  • low cost of maintenance and oil used;
  • long operation life;
  • engine is easily aligned with generator by means of flange connections and plate coupling resulting in lower vibrations of the whole set;
  • cylinder block of dry type (no contact with cooling water and, as a result, no corrosion).