Engine MMZ D-260

Engine MMZ D-260

Minsk Motor Plant manufactures various internal combustion engines for buses, as well as industrial and agricultural machinery. The 6-cylinder diesel D-260 from MMZ was released in 1992 and was equipped with an in-line cast iron cylinder block with wet cast iron liners and oil nozzles for piston cooling. In this block, engineers placed a steel crankshaft with a piston stroke of 125 mm (main journal diameter 85.25 mm, connecting rod journals 73 mm), steel connecting rods and aluminum pistons with a diameter of 110 mm. All this makes it possible to obtain a working volume of 7.12 liters.

The cylinder block is covered by a cast-iron head with 12 valves and inserted valve seats. There is no camshaft in the cylinder head – it stands in the block and, by means of pushers, rods and rocker arms, acts on the valves. The size of the intake valves is 48 mm, the exhaust valves are 42 mm, the thickness of the stem is 11 mm. Adjustment of the D-260 valves is required as needed, but the clearances need to be checked after every 500 hours of operation. The valve clearances should be as follows: inlet – 0.25 mm, outlet – 0.45 mm. The order of adjusting the valves is the same as the sequence of operation of the internal combustion engine – 1-5-3-6-2-4. Oil pressure – 2.8-4.5 kgf / cm 2 .

The D-260 diesel is equipped with a YAZDA 363 fuel pump and a TKR 7 turbocharger. Since 1998, the production of a version for the Euro-1 standard began, and in 2001 the D-260 diesel was brought to Euro-2. This was followed by Euro-3 motors, which entered the conveyor in 2005 and were distinguished by the presence of Common rail injection with a Bosch CPN2.2 fuel pump and a Bosch EDC7UC31 ECU.


Displacement 7,12 liters
Cylinder bore 110 mm
Piston stroke 125 mm
Firing order 1-5-3-6-2-4
Power output 155 hp
RPM 2100 rpm
RPM (idling) 850 – 2260 rpm
Torque output (max) 622 Nm
Compression ratio 16
Weight 710 kg
Dimensions 130×70,5×111,8 cm

Engine device D260

The area of ​​application of diesel engines is places with unlimited air exchange. Diesels are designed for operation at ambient temperatures from plus 40 C to minus 45 C. Diesel D-260.1 and its modifications are used as a power unit on high-energy wheeled tractors (D-260.1 and D-260.2), tracked tractors (D-260.14) , forage harvesters (D-260.4), energy-rich energy devices UES-250 (D-260.7) and other machines for various purposes. The design of diesel engines is designed for long-term operation without major repairs, subject to the rules of operation, storage and timely maintenance.

The power unit of this model includes a large number of working parts, assemblies and systems. Main positions:

  • block of cylinders;
  • cylinder head block heads 2 pieces;
  • crank mechanism;
  • gas distribution mechanism;
  • fuel system;
  • turbocharger;
  • cooling system;
  • lubrication system.

1 – oil sump; 2 – oil pump; 3 – damper; 4 – crankshaft pulley; 5 – fan belt; 6 – distribution cover; 7 – tension pulley; 8 – piston cooling nozzle; 9 – fan; 10 – water pump; 11 – thermostat housing; 12 – connecting rod; 13 – piston; 14 – cylinder liner; 15 – cap; 16 cylinder head cover; 17 – cylinder head; 18 – cylinder block; 19 – back sheet; 20 – flywheel; 21 – crankshaft; 22 – oil receiver; 23 – a camshaft.

D-260 modifications and their differences

D-260.1 – basic modification with TKR-7N3 (Euro-1), TKR-700-4 (Euro-2) without intercooler with 155 hp output at 2100 rpm, and the torque is 622 Nm at 1400 rpm.
D-260.2 – analogue of D260.1 without 130 hp intercooler at 2100 rpm, torque 500 Nm at 1400 rpm.
D-260.4 – combine engine with turbine TKR 700-2-12M with intercooler and 209 hp at 2100 rpm, torque 808 Nm at 1500 rpm.
D-260.5 – a motor with an intercooler for vehicles weighing up to 32 tons. Its power is 230 hp. at 2100 rpm, torque 883 Nm at 1300-1600 rpm.
D-260.6 – diesel for combines and tractors with a capacity of 206 hp at 2100 rpm, torque 1000 Nm at 1500 rpm.
D-260.7 – combine engine based on 260.1 with a different intake and exhaust manifolds, with an NSh-25 pump, a modified internal combustion engine support, with its own oil supply and oil drain from the turbine. There is a TKR 700-2-12M turbocharger with an intercooler and developing 250 hp. at 2100 rpm, torque 961 Nm at 1500 rpm.
D-260.8 – version without intercooler for 102 hp at 1800 rpm, torque 497 Nm at 1500 rpm.
D-260.9 – combine engine with intercooler and turbocharger 700-2-12 The engine was created on the basis of 260.1 and is distinguished by the NSh-32 pump. Its power is 180 hp. at 2100 rpm, torque 690 Nm at 1500 rpm.
D-260.11 – car engine 185 hp at 2100 rpm, torque 745 Nm at 1500 rpm.
D-260.12 – motor for trucks weighing up to 36 tons develops a power of 250 hp. at 2100 rpm and a torque of 970 Nm at 1500 rpm.
D-260.13 – automobile internal combustion engine 204 hp at 2100 rpm, torque 768 Nm at 1300-1575 rpm.
D-260.14 – diesel for tracked tractors with intercooler 140 hp at 1800 rpm, the moment is 682 Nm at 1300-1450 rpm. The motor is based on the 260.1 and has a starter, alternator and pump drive.
D-260.16 – engine with intercooler 280 hp at 2100 rpm, torque 1124 Nm at 1500 rpm.

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