In addition to producing industrial and agricultural machinery, Minsk Motor Plant produces a variety of internal combustion engines for buses. In 1992, MMZ introduced the 6-cylinder diesel D-260, which had an in-line cast iron cylinder block with wet cast iron liners and oil nozzles for piston cooling. Engineers installed steel connecting rods, aluminum pistons with a diameter of 110 mm, and a steel crankshaft with a piston stroke of 125 mm (main journal diameter 85.25 mm, connecting rod journals 73 mm) in this block. With all of this, a working volume of 7.12 liters is achievable.
A cast-iron head with twelve valves and inserted valve seats covers the cylinder block. The cylinder head does not have a camshaft; instead, it stands in the block and acts on the valves using pushers, rods, and rocker arms. The intake and exhaust valves measure 48 and 42 mm, respectively, and the stem is 11 mm thick. The D-260 valves must be adjusted as necessary, but every 500 hours of operation, the clearances must be examined. The inlet and outlet valve clearances should be 0.25 mm and 0.45 mm, respectively. The internal combustion engine operates in the same order that the valves are adjusted: 1-5-3-6-2-4. 2.8–4.5 kgf/cm of oil pressure
The D-260 diesel has a TKR 7 turbocharger and a YAZDA 363 fuel pump. Production of a version for the Euro-1 standard started in 1998, and the D-260 diesel was added to the Euro-2 standard in 2001. Euro-3 motors, which debuted on the conveyor in 2005 and were identified by the use of Common rail injection with a Bosch CPN2.2 fuel pump and a Bosch EDC7UC31 ECU, came next.
Specifications
| 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
Diesel engines are used in locations where air exchange is unrestricted. Diesel engines are made to run in ambient temperatures between +40°C and -45°C. 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 are powered by diesel D-260.1 and its modifications. Diesel engines are built to last for a long time without requiring significant repairs, provided that proper maintenance, storage, and operation are followed.
There are numerous functional components, assemblies, and systems in this model’s power unit. Primary roles:
- 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. |