ENGINE MMZ D-260

Minsk Motor Plant (MMZ) deals with manufacture of various internal combustion engines for buses, as well as industrial and agricultural machinery. The 6-cylinder diesel engine D-260 from MMZ was released in 1995 and was equipped with an in-line cast-iron cylinder block with cast-iron wet sleeves and with oil nozzles for cooling the pistons. In this block, engineers placed a steel crankshaft with a piston stroke of 125 mm (the diameter of the main necks is 85.25 mm, the connecting rod necks 73 mm), steel connecting rods and aluminum pistons with a diameter of 110 mm. All this allows you to get a working volume of 7.12 liters.

The cylinder block is covered with a cast-iron head with 12 valves and with plug-in valve seats. There is no camshaft in the cylinder head – it stands in the block and acts on the valves by means of pushers, rods and rocker arms. The size of the intake valves is 48 mm, exhaust 42 mm, the thickness of the stem 11 mm. Adjustment of D-260 valves is required as needed, but clearances must be checked after every 500 hours of operation. Valve clearances should be as follows: inlet – 0.25 mm, outlet – 0.45 mm. The procedure for adjusting the valves is the same as the operation sequence of the internal combustion engine – 1-5-3-6-2-4. Oil pressure – 2.8-4.5 kgf / cm2.

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

Here you can order GENMOT crankshafts for popular models of D-260 engines. More details YOU CAN FIND in the catalog.

The structure of D260 engine

The scope of diesel engines is places with unlimited air exchange. Diesel engines are designed for operation at an ambient temperature of plus 40 C to minus 45 C. The D-260.1 diesel engine and its modifications are used as a power unit on energy-saturated wheeled tractors (D-260.1 and D-260.2), tracked tractors (D-260.14) , forage harvesters (D-260.4), energy-saturated energy means 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, components and systems. The main positions

• Cylinder block;
• Cylinder head, 2 pcs.;
• crank gear;
• valve operating mechanism;
• fuel system;
• turbocharge;
• cooling system;
• lubricant system.

1 – oil sump; 2 – oil pump; 3 – damper; 4 – crankshaft pulley; 5 – fan belt; 6 – distribution cover; 7 – tension pulley; 8 – piston cooling jet; 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 – camshaft.

D-260 modifications and their differences