Crankshaft
The crankshaft is five-bearing, with five counterweights. It is possible to regrind the crankshaft journals during repairs with a diameter reduction of 0.25; 0.50 and 0.75 mm.
Main journals diameter, mm:
- nominal: 49.938-49.956;
- maximum allowable (when worn): 49,890.
Diameter of connecting rod journals, mm:
- engines B3 and B5;
- nominal: 39.940-39.956;
- maximum allowable (when worn): 39,89;
- B6 and B6 EGI engines:
- nominal: 44.940-44.956;
- maximum allowable (when worn): 44,89.
Ovality and taper of the surfaces of the main and connecting rod journals, not more than, mm: 0.05.
Non-straightness of the main and connecting rod journals, no more than, mm: 0.04.
Pistons
The pistons are cast aluminum alloy and have three piston rings.
The piston pin is pressed into the upper head of the connecting rod and rotates freely in the piston bosses. From axial movement, the pin is fixed by locking rings.
Piston characteristics
Piston rings
Piston ring specifications
* The values in brackets are for the B3 engine.
Piston pins
Engines B3, B5 and B6:
Outer diameter, mm: 19.974-19.980.
Preload between the pin and the upper head of the connecting rod, mm:
- engines B3 and B5: 0.013-0.037;
- engine B6: 0.013-0.032.
Pressing force, kgf·m: 500-1500.
B6 EGI engine:
Outer diameter, mm: 19.987-19.993.
Preload between the pin and the piston boss, mm: 0.010-0.027.
Connecting rods
Connecting rod - steel, forged, with an I-section rod and with a straight section lower head cover.
Distance between the axes of the holes of the heads, mm:
- engines B3 and B5: 135.95-136.05;
- B6 engine: 132.85-132.95.
The maximum allowable buckling of the connecting rod, mm: 0.04.
Connecting rod upper head hole diameter, mm:
- engines B3 and B5: 19.945-19.961;
- B6 engine: 19.948-19.961.
Connecting rod bottom hole diameter, mm:
- engines B3 and B5: 43.000-43.016;
- B6 engine: 48.000-48.016.
Width of the lower head of the connecting rod, mm: 21.838-21.890.
Gap between connecting rod and piston, mm:
- nominal: 0.110-0.262;
- maximum allowable (when worn): 0,30.