Table 5.2. Block parameters
Engine | N62B44 | N62B48 |
Piston-cylinder clearance, mm | ||
- nominal | 0,03 | |
- maximum allowable | 0,10 | |
Cylinder diameter, mm | ||
- nominal | 92,00 | 93,00 |
– 1st repair size | 92,25 | 93,25 |
– 2nd repair size | 92,50 | 93,50 |
Permissible ovality of cylinder mirrors, mm | 0,007 | |
Permissible taper of cylinder mirrors, mm | 0,01 | |
Execution tolerance, mm | +0,014 |
The cylinder block is light alloy, with dry thin-walled cast iron liners that can be repaired (boring). The sleeves are installed during the block casting process and cannot be replaced. The location of the cylinder blocks is V-shaped, at an angle of 90°. Bottom Block (crankcase) made five nests-supports for liners of main bearings of the crankshaft. The main bearing caps are finished with the block, so they are not interchangeable.
In case of slight wear or damage, the cylinder mirror can be restored by grinding and honing, in the conditions of service stations, with the subsequent installation of pistons of intermediate or repair sizes.
The diameter of the cylinders is measured by an inside gauge in three zones, in mutually perpendicular directions, at a distance of 10 mm from the upper and lower edges and in the center of the cylinder.