Measuring with a scale the width of a calibrated wire after flattening
1 - calibrated wire; 2 - insert; 3 - connecting rod bearing cover; 4 - scale for calibrated wire
The gap between the liners and the crankshaft journal can be checked by calculation, by measuring the details, or by a calibrated plastic wire for which:
- thoroughly clean the working surface of the liners and the connecting rod journal and install the connecting rod - piston group on the crankshaft journal according to the numbering;
- place a piece of gauge wire on the surface of the connecting rod, install the cover on the connecting rod and tighten the nuts to a torque of 51 Nm (5.2 kgf·m);
- remove the cover and, using the scale printed on the package, determine the size of the gap by the flattening of the wire.
The nominal design gap is 0.036–0.086 mm. If it is less than the limit (0.1 mm), you can use these earbuds again.
If the gap is greater than the limit, replace the liners on these necks with new ones. If the crankshaft journals are worn out and ground to a repair size, then replace the liners with repair ones of increased thickness.
Thickness of shells of connecting rod bearings, mm
Rated | enlarged (repair) | |||
0,25 | 0,50 | 0,75 | 1,0 | |
1,723 | 1,848 | 1,973 | 2,098 | 2,223 |
1,730 | 1,855 | 1,980 | 2,105 | 2,230 |
Numbers 0.25; 0.50, etc. indicate the amount of reduction in the diameter of the crankshaft journals after grinding.