Table 3.4. Engine break-in cycle
| Crankshaft speed, min⁻¹ | Running-in time at a given rotation speed, min |
| 750-800 | 1 |
| 1000 | 3 |
| 1500 | 4 |
| 2000 | 5 |
After installing the engine on the stand and starting it, check:
- no leakage of coolant or fuel between mating parts and in pipeline connections;
- oil pressure and no oil leaks through the gaskets;
- idle speed;
- tightness of connections of power supply system elements (air and fuel supply systems).
If any unusual knocking or malfunctions are detected, stop the engine, eliminate them, and then continue testing.
If oil leaks through the gasket between the oil pan and the cylinder block, tighten the mounting bolts to the recommended torque. If the leak does not stop, check the gasket and replace it if necessary.
If oil leaks through the gasket between the cover and the cylinder head, check the gasket and the rubber bushings on the cylinder head cover mounting studs. If necessary, replace the gasket and bushings, following the recommendations given in the subsection "Engine assembly".
After engine repair, it is necessary to observe a certain operating mode during the period of running-in of the working surfaces of new parts. This especially applies to those engines on which pistons, connecting rod and main bearing liners have been replaced, crankshaft journals have been reground, and cylinders have been honed or cylinder liners have been replaced.
Therefore, during the running-in of the repaired engine on the vehicle, do not subject it to maximum loads. The engine running-in should be carried out in compliance with the speeds and loads recommended for the vehicle running-in period.