Engine running-in after repair (VAZ-2105)

The repaired engine undergoes bench testing (running-in) without load according to the following cycle: at a speed of 820–900 min⁻¹ — 2 min, 1000 min⁻¹ — 3 min, 1500 min⁻¹ — 4 min, 2000 min⁻¹ — 5 min.

After installing the engine on the stand and starting it, check for coolant or fuel leaks between mating parts, from pipe connections and through gaskets; is there any oil leakage from under the oil filter sealing ring?; oil pressure; setting the ignition timing; idle speed; are there any extraneous knocks?.

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 cover and the cylinder head or through the gaskets between the engine oil pan, cylinder block and covers, tighten the mounting bolts to the recommended torque. If the oil leak does not stop, check the quality of the gaskets and replace them if necessary.

Since the engine has not yet been run in after repair and the friction of the working surfaces of the new parts provides significant resistance to rotation, a certain period of running in is necessary. This applies in particular to those engines on which the pistons, connecting rod and main bearings have been replaced, the crankshaft journals have been reground, and the cylinders have been honed.

Therefore, during the running-in of a repaired engine, its operation should not be brought to maximum mode and the running-in of the engine should continue on the vehicle, observing the driving speeds that are recommended for a new vehicle.

The material is posted on the online resource [www.VAZbook.ru]