Engine break-in after repair

The overhauled engine is bench tested (running-in) without load for 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 minutes.

Having installed on the stand and started the engine, check: if there is any leakage of coolant or fuel between mating parts, from pipeline connections and through gaskets; is there any oil leakage from under the oil filter sealing ring; oil pressure; setting the ignition moment; idle speed; there are no extraneous knocks.

If extraneous knocks or malfunctions are found, 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 sump, cylinder block and covers, tighten the mounting bolts to the recommended torque. If oil leakage does not stop, check the quality of the gaskets and replace them if necessary.

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

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