Determination of the quality of rapid engine break-in by changing the crankcase gas flow rate, oil pressure and temperature
Stabilization of the crankcase gas flow rate and its reduction in comparison with the corresponding engine break -in mode on pure oil serve as indicators of the effectiveness of the additive for running-in. In addition, in the process of engine break-in there is a decrease in oil pressure. Reducing the rate of pressure drop and oil temperature in the engine lubrication system characterizes the quality of run-in. The use of various oils with pre-processing compositions containing surface-active agents (SAA) and chemically active substances (CAS), accelerate the process of break-in and improve its quality and reduce repair costs in general. Internal combustion engines of the UMZ-421 brand were studied, speed run-in of which was carried out at the run-in section of OJSC «Ulyanovsk automobile repair plant № 2» and in the internal combustion engine testing laboratory of the Ulyanovsk SAU. It is established that the efficiency of additives and oils in relation to M-8-B oil is distributed as follows during speed-up run-in: ОМД-8; М-8-В SINTEC + 3 % ВАРКС; М-8-В SINTEC + 2 % ОГМ-3 respectively in 3,52; 3,25; 3,07 times. According to the results of the research, it was concluded that the use of fast run-in on various pre-production compositions M-8-in SINTEC (GOST17479.1-85) + 2 % OGM-3; M-8 - in SINTEC (GOST 17479.1-85) + 3% VARS; OMD-8 reduces the volume of crankcase gases released up to 3.5 times, reduces the pressure drop in the engine lubrication system during fast run-in from 2.38 times to 1.17 times. Also, the oil temperature in the engine lubrication system decreases at the end of hot running under load by 1.15 times, from 433 K to 376 K. These studies confirm the assumption that the use of rolling oils with additives to accelerate running-in of rubbing surfaces has a positive effect not only on the alignment of the cylinder group, but also other critical friction pairs of the engine UMZ -421.