Marius Toma

Investigating Maintenance Procedures for Engine Air Filters

Most vehicles in operation are equipped with air filters made of cellulose fiber. Dust particles that are not retained by the air filter reach inside the engine, intensifying its wear. The air filter condition affects economic performance, power and reliability of the internal combustion engine. Properly maintenance of the air filters positively affects engine durability and reduces maintenance costs. The air filter condition is assessed by the restriction generated. This paper investigates to what extent the air filters replaced according to the maintenance schedule recommended by the manufacturer (depending on the distance traveled by the vehicle while using the air filter or the operating time of the air filter) were replaced at the appropriate time. Restriction values generated by seven types of new and used air filter are being presented. The results show that replacing filters according to the maintenance manual and repair is made in most cases prematurely or too late. The paper also draws attention on the default mounting of the air filter that could lead to its damage and consequently allowing unfiltered air entering the engine.

Some Aspects Concerning the Period of Automotive Air Filters Replacement on the Basis of their Technical Conditions

The engine air supply system is the main source through which impurities from the atmosphere reach inside the kinematic couplings of the engine. The engine protection is ensured by periodically replacement of the air filters. Determining air filters service life is a difficult problem due to different operation conditions of the vehicles. Therefore, air filters are frequently replaced more often than necessary on the principle that a new filter is better than a replaced one. The present paper aims to determine if the air filters replaced during the preventive maintenance activities have reached the end of their service life or they could still be used. The research is based on measuring the pressure restriction and estimating the mass of dust collected by the air filters.

Comparative Study on the Regeneration of Used Motor Oil

Waste oil is a source of global pollution, both in terms of the amount generated and the environmental toxicity. The used motor oils are contaminated by contaminants and impurities resulted from undesirable oxidation processes: sediment, water, metallic particles and degraded additives.

Automotive Engine Air Filters Testing on a Specialized Rig Using Controlled Dust Loading

In order to better protect the engine, air filters with high efficiency should be used as well as appropriate maintenance activities. Maintenance activity must take into account the behaviour of the air filters during exploitation, namely the increases of the gaso-dynamic resistances they produce while air filters are used. This paper presents the variation of the pressure restriction depending on the amount of dust retained by the air filters and also the storage capacity of dust by the air filters. Filters are loaded on a laboratory rig with dust from the roads of Bucharest.