BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

14.21. Engine pollution

THE GENERAL DATA

In an operating time the engine and all its systems gradually become soiled even at correct operation and use of qualitative fuels-lubricants, not to mention the poor-quality. How to get rid of these stratifications?

For removal of resinous, varnish and other adjournment, deposits special solvents are necessary. Such preparations are studied and used already more than 70 years. The structure of solvents and cleaners can include mineral oil (kerosene, маловязкое oil, diesel fuel, easy gasoline), aromatic hydrocarbons (benzene, toluene, ксилол, naphthalene, a mix коксохимического manufactures), spirits (метанол, the ethanol, some higher spirits), хлорпродукты (хлорнафталин, хлордифенилоксид, four-chloric carbon, хлорбензол, дихлорэтан, etc.) Turpentine, этилацетат, acetone. Sometimes add нафтенат lead, стеарат the aluminium, some vegetative both animal oils and fats, acetic acid or its anhydride, ammoniac connections, etc. Structure of various solvents and cleaners неодинаков. The overwhelming majority of them has strong dissolving properties and, unfortunately, operate not only on adjournment, but also on polymers. Besides, they differ high toxicity and коррозийностью. Therefore it is necessary to choose carefully such products, using a professional advice.

The majority of solvents and cleaners are intended for separate units, systems, knots or details and are effective only at observance of corresponding technology of their use. Therefore to spend clearing by them follows, or separating these units or details, or in certain sequence. At first clear fuel system, then – oil as products of clearing of fuel system can get to oil. However, some firms suggest engine clearing to spend simultaneously, using the newest solvents.

After fast (5–10 minutes) clearings of fuel and oil system on HUNDRED for maintenance of cleanliness of the engine, prevention of accumulation of various deposits it is possible to use special "долгодействующие" solvents which periodically add in fuel and oil. Such solvents are intended for resinous substances and do not dissolve varnishes, deposits. For engine maintenance in cleanliness follows a thicket, than it is defined in characteristics sheet on service of cars, to replace oil. It is especially important. An operating time synthetic and минирального oils equally. At use of synthetic oil the engine, as a rule, becomes soiled less.

Now concerning some additives to oils which as advertising assures, "reduce deterioration of the engine, raising capacity and profitability". It is a question about антиизносных additives and additives (modifiers of a friction and металлоплакирующих additives). The essence of their action consists that they get into microcracks, forming on a surface of metal a film protecting from deterioration. At mechanical deterioration backlashes increase, pressure in oil system falls, the compression in cylinders decreases, fuel and engine oil expenses grow.

"Salutary" properties of lubricants into which structure are entered высокодиспергированные additives, are known for a long time. Input of metal additives in engine oils can really raise копрессия in cylinders and pressure in oil system at the expense of reduction of backlashes, вследствии that expenses of fuel and oil on burning out go down. The friction modifier to which belongs, for example, дисульфид molybdenum, simultaneously reduces friction factor a little.

Antiiznosnye additives and additives to oils for the worn out engines can be used, but to choose them it is necessary attentively not to damage to the engine. Not забывйте that noisy advertising becomes for this purpose, чтобя to sell the goods, despite its quality.