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History 1
History 2
History 3
History 4
History 5
History 6
History 7
History 8
History 9

Lubrication 1
Lubrication 2
Lubrication 3 - Oil
Lubrication 4 - Engine Oil
Lubrication 5 - Additives
Lubrication 6 - Oil Filter 1
Lubrication 7 - Oil Filter 2
Lubrication 8 - Oil Change?
Lubrication 9 - Centrifuge
Lubrication 10 - Oil Level
Lubrication 11 - Press. Circulation
Lubrication 12 - Dry Sump
Lubrication 13 - Oil Pump
Lubrication 14 - Gear Pump
Lubrication 15 - Crescent Pump
Lubrication 16 - Rotor Pump
Lubrication 17 - Ventilation
Lubrication 18 - Oil Sump
Lubrication 19 - Oil Separation
Lubrication 20 - Viscosity
Lubrication 21 - Oil Cooling
Heat Exchanger
Gearbox Oil
Transmission Lubrication
Shaft sealing-ring
Seal - Gasket
Lubrication 27 - Circulation

Lubrication 1
Lubrication 2
Lubrication 3
Lubrication 4
Lubrication 5
Lubrication 6
Lubrication 7
Lubrication 8
Lubrication 9
Lubrication 10
Lubrication 11
Lubrication 12
Lubrication 13
Lubrication 14
Lubrication 15

Lubrication 21 - Oil Cooling

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No liquid medium used in the automobile reaches higher temperatures than the engine oil. The pictures show appropriate coolers from the past and the present. In the past it was considered especially sporty to place oil-air heat exchangers in front, under the bumper, as with the NSU TT (picture 1). Whereby, the long tube connections from the rear-mounted engine presented a relatively high risk, even if they were additionally armour-plated. Nowadays the oil cooling is integrated near the component to be cooled (picture 2). More often, however, the oil cooling is done by an oil coolant heat exchanger.

How it works

Circling heat affected parts, the oil absorbs heat from, e.g., the piston oil-spray cooling in the case of charged motors or the torque converter as in the automatic gearbox. Generally the circulation is taken care of by the oil pump, in rare cases the oil can be also thrown by spoon-shaped recesses in the gearwheels and thus be transported through pipelines and coolers. A thermostat switches the oil cooler on or off when the maximum or minimum temperature is reached, this is very important with e.g. air-cooled engines. Pump circulation maintenance is important, the pipelines should be checked at regular intervals. Leakage or abrasion of pipelines under pressure can have fatal results for the environment and/or for the aggregates to be cooled.

With lower performance engines the normal heat exchange through the oil sump is improved by:
- the choice of special materials (e.g. aluminium),
- the presence of cooling fins,
- a special oil guidance which prevents the hot oil from being redirected into the process immediately again.
Instead of an oil-air heat exchanger an oil-coolant heat exchanger can be integrated into the oil circulation. In this case, the faster heating coolant delivers warmth to the oil during the cold running phase. The reverse process is possible in the event of higher demands on the engine. 06/08

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