This oil film
In the crankcase of a vehicle engine, motor oil lubricates rotating or sliding surfaces between the crankshaft journal bearings (main bearings and big-end bearings), and rods connecting the pistons to the crankshaft. The oil collects in an oil pan, or sump, at the bottom of the crankcase. In some small engines such as lawn mower engines, dippers on the bottoms of connecting rods dip into the oil at the bottom and splash it around the crankcase as needed to lubricate parts inside. In modern vehicle engines, the oil pump takes oil from the oil pan and sends it through the oil filter into oil galleries, from which the oil lubricates the main bearings holding the crankshaft up at the main journals and camshaft bearings operating the valves. In typical modern vehicles, oil pressure-fed from the oil galleries to the main bearings enters holes in the main journals of the crankshaft. From these holes in the main journals, the oil moves through passageways inside the crankshaft to exit holes in the rod journals to lubricate the rod bearings and connecting rods. Some simpler designs relied on these rapidly moving parts to splash and lubricate the contacting surfaces between the piston rings and interior surfaces of the cylinders. However, in modern designs, there are also passageways through the rods which carry oil from the rod bearings to the rod-piston connections and lubricate the contacting surfaces between the piston rings and interior surfaces of the cylinders. This oil film also serves as a seal between the piston rings and cylinder walls to separate the combustion chamber in the cylinder head from the crankcase. The oil then drips back down into the oil pan.45
Motor oil may also serve as a cooling agent. In some constructions oil is sprayed through a nozzle inside the crankcase onto the piston to provide cooling of specific parts that undergo high temperature strain. On the other hand, the thermal capacity of the oil pool has to be filled, i.e. the oil has to reach its designed temperature range before it can protect the engine under high load. This typically takes longer than heating the main cooling agent ? water or mixtures thereof ? up to its operating temperature. In order to inform the driver about the oil temperature, some older and most high performance or racing engines feature an oil thermometer.
Due to its high viscosity, motor oil is not always the preferred oil for certain applications. Some applications make use of lighter products such as WD-40, when a lighter oil is desired, or honing oil if the desired viscosity needs to be mid-range.6
Breakdown city bus
City bus can be approved for use by the city after a thorough check its technical condition, it must be not only efficient, but also to meet all the standards required for vehicles to carry passengers on the urban areas. The most important will always be the safety and comfort of passengers, for which you need to take care of before a vehicle is moving, and in the course of passenger transport. Repairing city bus it will be made after finding in it the existence of any defects that might jeopardize the safety of passengers. On the other hand, making such activities as engine oil or brake, may belong to the same driver or service personnel.
The problem of finding car parts
If we have a very rare car certainly our car can be the object of envy from friends, family or even strangers. Often, however, it can happen that a limited edition produced cars very hard to find the right car parts. Currently the easiest special parts can be found for example on the Internet, due to the fact that recently there are extremely many sites advertising of this kind offers. The problem may also occur with the installation of such parts, because not every mechanic to take orders for all cars. Such problems are best to consider when choosing a car already.